CVE-2024-36971net: fix __dst_negative_advice() race
Updated under an hour ago ()
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It affects Linux and 2 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Aug 7, 2024; federal agencies had to remediate by Aug 28, 2024. Treat that date as your deadline.
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In the Linux kernel, the following vulnerability has been resolved: net: fix __dst_negative_advice() race __dst_negative_advice() does not enforce proper RCU rules when sk->dst_cache must be cleared, leading to possible UAF. RCU rules are that we must first clear sk->sk_dst_cache, then call dst_release(old_dst). Note that sk_dst_reset(sk) is implementing this protocol correctly, while __dst_negative_advice() uses the wrong order. Given that ip6_negative_advice() has special logic against RTF_CACHE, this means each of the three ->negative_advice() existing methods must perform the sk_dst_reset() themselves. Note the check against NULL dst is centralized in __dst_negative_advice(), there is no need to duplicate it in various callbacks. Many thanks to Clement Lecigne for tracking this issue. This old bug became visible after the blamed commit, using UDP sockets.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-416
- Known exploited
- Added to CISA KEV Aug 7, 2024; federal remediation due Aug 28, 2024Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 2.70% (percentile 86)
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Aug 5, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 before 051c0bde9f0450a2ec3d62a86d2a0d2fad117f13; from a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 before db0082825037794c5dba9959c9de13ca34cc5e72; from a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 before 2295a7ef5c8c49241bff769e7826ef2582e532a6; from a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 before eacb8b195579c174a6d3e12a9690b206eb7f28cf; from a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 before 81dd3c82a456b0015461754be7cb2693991421b4; from a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 before 5af198c387128a9d2ddd620b0f0803564a4d4508; from a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 before b8af8e6118a6605f0e495a58d591ca94a85a50fc; from a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 before 92f1655aa2b2294d0b49925f3b875a634bd3b59e | CNA record |
linux linux_kernel linux:linux_kernel | 4.6 | CISA ADP |
debian debian_linux debian:debian_linux | 10.0 | NVD |
linux linux_kernel linux:linux_kernel | from 4.6 before 4.19.316; from 4.20 before 5.4.278; from 5.5 before 5.10.219; from 5.11 before 5.15.161; from 5.16 before 6.1.94; from 6.2 before 6.6.34; from 6.7 before 6.9.4 | NVD |
References
- https://git.kernel.org/stable/c/051c0bde9f0450a2ec3d62a86d2a0d2fad117f13patch
- https://git.kernel.org/stable/c/db0082825037794c5dba9959c9de13ca34cc5e72patch
- https://git.kernel.org/stable/c/2295a7ef5c8c49241bff769e7826ef2582e532a6patch
- https://git.kernel.org/stable/c/eacb8b195579c174a6d3e12a9690b206eb7f28cfpatch
- https://git.kernel.org/stable/c/81dd3c82a456b0015461754be7cb2693991421b4patch
- https://git.kernel.org/stable/c/5af198c387128a9d2ddd620b0f0803564a4d4508patch
- https://git.kernel.org/stable/c/b8af8e6118a6605f0e495a58d591ca94a85a50fcpatch
- https://git.kernel.org/stable/c/92f1655aa2b2294d0b49925f3b875a634bd3b59epatch
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.htmlmailing-list
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-36971us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.