CVE-2024-36971
net: fix __dst_negative_advice() race
Exploited in the wild. In CISA KEV since 2024‑08‑07. Fixed versions are out.
What to do
Find your product and version, then upgrade to the build on the right.
- LinuxAffected: ≥ a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314, < 051c0bde9f0450a2ec3d62a86d2a0d2fad117f13Upgrade to: 051c0bde9f0450a2ec3d62a86d2a0d2fad117f13Affected: ≥ a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314, < db0082825037794c5dba9959c9de13ca34cc5e72Upgrade to: db0082825037794c5dba9959c9de13ca34cc5e72Affected: ≥ a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314, < 2295a7ef5c8c49241bff769e7826ef2582e532a6Upgrade to: 2295a7ef5c8c49241bff769e7826ef2582e532a6Affected: ≥ a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314, < eacb8b195579c174a6d3e12a9690b206eb7f28cfUpgrade to: eacb8b195579c174a6d3e12a9690b206eb7f28cf + 4 more branchesStated by: CVE record
- ООО «РусБИТех-Астра» Astra Linux Special EditionAffected: 1.7Upgrade to: not statedStated by: BDU
- Сообщество свободного программного обеспечения LinuxAffected: от 6.7 до 6.9.3 включительноUpgrade to: not statedStated by: BDU
- ООО "Открытая мобильная платформа" ОС АврораAffected: до 5.1.1 включительноUpgrade to: not statedStated by: BDU
- АО «НТЦ ИТ РОСА» ROSA Virtualization 3.0Affected: 3.0Upgrade to: not statedStated by: BDU
Versions as the sources state them. Full version matrix after sign-in
Coverage timeline
0 publishersAdded to CISA KEV catalog
Sourced from public security reporting — each date is when it was published, not when it happened.
What it is
From the CVE record
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.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Listed as exploited in the wild since 2024-08-07.
US federal agencies must remediate by 2024-08-28.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
2.7% chance of exploitation activity in the next 30 days, which ranks it in the 86th percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
- Attention now
Sustained.
Lifecycle
7 events over 745 days, from the signal feeds we watch.
- OpenVAS check added
- Patch availablerecord updated
- Added to CISA KEV
- Publishedweakness classified, att&ck mapped
Affected products
And 2 more affected products. See all after sign-in
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Scored 7.8 by NVD.
How it is reached
- Attack Vector LocalRequires local access to the vulnerable system (e.g. local login, malicious file)
- Attack Complexity LowNo special conditions — the attack can be reliably reproduced
- Privileges Required LowRequires basic user-level privileges
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope UnchangedImpact is limited to the vulnerable component itself
Impact if exploited
- Confidentiality HighTotal information disclosure — all data in the component is compromised
- Integrity HighTotal loss of integrity — attacker can modify any data in the component
- Availability HighTotal denial of service — the component is completely unavailable
Weaknesses
ATT&CK techniques
Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.
- Initial AccessT1190Exploit Public-Facing Applicationhigh confidence
- Privilege EscalationT1068Exploitation for Privilege Escalationhigh confidence
Sources
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