CVE-20XX-?
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CVE-2024-36971

7.8 HIGH 3% exploit odds exploited in the wild Fix listed Memory safety OS & kernel

What it is

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.

At a glance

Exploitability
Can be exploited locally on the machine with a low-privilege account. High risk of data exposure, data tampering, service disruption.
In the wild
CISA lists this as exploited in real attacks. Treat as urgent.
Fix
A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

  1. ReservedThe CVE id was reserved by its CNA
  2. PublishedDisclosed publicly on CVE.org and NVD
  3. 2024-08-07 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
  4. 2024-08-28 Remediation deadlineCISA's due date for federal agencies to fix it
  5. Last updatedMost recent change to the record

Why it ranks here

Details

Published
Last modified
Added to CISA KEV
2024-08-07
Exploit probability
2.7% · EPSS, next 30 days
Weakness
CWE-416 · Use after free
Record status
Analyzed

Affected

Attack profile CVSS 3.1 · 7.8

Attack vector
Local
Complexity
Low
Privileges needed
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Raw vector

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

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record