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HIGH CISA KEV

CVE-2024-36971

CVSS v3

7.8

HIGH

EPSS Score

2.7 %

exploit probability, as of 2026-10-20

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • bpftoolAlmaLinux:9all versions · fixed in 7.3.0-427.31.1.el9_4
  • kernelAlmaLinux:9all versions · fixed in 5.14.0-427.31.1.el9_4and 60 other packages

Vendor advisories

  • CVE-2024-36971 Red Hat Product Security1,447 products fixed · 11 known affected

    kernel: net: kernel: UAF in network route management

    kernel-rt as a component of Red Hat Enterprise Linux 7 · kernel-rt-debug as a component of Red Hat Enterprise Linux 7 · kernel-rt-debug-devel as a component of Red Hat Enterprise Linux 7

  • ICSA-25-226-15 CISA2 known affected

    Siemens SINEC OS

    RUGGEDCOM RST2428P (6GK6242-6PA00) · SCALANCE XCM-/XRM-/XCH-/XRH-300 family

  • SSA-613116 Siemens ProductCERT2 known affected

    SSA-613116: Multiple Vulnerabilities in Third-Party Components in SINEC OS before V3.1

    RUGGEDCOM RST2428P (6GK6242-6PA00) · SCALANCE XCM-/XRM-/XCH-/XRH-300 family

  • RHSA-2024:5858 Red Hat Product Security7 products fixed

    Red Hat Security Advisory: kpatch-patch-5_14_0-70_85_1 security update

  • RHSA-2024:5444 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.13.48 bug fix and security update

  • RHSA-2024:5439 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.15.28 bug fix and security update

23 more advisories

Full record on NVD

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.

CISA Known Exploited Vulnerability

Date Added
2024-08-07
Patch Due Date
2024-08-28
Ransomware Use
Unknown

Technical details

Published
2024-06-10

Frequently asked questions

What is CVE-2024-36971?

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.

Is CVE-2024-36971 actively exploited?

Yes. CVE-2024-36971 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2024-08-28.

What is the CVSS score for CVE-2024-36971?

CVE-2024-36971 has a CVSS v3 base score of 7.8 (HIGH severity).

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