What’s Vulnerable › Vulnerabilities

CVE-2024-44986: ipv6: fix possible UAF in ip6_finish_output2()

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-09-04 · updated 2026-09-29
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: fix possible UAF in ip6_finish_output2() If skb_expand_head() returns NULL, skb has been freed and associated dst/idev could also have been freed. We need to hold rcu_read_lock() to make sure the dst and associated idev are alive.

Affected products

• Debian Linux: 11.0
• Linux kernel: from 5.4.137 before 5.4.289; from 5.10.55 before 5.10.233; from 5.13.7 before 5.15.166; from 5.16 before 6.1.107; from 6.2 before 6.6.48; from 6.7 before 6.10.7 — fixed in 5.10.233, 5.15.166, 5.4.289, 6.1.107, 6.10.7, 6.6.48

How to fix

Upgrade to a fixed version: Linux kernel 5.10.233, 5.15.166, 5.4.289, 6.1.107. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1504108cb6020df7b1a31c9bb80fd587470aa448
• https://git.kernel.org/stable/c/3574d28caf9a09756ae87ad1ea096c6f47b6101e
• https://git.kernel.org/stable/c/56efc253196751ece1fc535a5b582be127b0578a
• https://git.kernel.org/stable/c/6ab6bf731354a6fdbaa617d1ec194960db61cf3b
• https://git.kernel.org/stable/c/ae8512e93f4ce47614ca89defaec1b93e00697b8
• https://git.kernel.org/stable/c/da273b377ae0d9bd255281ed3c2adb228321687b
• https://git.kernel.org/stable/c/e891b36de161fcd96f12ff83667473e5067b9037
• https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

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