CVE-2026-46249: octeontx2-af: Fix PF driver crash with kexec kernel booting
In the Linux kernel, the following vulnerability has been resolved:
octeontx2-af: Fix PF driver crash with kexec kernel booting
During a kexec reboot the hardware is not power-cycled, so AF state from the old kernel can persist into the new kernel. When AF and PF drivers are built as modules, the PF driver may probe before AF reinitializes the hardware.
The PF driver treats the RVUM block revision as an indication that AF initialization is complete. If this value is left uncleared at shutdown, PF may incorrectly assume AF is ready and access stale hardware state, leading to a crash.
Clear the RVUM block revision during AF shutdown to avoid PF mis-detecting AF readiness after kexec.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
Clear the RVUM block revision during AF shutdown so PF does not mis-detect AF readiness and access stale hardware state during a kexec reboot (where hardware is not power-cycled).
octeontx2-af (AF) RVUM block revision (clear during AF shutdown) = clear RVUM block revision during AF shutdown
Event History
Frequently Asked Questions
What is the severity of CVE-2026-46249?
CVE-2026-46249 has a medium severity rating of 5.5.
How do I fix CVE-2026-46249?
To fix CVE-2026-46249, ensure that you update to a patched version of the Linux kernel that addresses this vulnerability.
What systems are affected by CVE-2026-46249?
CVE-2026-46249 affects systems running the Linux kernel with the octeontx2-af driver.
What is the impact of CVE-2026-46249?
CVE-2026-46249 can lead to a driver crash during a kexec reboot, potentially causing system instability.
When was CVE-2026-46249 published?
CVE-2026-46249 was published on June 3, 2026.