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

Exp

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.

Published: 2024-06-10 Last update: 2025-11-05 Assigner: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-36971 is rated Active Exploitation (77.3/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.40%). CISA KEV confirms active exploitation (added 2024-08-07) affecting Android / Kernel. a weakness (CWE-416) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2024-36971

Name: Android Kernel Remote Code Execution Vulnerability · CISA KEV detail

Exploit added: 2024-08-07

Action due: 2024-08-28

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

Exploit prediction scoring system (EPSS) score for CVE-2024-36971

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-29 0.49% 0.40% -0.09%
2 2026-03-22 0.44% 0.49% +0.05%
3 2026-03-12 — 0.44% —

Full EPSS history (30 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-36971

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2024-36971

OS Trackers for CVE-2024-36971

vendor priority summary link
debian not yet assigned CVE-2024-36971 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2024-36971
redhat high — https://access.redhat.com/security/cve/CVE-2024-36971
suse high — https://www.suse.com/security/cve/CVE-2024-36971/
ubuntu high CVE-2024-36971 high priority: Ubuntu including 160 source packages (linux, linux-allwinner-5.19, …), 1686 status rows across 11 suites (bionic, focal, jammy, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1267, released 203, ignored 145, not-affected 71. https://ubuntu.com/security/CVE-2024-36971

Affected software / configurations for CVE-2024-36971

Vendor Product Version Raw CPE
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
linux linux_kernel >= 4.6, < 4.19.316 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 4.20, < 5.4.278 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.5, < 5.10.219 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.11, < 5.15.161 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.16, < 6.1.94 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.2, < 6.6.34 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.7, < 6.9.4 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

References for CVE-2024-36971

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