🛡️ CVE-2025-40053 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: net: dlink: handle copy_thresh allocation failure The driver did not handle failure of netdev_alloc_skb_ip_align(). If the allocation failed, dereferencing skb->protocol could lead to a NULL pointer dereference. This patch tries to allocate skb. If the allocation fails, it falls back to the normal path. Tested-on: D-Link DGE-550T Rev-A3

Distribution advisory

This page covers CVE-2025-40053 as tracked by Debian, for the package linux. The fix is available in version 6.17.6-1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the 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 none, integrity none, availability high.

Affected software

DEBIAN-CVE-2025-40053 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 28 October 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-2025-40053 on other distributions

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

BellSoft Base record Debian 11 (Root.io)Debian 12 (Root.io)Debian 13 (Root.io)Ubuntu 22.04 (Root.io)Ubuntu 24.04 (Root.io)Ubuntu

Details

Severity Unknown

CVSS Score N/A

CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2025-10-28

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

References

ADVISORY https://security-tracker.debian.org/tracker/CVE-2025-40053

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