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-2026-31553",
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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": "2026-03-09T15:48:24.115Z",
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"datePublished": "2026-04-24T14:35:37.828Z",
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"dateUpdated": "2026-08-05T12:23:27.579Z"
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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": "2026-08-05T12:23:27.579Z"
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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: Fix the descriptor address in __kvm_at_swap_desc()\n\nUsing \"(u64 __user *)hva + offset\" to get the virtual addresses of S1/S2\ndescriptors looks really wrong, if offset is not zero. What we want to get\nfor swapping is hva + offset, not hva + offset*8. ;-)\n\nFix it."
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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 path is reached by local execution of a KVM vCPU that traps arm64 AT instructions through KVM_RUN. It is not reachable by network packets or physical input.\nAC:L - The attacker can control the guest/nested page-table layout, enable hardware Access Flag management, choose a nonzero descriptor offset, and execute the trapping AT instruction. No race or external condition is required.\nPR:L - Exploitation requires control of guest or VM execution state, such as a tenant/guest operator able to run a nested-virtualization-capable VM, but not host administrator privileges. Given uncertainty, this is scored as low rather than high privilege.\nUI:N - No victim action is required once the attacker can run the malicious guest code. The trigger is a direct guest instruction/emulation path.\nS:C - This is a KVM guest-triggered bug in host-side emulation, so a plausible exploit crosses the VM isolation boundary. Corruption can affect memory in the host VMM/VM backing context rather than only the guest instruction stream.\nC:H - The incorrect pointer arithmetic creates guest-controlled memory corruption in the host userspace address used for VM memory, which can be leveraged as part of a VM escape. Per the overestimation rule, this is treated as high confidentiality impact.\nI:H - The CAS targets the wrong address and can write an attacker-influenced descriptor value outside the intended page-table entry. This is a memory corruption primitive with plausible control-flow or data integrity consequences in the VMM/VM boundary context.\nA:H - Repeated triggering can corrupt translation descriptors or adjacent VM/VMM memory and can reliably break guest execution or the VMM handling path. Kernel/KVM memory-corruption paths are scored as high availability impact."
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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/kvm/at.c"
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],
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"versions": [
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{
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"version": "f6927b41d57390c597a126063e2e518911976878",
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"lessThan": "4307e05e568782fc92eff651b09ee5dee88a058d",
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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": "f6927b41d57390c597a126063e2e518911976878",
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"lessThan": "0496acc42fb51eee040b5170cec05cec41385540",
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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/kvm/at.c"
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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": "6.19.11",
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"lessThanOrEqual": "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",
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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": "6.19.11"
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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": "7.0"
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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/4307e05e568782fc92eff651b09ee5dee88a058d"
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},
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{
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"url": "https://git.kernel.org/stable/c/0496acc42fb51eee040b5170cec05cec41385540"
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}
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],
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"title": "KVM: arm64: Fix the descriptor address in __kvm_at_swap_desc()",
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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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} |