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🛡️ CVE-2025-38312 — debian-linux

🟡 CVSS 5.5 — Medium ✅ No Known Exploit CWE-369 NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

fbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod()

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

fbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod()

In fb_find_mode_cvt(), iff mode->refresh somehow happens to be 0x80000000,

cvt.f_refresh will become 0 when multiplying it by 2 due to overflow. It's

then passed to fb_cvt_hperiod(), where it's used as a divider -- division

by 0 will result in kernel oops. Add a sanity check for cvt.f_refresh to

avoid such overflow...

Found by Linux Verification Center (linuxtesting.org) with the Svace static

analysis tool.

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 none, integrity none, availability high.

Weakness class

CVE-2025-38312 is classified as CWE-369: Divide By Zero. A divisor derived from input is not checked for zero, terminating or destabilising the process.

Affected software

CVE-2025-38312 is recorded against 3 packages.

  • debian-linux
  • kernel (from 6.13.0 up to 6.15.3)
  • linux-kernel (from 6.13 up to 6.15.3)

Timeline and source

Published on 10 July 2025 and last revised on 17 June 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
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
lists.debian.org
lists.debian.org
cert-portal.siemens.com

CVE-2025-38312 on other distributions

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

Details

Severity MEDIUM
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE CWE-369
Public Exploit ✅ No
Source NVD
Published 2025-07-10
Updated 2026-08-20
Modified 2026-06-17

Affected Packages

Software From version Fixed in
debian-linux — —
kernel 6.13.0 6.15.3
linux-kernel 6.13 6.15.3

References

Similar Threats

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