CVE-2025-21846
acct: perform last write from workqueue
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acct: perform last write from workqueue
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.
Reserved 2024-12-29 | Published 2025-03-12 | Updated 2025-03-13 | Assigner Linuxgit.kernel.org/...c/8acbf4a88c6a98c8ed00afd1a7d1abcca9b4735e
git.kernel.org/...c/b03782ae707cc45e65242c7cddd8e28f1c22cde5
git.kernel.org/...c/5d5b936cfa4b0d5670ca7420ef165a074bc008eb
git.kernel.org/...c/5ee8da9bea70dda492d61f075658939af33d8410
git.kernel.org/...c/5c928e14a2ccd99462f2351ead627b58075bb736
git.kernel.org/...c/5a59ced8ffc71973d42c82484a719c8f6ac8f7f7
git.kernel.org/...c/a8136afca090412a36429cb6c2543c714d9c0f84
git.kernel.org/...c/56d5f3eba3f5de0efdd556de4ef381e109b973a9
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