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Unrated severityNVD Advisory· Published Jul 29, 2024· Updated Nov 3, 2025

cachefiles: wait for ondemand_object_worker to finish when dropping object

CVE-2024-41051

Description

In the Linux kernel, the following vulnerability has been resolved:

cachefiles: wait for ondemand_object_worker to finish when dropping object

When queuing ondemand_object_worker() to re-open the object, cachefiles_object is not pinned. The cachefiles_object may be freed when the pending read request is completed intentionally and the related erofs is umounted. If ondemand_object_worker() runs after the object is freed, it will incur use-after-free problem as shown below.

process A processs B process C process D

cachefiles_ondemand_send_req() // send a read req X // wait for its completion

// close ondemand fd cachefiles_ondemand_fd_release() // set object as CLOSE

cachefiles_ondemand_daemon_read() // set object as REOPENING queue_work(fscache_wq, &info->ondemand_work)

// close /dev/cachefiles cachefiles_daemon_release cachefiles_flush_reqs complete(&req->done)

// read req X is completed // umount the erofs fs cachefiles_put_object() // object will be freed cachefiles_ondemand_deinit_obj_info() kmem_cache_free(object) // both info and object are freed ondemand_object_worker()

When dropping an object, it is no longer necessary to reopen the object, so use cancel_work_sync() to cancel or wait for ondemand_object_worker() to finish.

Affected products

50

Patches

4
d3179bae72b1
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
ec9289369259
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
12e009d60852
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
b26525b21836
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit

Vulnerability mechanics

Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

4

News mentions

0

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