CVE-2026-46317KVM: arm64: Reassign nested_mmus array behind mmu_lock
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 before 918450ad6010df6ecd2efde12a1409e011da22d6; from 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 before 4424dbcb06d68e34e51c019a5781a7dc00731971; from 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 before 70543358fa08e0f7cebc3447c3b70fe97ad7aaa8 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.11 before 6.18.35; from 6.19 before 7.0.12; 7.1; 7.1; 7.1; 7.1; 7.1; 7.1 | NVD |
References
- https://git.kernel.org/stable/c/918450ad6010df6ecd2efde12a1409e011da22d6patch
- https://git.kernel.org/stable/c/4424dbcb06d68e34e51c019a5781a7dc00731971patch
- https://git.kernel.org/stable/c/70543358fa08e0f7cebc3447c3b70fe97ad7aaa8patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.