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🛡️ CVE-2026-31532 — kernel

🟠 CVSS 7.8 — High ✅ No Known Exploit NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

can: raw: fix ro->uniq use-after-free in raw_rcv()

In the Linux kernel, the following vulnerability has been resolved:

can: raw: fix ro->uniq use-after-free in raw_rcv()

raw_release() unregisters raw CAN receive filters via can_rx_unregister(),

but receiver deletion is deferred with call_rcu(). This leaves a window

where raw_rcv() may still be running in an RCU read-side critical section

after raw_release() frees ro->uniq, leading to a use-after-free of the

percpu uniq storage.

Move free_percpu(ro->uniq) out of raw_release() and into a raw-specific

socket destructor. can_rx_unregister() takes an extra reference to the

socket and only drops it from the RCU callback, so freeing uniq from

sk_destruct ensures the percpu area is not released until the relevant

callbacks have drained.

[mkl: applied manually]

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2026-31532 is recorded against 2 packages.

  • kernel (from 6.20.0 up to 7.0.1)
  • linux-kernel (from 7.0 up to 7.0.1)

Timeline and source

Published on 23 April 2026 and last revised on 15 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-31532 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-04-23
Updated 2026-08-20
Modified 2026-08-15

Affected Packages

Software From version Fixed in
kernel 6.20.0 7.0.1
linux-kernel 7.0 7.0.1

References

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.