CVE-2024-49855
CRITICAL severity · CVSS 9.8 · Use-after-free
9.8CVSS CRITICAL
Summary
In the Linux kernel, the following vulnerability has been resolved: nbd: fix race between timeout and normal completion If request timetout is handled by nbd_requeue_cmd(), normal completion has to be stopped for avoiding to complete this requeued request, other use-after-free can be triggered. Fix the race by clearing NBD_CMD_INFLIGHT in nbd_requeue_cmd(), meantime make sure that cmd->lock is grabbed for clearing the flag and the requeue.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://git.kernel.org/stable/c/5236ada8ebbd9e7461f17477357582f5be4f46f7 ↗
Additional information
- NVD record
- https://git.kernel.org/stable/c/5236ada8ebbd9e7461f17477357582f5be4f46f7Patch
- https://git.kernel.org/stable/c/6e73b946a379a1dfbb62626af93843bdfb53753dPatch
- https://git.kernel.org/stable/c/9a74c3e6c0d686c26ba2aab66d15ddb89dc139ccPatch
- https://git.kernel.org/stable/c/9c25faf72d780a9c71081710cd48759d61ff6e9bPatch
- https://git.kernel.org/stable/c/c9ea57c91f03bcad415e1a20113bdb2077bcf990Patch
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html