Bug 2525469 (CVE-2026-80657)

Summary: CVE-2026-80657 kernel: accel/amdxdna: Guard management mailbox channel cleanup against NULL pointer
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's accel/amdxdna component. The management mailbox channel cleanup helpers, `xdna_mailbox_free_channel()` and `xdna_mailbox_stop_channel()`, could be called from error handling paths when the `mgmt_chann` was already destroyed. This could lead to a NULL pointer dereference, potentially causing a system crash and resulting in a Denial of Service (DoS).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-08-28 07:46:34 UTC 
In the Linux kernel, the following vulnerability has been resolved:

accel/amdxdna: Guard management mailbox channel cleanup against NULL pointer

The management mailbox channel cleanup helpers can be called from
error handling paths when mgmt_chann has already been destroyed.

Add NULL checks to xdna_mailbox_free_channel() and
xdna_mailbox_stop_channel() so the cleanup path safely returns instead
of dereferencing a NULL mailbox channel pointer.
Comment 1 gkamathe 2026-09-01 07:17:09 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082845-CVE-2026-80657-650b@gregkh/T