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🛡️ CVE-2026-31630 — kernel

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

Description

rxrpc: proc: size address buffers for %pISpc output

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

rxrpc: proc: size address buffers for %pISpc output

The AF_RXRPC procfs helpers format local and remote socket addresses into

fixed 50-byte stack buffers with "%pISpc".

That is too small for the longest current-tree IPv6-with-port form the

formatter can produce. In lib/vsprintf.c, the compressed IPv6 path uses a

dotted-quad tail not only for v4mapped addresses, but also for ISATAP

addresses via ipv6_addr_is_isatap().

As a result, a case such as

[ffff:ffff:ffff:ffff:0:5efe:255.255.255.255]:65535

is possible with the current formatter. That is 50 visible characters, so

51 bytes including the trailing NUL, which does not fit in the existing

char[50] buffers used by net/rxrpc/proc.c.

Size the buffers from the formatter's maximum textual form and switch the

call sites to scnprintf().

Changes since v1:

  • correct the changelog to cite the actual maximum current-tree case

explicitly

  • frame the proof around the ISATAP formatting path instead of the earlier

mapped-v4 example

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-2026-31630 is recorded against 2 packages.

  • kernel (from 6.19.0 up to 6.19.13)
  • linux-kernel

Timeline and source

Published on 24 April 2026 and last revised on 12 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)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-31630 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 2026-04-24
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.19.0 6.19.13
linux-kernel — —

Similar Threats

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