🛡️ CVE-2026-46317 — kernel

🟠 CVSS 8.8 — High ✅ No Known Exploit NVD
8.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

KVM: arm64: Reassign nested_mmus array behind mmu_lock

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2026-46317 is recorded against 3 packages.

  • kernel (from 6.19.0 up to 7.0.12)
  • linux-kernel
  • unknown

Timeline and source

Published on 9 June 2026 and last revised on 6 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-46317 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 8.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-06-09
Updated 2026-08-12
Modified 2026-08-06

Affected Packages

Software From version Fixed in
kernel 6.19.0 7.0.12
linux-kernel — —
unknown — —

Similar Threats

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