CVE-2026-46249
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
A vulnerability has been identified in the Linux kernel that leads to a PF driver crash during kexec booting. The issue arises because the AF state from the old kernel can persist into the new one, causing the PF driver to incorrectly assume AF is ready.
Risk Assessment
Organizations may experience system crashes during boot, leading to downtime and potential data loss. Improper driver behavior may also affect the overall stability of the system.
Recommendation
It is recommended to update the Linux kernel to ensure that the RVUM block revision is cleared during AF shutdown, preventing the PF driver from misdetecting AF readiness.
Original NVD description (English source)
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.