Bug 2347804 (CVE-2022-49426)

Summary: CVE-2022-49426 kernel: iommu/arm-smmu-v3-sva: Fix mm use-after-free
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2025-02-26 03:07:18 UTC 
In the Linux kernel, the following vulnerability has been resolved:

iommu/arm-smmu-v3-sva: Fix mm use-after-free

We currently call arm64_mm_context_put() without holding a reference to
the mm, which can result in use-after-free. Call mmgrab()/mmdrop() to
ensure the mm only gets freed after we unpinned the ASID.
Comment 1 Avinash Hanwate 2025-02-26 14:07:32 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022655-CVE-2022-49426-313d@gregkh/T
Comment 4 Avinash Hanwate 2025-02-26 18:14:34 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022655-CVE-2022-49426-313d@gregkh/T