CVE-2026-72278
CriticalCVSS 9.3Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
In the Linux kernel, KVM arm64 (nested mode) did not re-translate the VNCR address on a page fault. The fix invalidates the VNCR TLB entry and re-fetches the translation to allow write mapping on the second attempt.
Risk Assessment
This could lead to incorrect memory mapping, potentially causing page faults or data integrity issues.
Recommendation
Apply the Linux kernel update that re-translates VNCR before injecting an abort.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: nv: Re-translate VNCR before injecting abort KVM faults in the VNCR page with FOLL_WRITE whenever the guest aborts for a write, similar to how a regular stage-2 mapping is handled. It is entirely possible that the guest reads from the VNCR before writing to it, in which case the PFN could only be read-only. Invalidate the VNCR TLB and re-fetch the translation upon taking a VNCR abort, allowing the host mapping to be faulted in for write the second time around. Interestingly enough, this also satisfies the ordering requirements of FEAT_ETS2/3 between descriptor updates and MMU faults.