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CVE-2024-40900

cachefiles: remove requests from xarray during flushing requests PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
Linux / Linuxaffected c8383054506c77b814489c09877b5db83fd4abf2 before 9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7; affected c8383054506c77b814489c09877b5db83fd4abf2 before 50d0e55356ba5b84ffb51c42704126124257e598; affected c8383054506c77b814489c09877b5db83fd4abf2 before 37e19cf86a520d65de1de9cb330415c332a40d19; affected c8383054506c77b814489c09877b5db83fd4abf2 before 0fc75c5940fa634d84e64c93bfc388e1274ed013
Linux / Linuxaffected 5.19; unaffected 0 before 5.19; unaffected 6.1.95 through 6.1.*; unaffected 6.6.35 through 6.6.*; unaffected 6.9.6 through 6.9.*; unaffected 6.10 through *

CWE

No CWE identifiers supplied.

References

ADP enrichment

CVE

No English description supplied.

CISA-ADP

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No references supplied.