🛡️ CVE-2025-40126 on Debian — linux

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

In the Linux kernel, the following vulnerability has been resolved: sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC The referenced commit introduced exception handlers on user-space memory references in copy_from_user and copy_to_user. These handlers return from the respective function and calculate the remaining bytes left to copy using the current register contents. This commit fixes a couple of bad calculations. This will fix the return value of copy_from_user and copy_to_user in the faulting case. The behaviour of memcpy stays unchanged.

Distribution advisory

This page covers CVE-2025-40126 as tracked by Debian, for the package linux. The fix is available in version 6.17.6-1; earlier versions remain affected.

Affected software

DEBIAN-CVE-2025-40126 is recorded against 2 packages.

  • linux (fixed in 6.17.6-1)
  • linux-6.1 (fixed in 6.1.158-1~deb11u1)

Timeline and source

Published on 12 November 2025 and last revised on 4 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

CVE-2025-40126 on other distributions

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

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2025-11-12
Updated 2026-08-12
Modified 2026-08-04
Fix URL N/A

Affected Packages

Software From version Fixed in
linux — 6.17.6-1
linux-6.1 — 6.1.158-1~deb11u1

Similar Threats

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