CISA KEV catalog
Confirmed active exploitation.
Listed in CISA's catalog of Known Exploited Vulnerabilities: attackers are using it in real attacks. Patch it with priority.
- Name
- Android Kernel Remote Code Execution Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Description
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.
Affected products
debian: debian linux; linux: linux kernel
References10
- git.kernel.org/stable/c/051c0bde9f0450a2ec3d62a86d2a0d2fad117f13 Patch
- git.kernel.org/stable/c/2295a7ef5c8c49241bff769e7826ef2582e532a6 Patch
- git.kernel.org/stable/c/5af198c387128a9d2ddd620b0f0803564a4d4508 Patch
- git.kernel.org/stable/c/81dd3c82a456b0015461754be7cb2693991421b4 Patch
- git.kernel.org/stable/c/92f1655aa2b2294d0b49925f3b875a634bd3b59e Patch
- git.kernel.org/stable/c/b8af8e6118a6605f0e495a58d591ca94a85a50fc Patch
- git.kernel.org/stable/c/db0082825037794c5dba9959c9de13ca34cc5e72 Patch
- git.kernel.org/stable/c/eacb8b195579c174a6d3e12a9690b206eb7f28cf Patch
- git.kernel.org/stable/c/051c0bde9f0450a2ec3d62a86d2a0d2fad117f13 Patch
- git.kernel.org/stable/c/2295a7ef5c8c49241bff769e7826ef2582e532a6 Patch
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 3% percentile: 86 · as of 3 November 2026
- CWE
- CWE-416
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