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THREATINT
PUBLISHED

CVE-2024-36971

net: fix __dst_negative_advice() race



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.

Reserved 2024-05-30 | Published 2024-06-10 | Updated 2024-12-19 | Assigner Linux

CISA Known Exploited Vulnerability

Date added 2024-08-07 | Due date 2024-08-28

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

Product status

Default status
unaffected

a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 before 051c0bde9f0450a2ec3d62a86d2a0d2fad117f13
affected

a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 before db0082825037794c5dba9959c9de13ca34cc5e72
affected

a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 before 2295a7ef5c8c49241bff769e7826ef2582e532a6
affected

a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 before eacb8b195579c174a6d3e12a9690b206eb7f28cf
affected

a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 before 81dd3c82a456b0015461754be7cb2693991421b4
affected

a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 before 5af198c387128a9d2ddd620b0f0803564a4d4508
affected

a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 before b8af8e6118a6605f0e495a58d591ca94a85a50fc
affected

a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 before 92f1655aa2b2294d0b49925f3b875a634bd3b59e
affected

Default status
affected

4.6
affected

Any version before 4.6
unaffected

4.19.316
unaffected

5.4.278
unaffected

5.10.219
unaffected

5.15.161
unaffected

6.1.94
unaffected

6.6.34
unaffected

6.9.4
unaffected

6.10
unaffected

References

git.kernel.org/...c/051c0bde9f0450a2ec3d62a86d2a0d2fad117f13

git.kernel.org/...c/db0082825037794c5dba9959c9de13ca34cc5e72

git.kernel.org/...c/2295a7ef5c8c49241bff769e7826ef2582e532a6

git.kernel.org/...c/eacb8b195579c174a6d3e12a9690b206eb7f28cf

git.kernel.org/...c/81dd3c82a456b0015461754be7cb2693991421b4

git.kernel.org/...c/5af198c387128a9d2ddd620b0f0803564a4d4508

git.kernel.org/...c/b8af8e6118a6605f0e495a58d591ca94a85a50fc

git.kernel.org/...c/92f1655aa2b2294d0b49925f3b875a634bd3b59e

cve.org (CVE-2024-36971)

nvd.nist.gov (CVE-2024-36971)

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