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CVE-2024-36971— net: fix __dst_negative_advice() race

Quick assessment

Affected
Linux Linux
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于 net 中的 dst_negative_advice() 存在竞争问题。

CVSS 7.8 · High KEV EPSS 2.70% · P86

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314< 051c0bde9f0450a2ec3d62a86d2a0d2fad117f13 affected
a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314< db0082825037794c5dba9959c9de13ca34cc5e72 affected
a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314< 2295a7ef5c8c49241bff769e7826ef2582e532a6 affected
a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314< eacb8b195579c174a6d3e12a9690b206eb7f28cf affected
a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314< 81dd3c82a456b0015461754be7cb2693991421b4 affected
a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314< 5af198c387128a9d2ddd620b0f0803564a4d4508 affected
a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314< b8af8e6118a6605f0e495a58d591ca94a85a50fc affected
a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314< 92f1655aa2b2294d0b49925f3b875a634bd3b59e affected
… +10 more rows
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I. Basic Information for CVE-2024-36971

Vulnerability Information
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Vulnerability Title
net: fix __dst_negative_advice() race
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于 net 中的 dst_negative_advice() 存在竞争问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314 ~ 051c0bde9f0450a2ec3d62a86d2a0d2fad117f13 -
Linux Linux 4.6 -

II. Public POCs for CVE-2024-36971

# POC Description Source Link Shenlong Link
1 Poc for CVE-2024-36971 https://github.com/Kronk-imp/CVE-2024-36971 POC Details
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III. Intelligence Information for CVE-2024-36971

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Mailing List Discussions for CVE-2024-36971 (1)

Other References for CVE-2024-36971 (8)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-36971

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