CVE-2024-36971
Android Kernel Remote Code Execution Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 28 August 2024). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 2.70% probability · 85th percentile
- CISA KEV
- Listed 7 August 2024 · due 28 August 2024
- Weakness
- CWE-416
- Affected
- debian/debian linux · linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
CISA notes
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. 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
References
- https://git.kernel.org/stable/c/051c0bde9f0450a2ec3d62a86d2a0d2fad117f13Patch
- https://git.kernel.org/stable/c/2295a7ef5c8c49241bff769e7826ef2582e532a6Patch
- https://git.kernel.org/stable/c/5af198c387128a9d2ddd620b0f0803564a4d4508Patch
- https://git.kernel.org/stable/c/81dd3c82a456b0015461754be7cb2693991421b4Patch
- https://git.kernel.org/stable/c/92f1655aa2b2294d0b49925f3b875a634bd3b59ePatch
- https://git.kernel.org/stable/c/b8af8e6118a6605f0e495a58d591ca94a85a50fcPatch
- https://git.kernel.org/stable/c/db0082825037794c5dba9959c9de13ca34cc5e72Patch
- https://git.kernel.org/stable/c/eacb8b195579c174a6d3e12a9690b206eb7f28cfPatch
- https://git.kernel.org/stable/c/051c0bde9f0450a2ec3d62a86d2a0d2fad117f13Patch
- https://git.kernel.org/stable/c/2295a7ef5c8c49241bff769e7826ef2582e532a6Patch
- https://git.kernel.org/stable/c/5af198c387128a9d2ddd620b0f0803564a4d4508Patch
- https://git.kernel.org/stable/c/81dd3c82a456b0015461754be7cb2693991421b4Patch
- https://git.kernel.org/stable/c/92f1655aa2b2294d0b49925f3b875a634bd3b59ePatch
- https://git.kernel.org/stable/c/b8af8e6118a6605f0e495a58d591ca94a85a50fcPatch
- https://git.kernel.org/stable/c/db0082825037794c5dba9959c9de13ca34cc5e72Patch
- https://git.kernel.org/stable/c/eacb8b195579c174a6d3e12a9690b206eb7f28cfPatch
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.