CVE-2024-40900

cachefiles: remove requests from xarray during flushing requests

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.

N/A

CVSS

Severity:

EPSS 0.11%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7
https://git.kernel.org/stable/c/50d0e55356ba5b84ffb51c42704126124257e598
https://git.kernel.org/stable/c/37e19cf86a520d65de1de9cb330415c332a40d19
https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013

Frequently Asked Questions

What is the severity of CVE-2024-40900?: CVE-2024-40900 has not yet been assigned a CVSS score.
How to fix CVE-2024-40900?: To fix CVE-2024-40900, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-40900 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2024-40900 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-40900?: CVE-2024-40900 affects Linux Linux, Linux Linux.

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