Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: module/dups: Fix use-after-free in kmod_dup_req lifetime handling The kmod dups code uses RCU to ensure that a kmod_dup_req instance is freed only after it is no longer referenced. When releasing an instance, the kmod_dup_request_delete() function removes the kmod_dup_req from the dup_kmod_reqs list, waits via synchronize_rcu() and finally frees it. However, this doesn't work correctly because parallel users referencing the instance in kmod_dup_request_exists_wait() don't enter an RCU read-side critical section. This can result in a use-after-free. The kmod_dup_request_exists_wait() function may need to hold a valid reference to a kmod_dup_req instance across a blocking wait until the corresponding modprobe command completes. This makes it unsuitable for RCU. Fix the issue by changing the lifecycle management of kmod_dup_req to use reference counting.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 8660484ed1cf3261e89e0bad94c6395597e87599 before a3205bd1f218053575589b14caf8df667f344134; affected 8660484ed1cf3261e89e0bad94c6395597e87599 before 2c85e0fb528e039aa8ea1e9c2a1f64347f990541; affected 8660484ed1cf3261e89e0bad94c6395597e87599 before b2709aad7599f6fd957939b60f4a8323c8f08072; affected 8660484ed1cf3261e89e0bad94c6395597e87599 before cd2396fc9684d2cfd3f3c3f09c79d6d9d725b0ca; affected 8660484ed1cf3261e89e0bad94c6395597e87599 before 5eecb11b543f9f417bcf0dea239ff99c6af65dbd |
| Linux / Linux | affected 6.4; unaffected 0 before 6.4; unaffected 6.6.160 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/a3205bd1f218053575589b14caf8df667f344134
- https://git.kernel.org/stable/c/2c85e0fb528e039aa8ea1e9c2a1f64347f990541
- https://git.kernel.org/stable/c/b2709aad7599f6fd957939b60f4a8323c8f08072
- https://git.kernel.org/stable/c/cd2396fc9684d2cfd3f3c3f09c79d6d9d725b0ca
- https://git.kernel.org/stable/c/5eecb11b543f9f417bcf0dea239ff99c6af65dbd