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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2025-21846 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: acct: perform last write from workqueue In [1] it was reported that the acct(2) system call can be used to trigger NULL deref in cases where it is set to write to a file that triggers an internal lookup. This can e.g., happen when pointing acc(2) to /sys/power/resume. At the point the where the write to this file happens the calling task has already exited and called exit_fs(). A lookup will thus trigger a NULL-deref when accessing current->fs. Reorganize the code so that the the final write happens from the workqueue but with the caller's credentials. This preserves the (strange) permission model and has almost no regression risk. This api should stop to exist though.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://cert-portal.siemens.com/productcert/html/ssa-265688.html siemens-SADP
https://git.kernel.org/stable/c/56d5f3eba3f5de0efdd556de4ef381e109b973a9 kernel.org Patch 
https://git.kernel.org/stable/c/5a59ced8ffc71973d42c82484a719c8f6ac8f7f7 kernel.org Patch 
https://git.kernel.org/stable/c/5c928e14a2ccd99462f2351ead627b58075bb736 kernel.org Patch 
https://git.kernel.org/stable/c/5d5b936cfa4b0d5670ca7420ef165a074bc008eb kernel.org Patch 
https://git.kernel.org/stable/c/5ee8da9bea70dda492d61f075658939af33d8410 kernel.org Patch 
https://git.kernel.org/stable/c/8acbf4a88c6a98c8ed00afd1a7d1abcca9b4735e kernel.org Patch 
https://git.kernel.org/stable/c/a8136afca090412a36429cb6c2543c714d9c0f84 kernel.org Patch 
https://git.kernel.org/stable/c/b03782ae707cc45e65242c7cddd8e28f1c22cde5 kernel.org Patch 
https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html CVE
https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html CVE

Weakness Enumeration

CWE-ID CWE Name Source
CWE-476 NULL Pointer Dereference cwe source acceptance level NIST   CISA-ADP  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

6 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2025-21846
NVD Published Date:
03/12/2025
NVD Last Modified:
05/12/2026
Source:
kernel.org