CVE-2024-36971

HIGH CISA KEV EPSS 84.1%
Published Jun 10, 20242y ago · Modified Jun 17, 20262w ago
7.8 CVSS 3.1
High
Find Similar
Published Jun 10, 2024 2y ago
Last Modified Jun 17, 2026 2w ago
KEV Listed Aug 7, 2024 1y ago
KEV Due Aug 28, 2024 677d overdue

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 Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

CISA Known Exploited Overdue 677d
Added
Aug 7, 2024
Due
Aug 28, 2024

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

EPSS Exploit Probability
84.1% percentile
Exploit & Patch Status
Actively Exploited (KEV)
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 8

VendorProductVersionRange
debiandebian_linux10.0any
linuxlinux_kernel*≥4.6  –  <4.19.316
linuxlinux_kernel*≥4.20  –  <5.4.278
linuxlinux_kernel*≥5.5  –  <5.10.219
linuxlinux_kernel*≥5.11  –  <5.15.161
linuxlinux_kernel*≥5.16  –  <6.1.94
linuxlinux_kernel*≥6.2  –  <6.6.34
linuxlinux_kernel*≥6.7  –  <6.9.4

References 10

  • git.kernel.org https://git.kernel.org/stable/c/051c0bde9f0450a2ec3d62a86d2a0d2fad117f13
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2295a7ef5c8c49241bff769e7826ef2582e532a6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5af198c387128a9d2ddd620b0f0803564a4d4508
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/81dd3c82a456b0015461754be7cb2693991421b4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/92f1655aa2b2294d0b49925f3b875a634bd3b59e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b8af8e6118a6605f0e495a58d591ca94a85a50fc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/db0082825037794c5dba9959c9de13ca34cc5e72
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/eacb8b195579c174a6d3e12a9690b206eb7f28cf
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
    Mailing List
  • cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-36971
    US Government Resource

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/051c0bde9f0450a2ec3d62a86d2a0d2fad117f13
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2295a7ef5c8c49241bff769e7826ef2582e532a6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5af198c387128a9d2ddd620b0f0803564a4d4508
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/81dd3c82a456b0015461754be7cb2693991421b4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/92f1655aa2b2294d0b49925f3b875a634bd3b59e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b8af8e6118a6605f0e495a58d591ca94a85a50fc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/db0082825037794c5dba9959c9de13ca34cc5e72
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/eacb8b195579c174a6d3e12a9690b206eb7f28cf
    Patch