Bug 2320236 (CVE-2024-49855)

Summary: CVE-2024-49855 kernel: nbd: fix race between timeout and normal completion
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Bug Depends On: 2320386    
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Description OSIDB Bzimport 2024-10-21 13:04:27 UTC 
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.
Comment 1 Robb Gatica 2024-10-21 15:54:37 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102153-CVE-2024-49855-8997@gregkh/T