🛡️ CVE-2025-71149 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: io_uring/poll: correctly handle io_poll_add() return value on update When the core of io_uring was updated to handle completions consistently and with fixed return codes, the POLL_REMOVE opcode with updates got slightly broken. If a POLL_ADD is pending and then POLL_REMOVE is used to update the events of that request, if that update causes the POLL_ADD to now trigger, then that completion is lost and a CQE is never posted. Additionally, ensure that if an update does cause an existing POLL_ADD to complete, that the completion value isn't always overwritten with -ECANCELED. For that case, whatever io_poll_add() set the value to should just be retained.

Distribution advisory

This page covers CVE-2025-71149 as tracked by Debian, for the package linux. The fix is available in version 6.18.3-1; earlier versions remain affected.

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.

Affected software

DEBIAN-CVE-2025-71149 is recorded against 2 packages.

linux (fixed in 6.18.3-1)
linux-6.1 (fixed in 6.1.162-1~deb11u1)

Timeline and source

Published on 23 January 2026 and last revised on 2 May 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

CVE-2025-71149 on other distributions

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

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

Details

Severity Unknown

CVSS Score N/A

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

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2026-01-23

Updated 2026-08-12

Modified 2026-05-02

Fix URL N/A

Affected Packages

Software	From version	Fixed in
linux	—	6.18.3-1
linux-6.1	—	6.1.162-1~deb11u1

References

ADVISORY https://security-tracker.debian.org/tracker/CVE-2025-71149

🔗 NVD 🔗 Mitre

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