CVE-2025-21846

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Source
https://cve.org/CVERecord?id=CVE-2025-21846
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21846.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-21846
Downstream
Related
Published
2025-03-12T09:42:02.635Z
Modified
2026-03-11T07:50:39.553057049Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
acct: perform last write from workqueue
Details

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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21846.json",
    "cna_assigner": "Linux"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Fixed
8acbf4a88c6a98c8ed00afd1a7d1abcca9b4735e
Fixed
b03782ae707cc45e65242c7cddd8e28f1c22cde5
Fixed
5d5b936cfa4b0d5670ca7420ef165a074bc008eb
Fixed
5ee8da9bea70dda492d61f075658939af33d8410
Fixed
5c928e14a2ccd99462f2351ead627b58075bb736
Fixed
5a59ced8ffc71973d42c82484a719c8f6ac8f7f7
Fixed
a8136afca090412a36429cb6c2543c714d9c0f84
Fixed
56d5f3eba3f5de0efdd556de4ef381e109b973a9

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21846.json"