{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53200","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-06-09T07:44:35.391Z","datePublished":"2026-06-25T08:39:08.968Z","dateUpdated":"2026-08-05T12:34:03.957Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:34:03.957Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Fix handling of XN[0] when !FEAT_XNX\n\nXN has already been extracted from its bitfield position so using\nFIELD_PREP() on the mask that clears XN[0] is completely broken, having\nthe effect of unconditionally granting execute permissions...\n\nFix the obvious mistake by manipulating the right bit."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable KVM arm64 nested-virtualization path is reached by local KVM ioctls and guest execution through /dev/kvm, not by network packets or physical access.\nAC:L - Once nested virtualization is available and FEAT_XNX is absent or not exposed, the faulty mask deterministically treats nested stage-2 translations as executable. The attacker controls the guest execution and the relevant nested stage-2 descriptors in the practical attack setup.\nPR:L - The attacker needs local ability to create/run a KVM VM with nested EL2 enabled, but the traced ioctl path does not require real root or CAP_SYS_ADMIN. This is low privilege rather than high privilege.\nUI:N - No victim action is required after the attacker can run the nested VM; execution faults and shadow stage-2 mappings are handled automatically by KVM.\nS:C - The bug is in the host KVM enforcement of L1-controlled stage-2 execute permissions and can let an L2 guest violate the L1 hypervisor's security policy. That crosses a virtualization security boundary.\nC:H - By bypassing L1-enforced execute-never/W^X policy, an attacker can plausibly gain arbitrary execution in a protected nested guest context and read data protected by that policy. There is no host memory-corruption primitive, but the crossed nested-virtualization boundary supports high confidentiality impact.\nI:H - The flaw directly grants execute permission where the L1 stage-2 page tables intended to deny it. This can allow attacker-controlled code execution and full integrity compromise of the protected nested guest context.\nA:H - Arbitrary execution after bypassing the nested execute restriction can be used to crash or halt the protected guest/security domain. No host kernel panic is required for high availability impact across that boundary."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm64/include/asm/kvm_nested.h"],"versions":[{"version":"d93febe2ed2e0491af9d47f0ee6d4b01918877f4","lessThan":"b95976c2ea446044553a5f469c0bae13553d75ab","status":"affected","versionType":"git"},{"version":"d93febe2ed2e0491af9d47f0ee6d4b01918877f4","lessThan":"49b32ddb87a3a109afecea89e55d70f73956b8bc","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm64/include/asm/kvm_nested.h"],"versions":[{"version":"6.19","status":"affected"},{"version":"0","lessThan":"6.19","status":"unaffected","versionType":"semver"},{"version":"7.0.13","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.0.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/b95976c2ea446044553a5f469c0bae13553d75ab"},{"url":"https://git.kernel.org/stable/c/49b32ddb87a3a109afecea89e55d70f73956b8bc"}],"title":"KVM: arm64: nv: Fix handling of XN[0] when !FEAT_XNX","x_generator":{"engine":"bippy-1.2.0"}}}}