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🛡️ CVE-2025-39826 — debian-linux

🟠 CVSS 8.8 — High ✅ No Known Exploit CWE-416 NVD
8.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

net: rose: convert 'use' field to refcount_t

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

net: rose: convert 'use' field to refcount_t

The 'use' field in struct rose_neigh is used as a reference counter but

lacks atomicity. This can lead to race conditions where a rose_neigh

structure is freed while still being referenced by other code paths.

For example, when rose_neigh->use becomes zero during an ioctl operation

via rose_rt_ioctl(), the structure may be removed while its timer is

still active, potentially causing use-after-free issues.

This patch changes the type of 'use' from unsigned short to refcount_t and

updates all code paths to use rose_neigh_hold() and rose_neigh_put() which

operate reference counts atomically.

How this vulnerability can be exploited

This issue can be reached from an adjacent network, attack complexity is low, an attacker needs no 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.

Weakness class

CVE-2025-39826 is classified as CWE-416: Use After Free. Memory is used after being released, so its contents may already belong to something else.

Affected software

CVE-2025-39826 is recorded against 3 packages.

  • debian-linux
  • kernel (from 6.13.0 up to 6.16.5)
  • linux-kernel

Timeline and source

Published on 16 September 2025 and last revised on 30 July 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
lists.debian.org
cert-portal.siemens.com
cert-portal.siemens.com

CVE-2025-39826 on other distributions

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

Details

Severity HIGH
CVSS Score 8.8
CVSS Vector CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-416
Public Exploit ✅ No
Source NVD
Published 2025-09-16
Updated 2026-08-20
Modified 2026-07-30

Affected Packages

Software From version Fixed in
debian-linux — —
kernel 6.13.0 6.16.5
linux-kernel — —

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.