Title: el kernel de Linux, Description: En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:

KVM: arm64: Reasignar el array nested_mmus detrás de mmu_lock

kvm->arch.nested_mmus[] es recorrido bajo kvm->mmu_lock, incluyendo desde la ruta del notificador de MMU (kvm_unmap_gfn_range() -> kvm_nested_s2_unmap()), que puede ejecutarse en cualquier momento. kvm_vcpu_init_nested() reasigna el array y libera el búfer antiguo mientras mantiene solo kvm->arch.config_lock, por lo que dicho recorredor puede referenciar el array liberado.

Asignar el nuevo array fuera de mmu_lock, ya que la asignación puede dormir. Bajo el bloqueo, copiar las entradas existentes, corregir los punteros inversos y reasignar el array. Liberar el búfer antiguo después de soltar el bloqueo, ya que kvfree() también puede dormir.

NVD-CWE-noinfo

OR
          *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*
          *cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
          *cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*
          *cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*
          *cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*
          *cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*
          *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.12
          *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.11 up to (excluding) 6.18.35

kernel.org: https://git.kernel.org/stable/c/4424dbcb06d68e34e51c019a5781a7dc00731971 Types: Patch

kernel.org: https://git.kernel.org/stable/c/70543358fa08e0f7cebc3447c3b70fe97ad7aaa8 Types: Patch

kernel.org: https://git.kernel.org/stable/c/918450ad6010df6ecd2efde12a1409e011da22d6 Types: Patch

[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["arch/arm64/kvm/nested.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"4f128f8e1aaac189f83d0f828bcdb2986d8d2e51","lessThan":"918450ad6010df6ecd2efde12a1409e011da22d6","versionType":"git","status":"affected"},{"version":"4f128f8e1aaac189f83d0f828bcdb2986d8d2e51","lessThan":"4424dbcb06d68e34e51c019a5781a7dc00731971","versionType":"git","status":"affected"},{"version":"4f128f8e1aaac189f83d0f828bcdb2986d8d2e51","lessThan":"70543358fa08e0f7cebc3447c3b70fe97ad7aaa8","versionType":"git","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["arch/arm64/kvm/nested.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"6.11","status":"affected"},{"version":"0","lessThan":"6.11","versionType":"semver","status":"unaffected"},{"version":"6.18.35","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"7.0.12","lessThanOrEqual":"7.0.*","versionType":"semver","status":"unaffected"},{"version":"7.1","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]

AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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.

https://git.kernel.org/stable/c/4424dbcb06d68e34e51c019a5781a7dc00731971

https://git.kernel.org/stable/c/70543358fa08e0f7cebc3447c3b70fe97ad7aaa8

https://git.kernel.org/stable/c/918450ad6010df6ecd2efde12a1409e011da22d6