CVE-2026-46317
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.
Affected versions
Linux kernel versions
6.11
and later are affected. Fixed in
6.18.35,
7.0.12,
7.1-rc7
and their respective stable series.
References
The following references provide additional information about CVE-2026-46317 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/4424dbcb06d68e34e51c019a5781a7dc00731971
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PatchKernel patch commithttps://git.kernel.org/stable/c/70543358fa08e0f7cebc3447c3b70fe97ad7aaa8
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PatchKernel patch commithttps://git.kernel.org/stable/c/918450ad6010df6ecd2efde12a1409e011da22d6
Frequently asked questions
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What is CVE-2026-46317?
CVE-2026-46317 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.11 onward and has been patched in 6.18.35, 7.0.12 and 7.1-rc7. CVE-2026-46317 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-46317?
Yes — CVE-2026-46317 has been patched. Fixed versions include 6.18.35, 7.0.12 and 7.1-rc7. If you are running Linux kernel 6.11 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-46317 actively exploited?
No — CVE-2026-46317 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.