CVE-2024-36971
net: fix __dst_negative_advice() race
Android Kernel Remote Code Execution Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA notes
This vulnerability affects a common open-source component, third-party library, or a protocol used by different products. Please check with specific vendors for information on patching status. For more information, please see: https://source.android.com/docs/security/bulletin/2024-08-01, https://lore.kernel.org/linux-cve-announce/20240610090330.1347021-2-lee@kernel.org/T/#u ; https://nvd.nist.gov/vuln/detail/CVE-2024-36971
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.
Severity
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HAffected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Linux | Linux | a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 to <051c0bde9f0450a2ec3d62a86d2a0d2fad117f13 a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 to <db0082825037794c5dba9959c9de13ca34cc5e72 a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 to <2295a7ef5c8c49241bff769e7826ef2582e532a6 a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 to <eacb8b195579c174a6d3e12a9690b206eb7f28cf a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 to <81dd3c82a456b0015461754be7cb2693991421b4 a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 to <5af198c387128a9d2ddd620b0f0803564a4d4508 a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 to <b8af8e6118a6605f0e495a58d591ca94a85a50fc a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 to <92f1655aa2b2294d0b49925f3b875a634bd3b59e |
| Linux | Linux | 4.6 0 to <4.6 (unaffected) 4.19.316 to 4.19.* (unaffected) 5.4.278 to 5.4.* (unaffected) 5.10.219 to 5.10.* (unaffected) 5.15.161 to 5.15.* (unaffected) 6.1.94 to 6.1.* (unaffected) 6.6.34 to 6.6.* (unaffected) 6.9.4 to 6.9.* (unaffected) 6.10 to * (unaffected) |
References
9 Links- https://git.kernel.org/stable/c/051c0bde9f0450a2ec3d62a86d2a0d2fad117f13
- https://git.kernel.org/stable/c/db0082825037794c5dba9959c9de13ca34cc5e72
- https://git.kernel.org/stable/c/2295a7ef5c8c49241bff769e7826ef2582e532a6
- https://git.kernel.org/stable/c/eacb8b195579c174a6d3e12a9690b206eb7f28cf
- https://git.kernel.org/stable/c/81dd3c82a456b0015461754be7cb2693991421b4
- https://git.kernel.org/stable/c/5af198c387128a9d2ddd620b0f0803564a4d4508
- https://git.kernel.org/stable/c/b8af8e6118a6605f0e495a58d591ca94a85a50fc
- https://git.kernel.org/stable/c/92f1655aa2b2294d0b49925f3b875a634bd3b59e
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
Record Details
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