CVE-2024-36971

high · 7.8Actively exploited

On the CISA Known Exploited Vulnerabilities catalog

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

Added 2024-08-07Remediation due 2024-08-28

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.

7.8

CVSS

2.7%

EPSS (exploit prob.)

85th

EPSS percentile

2024-06-10

Published

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-416

Affected products

Vendor	Product	Affected versions
debian	debian_linux	10.0
linux	linux_kernel	>= 4.6, < 4.19.316
linux	linux_kernel	>= 4.20, < 5.4.278
linux	linux_kernel	>= 5.5, < 5.10.219
linux	linux_kernel	>= 5.11, < 5.15.161
linux	linux_kernel	>= 5.16, < 6.1.94
linux	linux_kernel	>= 6.2, < 6.6.34
linux	linux_kernel	>= 6.7, < 6.9.4

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References

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2024-36971