Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Reassign nested_mmus array behind mmu_lock kvm->arch.nested_mmus[] is walked under kvm->mmu_lock, including from the MMU notifier path (kvm_unmap_gfn_range() -> kvm_nested_s2_unmap()), which can run at any time. kvm_vcpu_init_nested() reallocates the array and frees the old buffer while holding only kvm->arch.config_lock, so such a walker can reference the freed array. Allocate the new array outside of mmu_lock, as the allocation can sleep. Under the lock, copy the existing entries, fix up the back pointers and reassign the array. Free the old buffer after dropping the lock, as kvfree() can sleep as well.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.11, < 6.18.35 |
References
- https://git.kernel.org/stable/c/4424dbcb06d68e34e51c019a5781a7dc00731971Patch
- https://git.kernel.org/stable/c/70543358fa08e0f7cebc3447c3b70fe97ad7aaa8Patch
- https://git.kernel.org/stable/c/918450ad6010df6ecd2efde12a1409e011da22d6Patch
FAQ
What is CVE-2026-46317?
CVE-2026-46317 is a vulnerability with a CVSS score of 8.8 (HIGH). In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Reassign nested_mmus array behind mmu_lock kvm->arch.nested_mmus[] is walked under kvm->mmu_lock, including from the M...
How severe is CVE-2026-46317?
CVE-2026-46317 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-46317?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.