Bug 2426118 (CVE-2022-50889)

Summary: CVE-2022-50889 kernel: dm integrity: Fix UAF in dm_integrity_dtr()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A use-after-free vulnerability was found in the Linux kernel's device mapper integrity subsystem. When dm_resume() and dm_destroy() execute concurrently, a timer may fire and access freed memory because dm_integrity_dtr() did not properly cancel the timer before freeing resources. The fix adds an additional timer cancellation in the destructor path.
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Description OSIDB Bzimport 2025-12-30 13:10:15 UTC 
In the Linux kernel, the following vulnerability has been resolved:

dm integrity: Fix UAF in dm_integrity_dtr()

Dm_integrity also has the same UAF problem when dm_resume()
and dm_destroy() are concurrent.

Therefore, cancelling timer again in dm_integrity_dtr().
Comment 1 Alexander B 2025-12-31 07:57:05 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025123015-CVE-2022-50889-71c4@gregkh/T