CVE-2022-50531: tipc: fix an information leak in tipc_topsrv_kern_subscr

Published Oct 7, 2025
·
Updated

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

tipc: fix an information leak in tipctopsrvkernsubscr

Use a 8-byte write to initialize sub.usrhandle in tipctopsrvkernsubscr(), otherwise four bytes remain uninitialized when issuing setsockopt(..., SOLTIPC, ...). This resulted in an infoleak reported by KMSAN when the packet was received:

===================================================== BUG: KMSAN: kernel-infoleak in copyout+0xbc/0x100 lib/ioviter.c:169 instrumentcopytouser ./include/linux/instrumented.h:121 copyout+0xbc/0x100 lib/ioviter.c:169 copytoiter+0x5c0/0x20a0 lib/ioviter.c:527 copytoiter ./include/linux/uio.h:176 simplecopytoiter+0x64/0xa0 net/core/datagram.c:513 skbdatagramiter+0x123/0xdc0 net/core/datagram.c:419 skbcopydatagramiter+0x58/0x200 net/core/datagram.c:527 skbcopydatagrammsg ./include/linux/skbuff.h:3903 packetrecvmsg+0x521/0x1e70 net/packet/afpacket.c:3469 sysrecvmsg+0x2c4/0x810 net/socket.c:? sysrecvmsg+0x217/0x840 net/socket.c:2743 sysrecvmsg net/socket.c:2773 dosysrecvmsg net/socket.c:2783 sesysrecvmsg net/socket.c:2780 x64sysrecvmsg+0x364/0x540 net/socket.c:2780 dosyscallx64 arch/x86/entry/common.c:50 dosyscall64+0x3d/0xb0 arch/x86/entry/common.c:80 entrySYSCALL64afterhwframe+0x63/0xcd arch/x86/entry/entry64.S:120

...

Uninit was stored to memory at: tipcsubsubscribe+0x42d/0xb50 net/tipc/subscr.c:156 tipcconnrcvsub+0x246/0x620 net/tipc/topsrv.c:375 tipctopsrvkernsubscr+0x2e8/0x400 net/tipc/topsrv.c:579 tipcgroupcreate+0x4e7/0x7d0 net/tipc/group.c:190 tipcskjoin+0x2a8/0x770 net/tipc/socket.c:3084 tipcsetsockopt+0xae5/0xe40 net/tipc/socket.c:3201 syssetsockopt+0x87f/0xdc0 net/socket.c:2252 dosyssetsockopt net/socket.c:2263 sesyssetsockopt net/socket.c:2260 x64syssetsockopt+0xe0/0x160 net/socket.c:2260 dosyscallx64 arch/x86/entry/common.c:50 dosyscall64+0x3d/0xb0 arch/x86/entry/common.c:80 entrySYSCALL64afterhwframe+0x63/0xcd arch/x86/entry/entry64.S:120

Local variable sub created at: tipctopsrvkernsubscr+0x57/0x400 net/tipc/topsrv.c:562 tipcgroupcreate+0x4e7/0x7d0 net/tipc/group.c:190

Bytes 84-87 of 88 are uninitialized Memory access of size 88 starts at ffff88801ed57cd0 Data copied to user address 0000000020000400 ... =====================================================

Affected Software

148 affected componentsFixes available
Linux Kernel
Linux Linux kernel>=4.17<4.19.264
Linux Linux kernel>=4.20<5.4.221
Linux Linux kernel>=5.5<5.10.152
Linux Linux kernel>=5.11<5.15.76
Linux Linux kernel>=5.16<6.0.6
Linux Linux kernel=6.1-rc1
debian/linux<6.0.6-1
6.0.6-1
debian/linux<6.0.6-1
6.0.6-1
debian/linux<6.0.6-1
6.0.6-1
debian/linux
6.1.176-16.1.190-16.12.107-16.12.115-27.2.12-17.2.15-1
ubuntu/linux-hwe-edge*
ubuntu/linux-aws-5.4<5.4.0-1096.104~18.04.1
5.4.0-1096.104~18.04.1
ubuntu/linux-azure-5.4<5.4.0-1103.109~18.04.1
5.4.0-1103.109~18.04.1
ubuntu/linux-gcp-5.4<5.4.0-1100.109~18.04.1
5.4.0-1100.109~18.04.1
ubuntu/linux-hwe-5.4<5.4.0-139.156~18.04.1
5.4.0-139.156~18.04.1
ubuntu/linux-ibm-5.4<5.4.0-1044.49~18.04.1
5.4.0-1044.49~18.04.1
ubuntu/linux-oracle-5.4<5.4.0-1093.102~18.04.1
5.4.0-1093.102~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1080.91~18.04.1
5.4.0-1080.91~18.04.1
ubuntu/linux-aws-5.0*
ubuntu/linux-aws-5.3*
ubuntu/linux-azure*
ubuntu/linux-azure-5.3*
ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
ubuntu/linux-gcp-5.3*
ubuntu/linux-gke-4.15*
ubuntu/linux-gke-5.4*
ubuntu/linux-gkeop-5.4*
ubuntu/linux-hwe*
ubuntu/linux-hwe-edge*
ubuntu/linux-oem*
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux<5.4.0-139.156
5.4.0-139.156
ubuntu/linux-aws<5.4.0-1096.104
5.4.0-1096.104
ubuntu/linux-aws-5.15<5.15.0-1030.34~20.04.1
5.15.0-1030.34~20.04.1
ubuntu/linux-azure<5.4.0-1103.109
5.4.0-1103.109
ubuntu/linux-azure-5.15<5.15.0-1033.40~20.04.1
5.15.0-1033.40~20.04.1
ubuntu/linux-bluefield<5.4.0-1058.64
5.4.0-1058.64
ubuntu/linux-gcp<5.4.0-1100.109
5.4.0-1100.109
ubuntu/linux-gcp-5.15<5.15.0-1029.36~20.04.1
5.15.0-1029.36~20.04.1
ubuntu/linux-hwe-5.15<5.15.0-60.66~20.04.1
5.15.0-60.66~20.04.1
ubuntu/linux-ibm<5.4.0-1044.49
5.4.0-1044.49
ubuntu/linux-intel-iotg-5.15<5.15.0-1025.30~20.04.1
5.15.0-1025.30~20.04.1
ubuntu/linux-iot<5.4.0-1012.14
5.4.0-1012.14
ubuntu/linux-kvm<5.4.0-1086.92
5.4.0-1086.92
ubuntu/linux-lowlatency-hwe-5.15<5.15.0-60.66~20.04.1
5.15.0-60.66~20.04.1
ubuntu/linux-oracle<5.4.0-1093.102
5.4.0-1093.102
ubuntu/linux-oracle-5.15<5.15.0-1029.35~20.04.1
5.15.0-1029.35~20.04.1
ubuntu/linux-raspi<5.4.0-1080.91
5.4.0-1080.91
ubuntu/linux-riscv-5.15<5.15.0-1029.33~20.04.1
5.15.0-1029.33~20.04.1
ubuntu/linux-xilinx-zynqmp<5.4.0-1021.25
5.4.0-1021.25
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-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<5.4.0-1096.104+fips1
5.4.0-1096.104+fips1
ubuntu/linux-azure-fips<5.4.0-1103.109+fips1
5.4.0-1103.109+fips1
ubuntu/linux-fips<5.4.0-1072.81
5.4.0-1072.81
ubuntu/linux-gcp-fips<5.4.0-1100.109+fips1
5.4.0-1100.109+fips1
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.15.0-60.66
5.15.0-60.66
ubuntu/linux-allwinner-5.19*
ubuntu/linux-aws<5.15.0-1030.34
5.15.0-1030.34
ubuntu/linux-aws-5.19*
ubuntu/linux-aws-6.2*
ubuntu/linux-aws-6.5*
ubuntu/linux-azure<5.15.0-1033.40
5.15.0-1033.40
ubuntu/linux-azure-5.19*
ubuntu/linux-azure-6.2*
ubuntu/linux-azure-6.5*
ubuntu/linux-azure-fde<5.15.0-1033.40.1
5.15.0-1033.40.1
ubuntu/linux-azure-fde-5.19*
ubuntu/linux-azure-fde-6.2*
ubuntu/linux-gcp<5.15.0-1029.36
5.15.0-1029.36
ubuntu/linux-gcp-5.19*
ubuntu/linux-gcp-6.2*
ubuntu/linux-gcp-6.5*
ubuntu/linux-gke<5.15.0-1027.32
5.15.0-1027.32
ubuntu/linux-gkeop<5.15.0-1015.19
5.15.0-1015.19
ubuntu/linux-hwe-5.19*
ubuntu/linux-hwe-6.2*
ubuntu/linux-hwe-6.5*
ubuntu/linux-ibm<5.15.0-1025.28
5.15.0-1025.28
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-intel-iotg<5.15.0-1025.30
5.15.0-1025.30
ubuntu/linux-kvm<5.15.0-1028.33
5.15.0-1028.33
ubuntu/linux-lowlatency<5.15.0-60.66
5.15.0-60.66
ubuntu/linux-lowlatency-hwe-5.19*
ubuntu/linux-lowlatency-hwe-6.2*
ubuntu/linux-lowlatency-hwe-6.5*
ubuntu/linux-nvidia<5.15.0-1017.17
5.15.0-1017.17
ubuntu/linux-nvidia-6.2*
ubuntu/linux-nvidia-6.5*
ubuntu/linux-oem-5.17*
ubuntu/linux-oem-6.0*
ubuntu/linux-oem-6.1*
ubuntu/linux-oem-6.5*
ubuntu/linux-oracle<5.15.0-1029.35
5.15.0-1029.35
ubuntu/linux-oracle-6.5*
ubuntu/linux-raspi<5.15.0-1024.26
5.15.0-1024.26
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.19*
ubuntu/linux-riscv-6.5*
ubuntu/linux-starfive-5.19*
ubuntu/linux-starfive-6.2*
ubuntu/linux-starfive-6.5*
ubuntu/linux-bluefield<5.15.0-1014.16
5.15.0-1014.16
ubuntu/linux-azure-6.11*
ubuntu/linux-gcp-6.11*
ubuntu/linux-hwe-6.11*
ubuntu/linux-intel*
ubuntu/linux-lowlatency-hwe-6.11*
ubuntu/linux-oem-6.11*
ubuntu/linux-oem-6.8*
ubuntu/linux-raspi-realtime*
ubuntu/linux-realtime*
ubuntu/linux-riscv*
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 6.0.6-1
  2. Upgrade

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

    Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.115-2Fixed in 7.2.12-1Fixed in 7.2.15-1
  3. Upgrade

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

    Fixed in 5.4.0-1096.104~18.04.1
  4. Upgrade

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

    Fixed in 5.4.0-1103.109~18.04.1
  5. Upgrade

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

    Fixed in 5.4.0-1100.109~18.04.1
  6. Upgrade

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

    Fixed in 5.4.0-139.156~18.04.1
  7. Upgrade

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

    Fixed in 5.4.0-1044.49~18.04.1
  8. Upgrade

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

    Fixed in 5.4.0-1093.102~18.04.1
  9. Upgrade

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

    Fixed in 5.4.0-1080.91~18.04.1
  10. Upgrade

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

    Fixed in 5.4.0-139.156
  11. Upgrade

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

    Fixed in 5.4.0-1096.104
  12. Upgrade

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

    Fixed in 5.15.0-1030.34~20.04.1
  13. Upgrade

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

    Fixed in 5.4.0-1103.109
  14. Upgrade

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

    Fixed in 5.15.0-1033.40~20.04.1
  15. Upgrade

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

    Fixed in 5.4.0-1058.64
  16. Upgrade

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

    Fixed in 5.4.0-1100.109
  17. Upgrade

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

    Fixed in 5.15.0-1029.36~20.04.1
  18. Upgrade

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

    Fixed in 5.15.0-60.66~20.04.1
  19. Upgrade

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

    Fixed in 5.4.0-1044.49
  20. Upgrade

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

    Fixed in 5.15.0-1025.30~20.04.1
  21. Upgrade

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

    Fixed in 5.4.0-1012.14
  22. Upgrade

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

    Fixed in 5.4.0-1086.92
  23. Upgrade

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

    Fixed in 5.15.0-60.66~20.04.1
  24. Upgrade

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

    Fixed in 5.4.0-1093.102
  25. Upgrade

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

    Fixed in 5.15.0-1029.35~20.04.1
  26. Upgrade

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

    Fixed in 5.4.0-1080.91
  27. Upgrade

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

    Fixed in 5.15.0-1029.33~20.04.1
  28. Upgrade

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

    Fixed in 5.4.0-1021.25
  29. Upgrade

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

    Fixed in 5.4.0-1096.104+fips1
  30. Upgrade

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

    Fixed in 5.4.0-1103.109+fips1
  31. Upgrade

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

    Fixed in 5.4.0-1072.81
  32. Upgrade

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

    Fixed in 5.4.0-1100.109+fips1
  33. Upgrade

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

    Fixed in 5.15.0-60.66
  34. Upgrade

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

    Fixed in 5.15.0-1030.34
  35. Upgrade

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

    Fixed in 5.15.0-1033.40
  36. Upgrade

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

    Fixed in 5.15.0-1033.40.1
  37. Upgrade

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

    Fixed in 5.15.0-1029.36
  38. Upgrade

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

    Fixed in 5.15.0-1027.32
  39. Upgrade

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

    Fixed in 5.15.0-1015.19
  40. Upgrade

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

    Fixed in 5.15.0-1025.28
  41. Upgrade

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

    Fixed in 5.15.0-1025.30
  42. Upgrade

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

    Fixed in 5.15.0-1028.33
  43. Upgrade

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

    Fixed in 5.15.0-60.66
  44. Upgrade

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

    Fixed in 5.15.0-1017.17
  45. Upgrade

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

    Fixed in 5.15.0-1029.35
  46. Upgrade

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

    Fixed in 5.15.0-1024.26
  47. Upgrade

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

    Fixed in 5.15.0-1014.16
  48. Compensating control

    In the Linux kernel TIPC implementation, update tipc_topsrv_kern_subscr() to use an 8-byte write to initialize sub.usr_handle, preventing four bytes from remaining uninitialized when issuing setsockopt(..., SOL_TIPC, ...).

Event History

Oct 7, 2025
CVE Published
via MITRE·03:19 PM
Data Sourced
via MITRE·03:19 PM
Description
Data Sourced
via OSV·04:15 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·04:15 PM
RemedyDescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

1

What is the severity of CVE-2022-50531?

CVE-2022-50531 has a severity rating that reflects its potential impact on information leakage within the Linux kernel.

2

How do I fix CVE-2022-50531?

To fix CVE-2022-50531, ensure you are running an updated Linux kernel version that has addressed this vulnerability.

3

What are the affected versions for CVE-2022-50531?

CVE-2022-50531 affects multiple versions of the Linux kernel, specifically those between 4.17 and 6.1-rc1.

4

What kind of vulnerability is CVE-2022-50531?

CVE-2022-50531 is classified as an information leak vulnerability in the Linux kernel's tipc component.

5

Is CVE-2022-50531 present in the latest Linux kernel?

The latest stable versions of the Linux kernel contain patches that mitigate the effects of CVE-2022-50531.

Company

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