Medium 5.5Published Mar 12, 2025

CVE-2025-21846acct: perform last write from workqueue

Updated under an hour ago (Oct 27, 2026, 2:50 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-476
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 8acbf4a88c6a98c8ed00afd1a7d1abcca9b4735e; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before b03782ae707cc45e65242c7cddd8e28f1c22cde5; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 5d5b936cfa4b0d5670ca7420ef165a074bc008eb; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 5ee8da9bea70dda492d61f075658939af33d8410; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 5c928e14a2ccd99462f2351ead627b58075bb736; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 5a59ced8ffc71973d42c82484a719c8f6ac8f7f7; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before a8136afca090412a36429cb6c2543c714d9c0f84; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 56d5f3eba3f5de0efdd556de4ef381e109b973a9	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.12 before 6.1.130; from 6.2 before 6.6.80; from 6.7 before 6.12.17; from 6.13 before 6.13.5; 6.14; 6.14; 6.14	NVD

References

References

https://git.kernel.org/stable/c/8acbf4a88c6a98c8ed00afd1a7d1abcca9b4735e	patch
https://git.kernel.org/stable/c/b03782ae707cc45e65242c7cddd8e28f1c22cde5	patch
https://git.kernel.org/stable/c/5d5b936cfa4b0d5670ca7420ef165a074bc008eb	patch
https://git.kernel.org/stable/c/5ee8da9bea70dda492d61f075658939af33d8410	patch
https://git.kernel.org/stable/c/5c928e14a2ccd99462f2351ead627b58075bb736	patch
https://git.kernel.org/stable/c/5a59ced8ffc71973d42c82484a719c8f6ac8f7f7	patch
https://git.kernel.org/stable/c/a8136afca090412a36429cb6c2543c714d9c0f84	patch
https://git.kernel.org/stable/c/56d5f3eba3f5de0efdd556de4ef381e109b973a9	patch
https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.