Bug 2513412 (CVE-2026-68380)

Summary:	CVE-2026-68380 kernel: accel/amdxdna: Fix use-after-free of mm_struct in job scheduler
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's AMD XDNA accelerator driver. The `amdxdna_cmd_submit()` function improperly handles references to the `mm_struct` when scheduling jobs. This can lead to a use-after-free vulnerability, where the `mm_struct` is deallocated before the job scheduler can access it. A local attacker could potentially exploit this memory corruption to cause system instability or a denial of service.	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 2026-08-10 12:35:53 UTC

In the Linux kernel, the following vulnerability has been resolved:

accel/amdxdna: Fix use-after-free of mm_struct in job scheduler

amdxdna_cmd_submit() stores current->mm in job->mm without holding any
reference. aie2_sched_job_run() later access job->mm from the DRM
scheduler worker thread. With only a raw pointer and no structural
reference, the mm_struct can be freed before the scheduler runs the job.

Fix this by calling mmgrab() to hold a structural mm_count reference for
the lifetime of the job, paired with mmdrop() in every cleanup path.

Comment 1 gkamathe 2026-08-11 15:18:03 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081044-CVE-2026-68380-abce@gregkh/T