CVE - CVE-2025-21846

CVE-ID
CVE-2025-21846	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/56d5f3eba3f5de0efdd556de4ef381e109b973a9 URL:https://git.kernel.org/stable/c/56d5f3eba3f5de0efdd556de4ef381e109b973a9 MISC:https://git.kernel.org/stable/c/5a59ced8ffc71973d42c82484a719c8f6ac8f7f7 URL:https://git.kernel.org/stable/c/5a59ced8ffc71973d42c82484a719c8f6ac8f7f7 MISC:https://git.kernel.org/stable/c/5c928e14a2ccd99462f2351ead627b58075bb736 URL:https://git.kernel.org/stable/c/5c928e14a2ccd99462f2351ead627b58075bb736 MISC:https://git.kernel.org/stable/c/5d5b936cfa4b0d5670ca7420ef165a074bc008eb URL:https://git.kernel.org/stable/c/5d5b936cfa4b0d5670ca7420ef165a074bc008eb MISC:https://git.kernel.org/stable/c/5ee8da9bea70dda492d61f075658939af33d8410 URL:https://git.kernel.org/stable/c/5ee8da9bea70dda492d61f075658939af33d8410 MISC:https://git.kernel.org/stable/c/8acbf4a88c6a98c8ed00afd1a7d1abcca9b4735e URL:https://git.kernel.org/stable/c/8acbf4a88c6a98c8ed00afd1a7d1abcca9b4735e MISC:https://git.kernel.org/stable/c/a8136afca090412a36429cb6c2543c714d9c0f84 URL:https://git.kernel.org/stable/c/a8136afca090412a36429cb6c2543c714d9c0f84 MISC:https://git.kernel.org/stable/c/b03782ae707cc45e65242c7cddd8e28f1c22cde5 URL:https://git.kernel.org/stable/c/b03782ae707cc45e65242c7cddd8e28f1c22cde5
Assigning CNA
kernel.org
Date Record Created
20241229	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241229)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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