{"id":"CVE-2026-64288","state":"PUBLISHED","title":"KVM: arm64: nv: Avoid dereferencing NULL VNCR pseudo-TLB","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Avoid dereferencing NULL VNCR pseudo-TLB\n\nVNCR TLB invalidation occurs from MMU notifiers or TLBI instructions,\nand either can race against a vcpu not being onlined yet (no pseudo-TLB\nallocated). Similarly, the TLB might be invalid, and the invalidation\nshould be skipped in this case.\n\nBoth kvm_invalidate_vncr_ipa() and kvm_invalidate_vncr_va() are\nexpected to perform the same checks, except that the latter doesn't\ncheck for the allocation and blindly dereferences the pointer.\n\nSolve this by introducing a new iterator built on top of the usual\nkvm_for_each_vcpu() that checks for both of the above conditions,\nand convert the two users to it.","publishedAt":"2026-07-25T08:49:28.789Z","updatedAt":"2026-08-17T04:52:44.195Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929","status":"affected","lessThan":"7c73a269a880b1399baacfb9d521415e6ef7ecc2","versionType":"git"},{"version":"4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929","status":"affected","lessThan":"5fd30133af864a1de0a0bd87d3fe3cf23205fbc7","versionType":"git"},{"version":"4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929","status":"affected","lessThan":"4be6cbeb93d26994bd1827ddbce391e3c4395c8f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm64/kvm/nested.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.16","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm64/kvm/nested.c"]}],"references":["https://git.kernel.org/stable/c/7c73a269a880b1399baacfb9d521415e6ef7ecc2","https://git.kernel.org/stable/c/5fd30133af864a1de0a0bd87d3fe3cf23205fbc7","https://git.kernel.org/stable/c/4be6cbeb93d26994bd1827ddbce391e3c4395c8f"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64288.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64288","state":"PUBLISHED","datePublished":"2026-07-25T08:49:28.789Z","dateUpdated":"2026-08-17T04:52:44.195Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.778Z"},"containers":{"cna":{"title":"KVM: arm64: nv: Avoid dereferencing NULL VNCR pseudo-TLB","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Avoid dereferencing NULL VNCR pseudo-TLB\n\nVNCR TLB invalidation occurs from MMU notifiers or TLBI instructions,\nand either can race against a vcpu not being onlined yet (no pseudo-TLB\nallocated). Similarly, the TLB might be invalid, and the invalidation\nshould be skipped in this case.\n\nBoth kvm_invalidate_vncr_ipa() and kvm_invalidate_vncr_va() are\nexpected to perform the same checks, except that the latter doesn't\ncheck for the allocation and blindly dereferences the pointer.\n\nSolve this by introducing a new iterator built on top of the usual\nkvm_for_each_vcpu() that checks for both of the above conditions,\nand convert the two users to it."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929","status":"affected","lessThan":"7c73a269a880b1399baacfb9d521415e6ef7ecc2","versionType":"git"},{"version":"4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929","status":"affected","lessThan":"5fd30133af864a1de0a0bd87d3fe3cf23205fbc7","versionType":"git"},{"version":"4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929","status":"affected","lessThan":"4be6cbeb93d26994bd1827ddbce391e3c4395c8f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm64/kvm/nested.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.16","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm64/kvm/nested.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/7c73a269a880b1399baacfb9d521415e6ef7ecc2"},{"url":"https://git.kernel.org/stable/c/5fd30133af864a1de0a0bd87d3fe3cf23205fbc7"},{"url":"https://git.kernel.org/stable/c/4be6cbeb93d26994bd1827ddbce391e3c4395c8f"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:52:44.195Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}