Known exploited vulnerability · Android

CVE-2024-36971: Android Kernel Remote Code Execution Vulnerability

highCVSS 3.1 7.8Exploited

In the Linux kernel, the following vulnerability has been resolved: net: fix dstnegativeadvice() race dstnegativeadvice() does not enforce proper RCU rules when sk-dstcache must be cleared, leading to possible UAF. RCU rules are that we must first clear sk-skdstcache, then call dstrelease(olddst). Note that skdstreset(sk) is implementing this protocol correctly, while dstnegativeadvice() uses the wrong order.

Published Jun 10, 2024 · Updated Jun 17, 2026

Required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Advisory details

From the National Vulnerability Database. This product uses the NVD API but is not endorsed or certified by the NVD.

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.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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