138 lines
7.4 KiB
JSON
138 lines
7.4 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-53200",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-06-09T07:44:35.391Z",
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"datePublished": "2026-06-25T08:39:08.968Z",
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"dateUpdated": "2026-08-05T12:34:03.957Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:34:03.957Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
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"baseScore": 8.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/arm64/include/asm/kvm_nested.h"
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],
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"versions": [
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{
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"version": "d93febe2ed2e0491af9d47f0ee6d4b01918877f4",
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"lessThan": "b95976c2ea446044553a5f469c0bae13553d75ab",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "d93febe2ed2e0491af9d47f0ee6d4b01918877f4",
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"lessThan": "49b32ddb87a3a109afecea89e55d70f73956b8bc",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/arm64/include/asm/kvm_nested.h"
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],
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"versions": [
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{
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"version": "6.19",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.19",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0.13",
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"lessThanOrEqual": "7.0.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.19",
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"versionEndExcluding": "7.0.13"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.19",
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"versionEndExcluding": "7.1"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/b95976c2ea446044553a5f469c0bae13553d75ab"
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},
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{
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"url": "https://git.kernel.org/stable/c/49b32ddb87a3a109afecea89e55d70f73956b8bc"
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}
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],
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"title": "KVM: arm64: nv: Fix handling of XN[0] when !FEAT_XNX",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |