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Unrated severityNVD Advisory· Published Jul 12, 2024· Updated Nov 3, 2025

cachefiles: remove requests from xarray during flushing requests

CVE-2024-40900

Description

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

cachefiles: remove requests from xarray during flushing requests

Even with CACHEFILES_DEAD set, we can still read the requests, so in the following concurrency the request may be used after it has been freed:

mount | daemon_thread1 | daemon_thread2 ------------------------------------------------------------ cachefiles_ondemand_init_object cachefiles_ondemand_send_req REQ_A = kzalloc(sizeof(*req) + data_len) wait_for_completion(&REQ_A->done) cachefiles_daemon_read cachefiles_ondemand_daemon_read // close dev fd cachefiles_flush_reqs complete(&REQ_A->done) kfree(REQ_A) xa_lock(&cache->reqs); cachefiles_ondemand_select_req req->msg.opcode != CACHEFILES_OP_READ // req use-after-free !!! xa_unlock(&cache->reqs); xa_destroy(&cache->reqs)

Hence remove requests from cache->reqs when flushing them to avoid accessing freed requests.

Affected products

98

Patches

4
0fc75c5940fa
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
37e19cf86a52
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
50d0e55356ba
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
9f13aacdd4ee
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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