CVE-2022-49561: netfilter: conntrack: re-fetch conntrack after insertion

Published Feb 26, 2025
·
Updated

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

netfilter: conntrack: re-fetch conntrack after insertion

In case the conntrack is clashing, insertion can free skb->nfct and set skb->nfct to the already-confirmed entry.

This wasn't found before because the conntrack entry and the extension space used to free'd after an rcu grace period, plus the race needs events enabled to trigger.

Affected Software

158 affected componentsFixes available
Linux Linux kernel
Linux Linux kernel>=4.7<4.14.282
Linux Linux kernel>=4.15<4.19.246
Linux Linux kernel>=4.20<5.4.197
Linux Linux kernel>=5.5<5.10.120
Linux Linux kernel>=5.11<5.15.45
Linux Linux kernel>=5.16<5.17.13
Linux Linux kernel>=5.18<5.18.2
debian/linux<5.18.2-1
5.18.2-1
debian/linux<5.18.2-1
5.18.2-1
debian/linux<5.18.2-1
5.18.2-1
debian/linux
6.1.176-16.1.190-16.12.107-16.12.115-27.2.12-17.2.15-1
ubuntu/linux-azure<4.15.0-1149.164~14.04.1
4.15.0-1149.164~14.04.1
ubuntu/linux-aws-hwe<4.15.0-1139.150~16.04.1
4.15.0-1139.150~16.04.1
ubuntu/linux-azure<4.15.0-1149.164~16.04.1
4.15.0-1149.164~16.04.1
ubuntu/linux-gcp<4.15.0-1134.150~16.04.2
4.15.0-1134.150~16.04.2
ubuntu/linux-hwe<4.15.0-191.202~16.04.1
4.15.0-191.202~16.04.1
ubuntu/linux-oracle<4.15.0-1104.115~16.04.1
4.15.0-1104.115~16.04.1
ubuntu/linux-hwe-edge*
ubuntu/linux<4.15.0-191.202
4.15.0-191.202
ubuntu/linux-aws<4.15.0-1139.150
4.15.0-1139.150
ubuntu/linux-aws-5.4<5.4.0-1085.92~18.04.1
5.4.0-1085.92~18.04.1
ubuntu/linux-azure-4.15<4.15.0-1149.164
4.15.0-1149.164
ubuntu/linux-azure-5.4<5.4.0-1091.96~18.04.1
5.4.0-1091.96~18.04.1
ubuntu/linux-gcp-4.15<4.15.0-1134.150
4.15.0-1134.150
ubuntu/linux-gcp-5.4<5.4.0-1089.97~18.04.1
5.4.0-1089.97~18.04.1
ubuntu/linux-hwe-5.4<5.4.0-126.142~18.04.1
5.4.0-126.142~18.04.1
ubuntu/linux-ibm-5.4<5.4.0-1033.37~18.04.1
5.4.0-1033.37~18.04.1
ubuntu/linux-kvm<4.15.0-1125.130
4.15.0-1125.130
ubuntu/linux-oracle<4.15.0-1104.115
4.15.0-1104.115
ubuntu/linux-oracle-5.4<5.4.0-1083.91~18.04.1
5.4.0-1083.91~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1070.80~18.04.1
5.4.0-1070.80~18.04.1
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-aws-fips<4.15.0-2078.83
4.15.0-2078.83
ubuntu/linux-azure-fips<4.15.0-2059.65
4.15.0-2059.65
ubuntu/linux-fips<4.15.0-1096.107
4.15.0-1096.107
ubuntu/linux-gcp-fips<4.15.0-2043.48
4.15.0-2043.48
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.4.0-126.142
5.4.0-126.142
ubuntu/linux-aws<5.4.0-1085.92
5.4.0-1085.92
ubuntu/linux-aws-5.15<5.15.0-1019.23~20.04.1
5.15.0-1019.23~20.04.1
ubuntu/linux-azure<5.4.0-1091.96
5.4.0-1091.96
ubuntu/linux-azure-5.15<5.15.0-1019.24~20.04.1
5.15.0-1019.24~20.04.1
ubuntu/linux-bluefield<5.4.0-1046.51
5.4.0-1046.51
ubuntu/linux-gcp<5.4.0-1089.97
5.4.0-1089.97
ubuntu/linux-gcp-5.15<5.15.0-1017.23~20.04.2
5.15.0-1017.23~20.04.2
ubuntu/linux-hwe-5.15<5.15.0-48.54~20.04.1
5.15.0-48.54~20.04.1
ubuntu/linux-ibm<5.4.0-1033.37
5.4.0-1033.37
ubuntu/linux-intel-iotg-5.15<5.15.0-1015.20~20.04.2
5.15.0-1015.20~20.04.2
ubuntu/linux-iot<5.4.0-1004.6
5.4.0-1004.6
ubuntu/linux-kvm<5.4.0-1075.80
5.4.0-1075.80
ubuntu/linux-lowlatency-hwe-5.15<5.15.0-48.54~20.04.1
5.15.0-48.54~20.04.1
ubuntu/linux-oracle<5.4.0-1083.91
5.4.0-1083.91
ubuntu/linux-oracle-5.15<5.15.0-1017.22~20.04.1
5.15.0-1017.22~20.04.1
ubuntu/linux-raspi<5.4.0-1070.80
5.4.0-1070.80
ubuntu/linux-riscv-5.15<5.15.0-1018.21~20.04.1
5.15.0-1018.21~20.04.1
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<5.4.0-1085.92+fips1
5.4.0-1085.92+fips1
ubuntu/linux-azure-fips<5.4.0-1091.96+fips1
5.4.0-1091.96+fips1
ubuntu/linux-fips<5.4.0-1061.69
5.4.0-1061.69
ubuntu/linux-gcp-fips<5.4.0-1089.97+fips1
5.4.0-1089.97+fips1
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.15.0-47.51
5.15.0-47.51
ubuntu/linux-allwinner-5.19*
ubuntu/linux-aws<5.15.0-1019.23
5.15.0-1019.23
ubuntu/linux-aws-5.19*
ubuntu/linux-aws-6.2*
ubuntu/linux-aws-6.5*
ubuntu/linux-azure<5.15.0-1019.24
5.15.0-1019.24
ubuntu/linux-azure-5.19*
ubuntu/linux-azure-6.2*
ubuntu/linux-azure-6.5*
ubuntu/linux-azure-fde-5.19*
ubuntu/linux-azure-fde-6.2*
ubuntu/linux-gcp<5.15.0-1017.23
5.15.0-1017.23
ubuntu/linux-gcp-5.19*
ubuntu/linux-gcp-6.2*
ubuntu/linux-gcp-6.5*
ubuntu/linux-gke<5.15.0-1015.18
5.15.0-1015.18
ubuntu/linux-gkeop<5.15.0-1002.4
5.15.0-1002.4
ubuntu/linux-hwe-5.19*
ubuntu/linux-hwe-6.2*
ubuntu/linux-hwe-6.5*
ubuntu/linux-ibm<5.15.0-1013.15
5.15.0-1013.15
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-intel-iotg<5.15.0-1015.20
5.15.0-1015.20
ubuntu/linux-kvm<5.15.0-1017.21
5.15.0-1017.21
ubuntu/linux-lowlatency<5.15.0-47.53
5.15.0-47.53
ubuntu/linux-lowlatency-hwe-5.19*
ubuntu/linux-lowlatency-hwe-6.2*
ubuntu/linux-lowlatency-hwe-6.5*
ubuntu/linux-nvidia<5.15.0-1007.7
5.15.0-1007.7
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<5.15.0-1017.22
5.15.0-1017.22
ubuntu/linux-oracle-6.5*
ubuntu/linux-raspi<5.15.0-1014.16
5.15.0-1014.16
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-realtime<5.15.0-1020.20
5.15.0-1020.20
ubuntu/linux-raspi-realtime*
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 5.18.2-1
  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-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1149.164~14.04.1
  4. Upgrade

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

    Fixed in 4.15.0-1139.150~16.04.1
  5. Upgrade

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

    Fixed in 4.15.0-1149.164~16.04.1
  6. Upgrade

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

    Fixed in 4.15.0-1134.150~16.04.2
  7. Upgrade

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

    Fixed in 4.15.0-191.202~16.04.1
  8. Upgrade

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

    Fixed in 4.15.0-1104.115~16.04.1
  9. Upgrade

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

    Fixed in 4.15.0-191.202
  10. Upgrade

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

    Fixed in 4.15.0-1139.150
  11. Upgrade

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

    Fixed in 5.4.0-1085.92~18.04.1
  12. Upgrade

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

    Fixed in 4.15.0-1149.164
  13. Upgrade

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

    Fixed in 5.4.0-1091.96~18.04.1
  14. Upgrade

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

    Fixed in 4.15.0-1134.150
  15. Upgrade

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

    Fixed in 5.4.0-1089.97~18.04.1
  16. Upgrade

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

    Fixed in 5.4.0-126.142~18.04.1
  17. Upgrade

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

    Fixed in 5.4.0-1033.37~18.04.1
  18. Upgrade

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

    Fixed in 4.15.0-1125.130
  19. Upgrade

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

    Fixed in 4.15.0-1104.115
  20. Upgrade

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

    Fixed in 5.4.0-1083.91~18.04.1
  21. Upgrade

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

    Fixed in 5.4.0-1070.80~18.04.1
  22. Upgrade

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

    Fixed in 4.15.0-2078.83
  23. Upgrade

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

    Fixed in 4.15.0-2059.65
  24. Upgrade

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

    Fixed in 4.15.0-1096.107
  25. Upgrade

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

    Fixed in 4.15.0-2043.48
  26. Upgrade

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

    Fixed in 5.4.0-126.142
  27. Upgrade

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

    Fixed in 5.4.0-1085.92
  28. Upgrade

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

    Fixed in 5.15.0-1019.23~20.04.1
  29. Upgrade

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

    Fixed in 5.4.0-1091.96
  30. Upgrade

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

    Fixed in 5.15.0-1019.24~20.04.1
  31. Upgrade

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

    Fixed in 5.4.0-1046.51
  32. Upgrade

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

    Fixed in 5.4.0-1089.97
  33. Upgrade

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

    Fixed in 5.15.0-1017.23~20.04.2
  34. Upgrade

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

    Fixed in 5.15.0-48.54~20.04.1
  35. Upgrade

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

    Fixed in 5.4.0-1033.37
  36. Upgrade

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

    Fixed in 5.15.0-1015.20~20.04.2
  37. Upgrade

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

    Fixed in 5.4.0-1004.6
  38. Upgrade

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

    Fixed in 5.4.0-1075.80
  39. Upgrade

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

    Fixed in 5.15.0-48.54~20.04.1
  40. Upgrade

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

    Fixed in 5.4.0-1083.91
  41. Upgrade

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

    Fixed in 5.15.0-1017.22~20.04.1
  42. Upgrade

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

    Fixed in 5.4.0-1070.80
  43. Upgrade

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

    Fixed in 5.15.0-1018.21~20.04.1
  44. Upgrade

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

    Fixed in 5.4.0-1085.92+fips1
  45. Upgrade

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

    Fixed in 5.4.0-1091.96+fips1
  46. Upgrade

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

    Fixed in 5.4.0-1061.69
  47. Upgrade

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

    Fixed in 5.4.0-1089.97+fips1
  48. Upgrade

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

    Fixed in 5.15.0-47.51
  49. Upgrade

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

    Fixed in 5.15.0-1019.23
  50. Upgrade

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

    Fixed in 5.15.0-1019.24
  51. Upgrade

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

    Fixed in 5.15.0-1017.23
  52. Upgrade

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

    Fixed in 5.15.0-1015.18
  53. Upgrade

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

    Fixed in 5.15.0-1002.4
  54. Upgrade

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

    Fixed in 5.15.0-1013.15
  55. Upgrade

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

    Fixed in 5.15.0-1015.20
  56. Upgrade

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

    Fixed in 5.15.0-1017.21
  57. Upgrade

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

    Fixed in 5.15.0-47.53
  58. Upgrade

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

    Fixed in 5.15.0-1007.7
  59. Upgrade

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

    Fixed in 5.15.0-1017.22
  60. Upgrade

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

    Fixed in 5.15.0-1014.16
  61. Upgrade

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

    Fixed in 5.15.0-1020.20

Event History

Feb 26, 2025
CVE Published
via MITRE·02:14 AM
Data Sourced
via MITRE·02:14 AM
DescriptionSeverity
Data Sourced
via OSV·07:01 AM
DescriptionSeverityAffected Software
Data Sourced
via NVD·07:01 AM
RemedyDescriptionSeverityAffected Software

Frequently Asked Questions

1

What is the severity of CVE-2022-49561?

CVE-2022-49561 has been classified with a severity rating that indicates it could potentially allow for privilege escalation due to mishandling of conntrack entries.

2

How do I fix CVE-2022-49561?

To fix CVE-2022-49561, update your Linux kernel to a version that includes the relevant patches beyond the affected versions.

3

What versions of the Linux kernel are affected by CVE-2022-49561?

CVE-2022-49561 affects Linux kernel versions from 4.7 to 5.18.2, excluding patched releases.

4

What is the impact of CVE-2022-49561 on Linux systems?

CVE-2022-49561 may lead to improper handling of network packets, potentially allowing attackers to bypass security mechanisms.

5

Has CVE-2022-49561 been resolved?

Yes, CVE-2022-49561 has been resolved in subsequent kernel releases where the vulnerability has been patched.

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