159 lines
8.4 KiB
JSON
159 lines
8.4 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-2022-49562",
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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": "2025-02-26T02:08:31.591Z",
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"datePublished": "2025-02-26T02:14:06.515Z",
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"dateUpdated": "2026-08-05T08:55:46.165Z"
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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": "2026-08-05T08:55:46.165Z"
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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: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits\n\nUse the recently introduced __try_cmpxchg_user() to update guest PTE A/D\nbits instead of mapping the PTE into kernel address space. The VM_PFNMAP\npath is broken as it assumes that vm_pgoff is the base pfn of the mapped\nVMA range, which is conceptually wrong as vm_pgoff is the offset relative\nto the file and has nothing to do with the pfn. The horrific hack worked\nfor the original use case (backing guest memory with /dev/mem), but leads\nto accessing \"random\" pfns for pretty much any other VM_PFNMAP case."
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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:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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 - Exploitation requires local access to /dev/kvm and KVM ioctls (KVM_CREATE_VM/VCPU, KVM_SET_USER_MEMORY_REGION, KVM_TRANSLATE or guest page walks); it is not reachable via network packets.\nAC:L - The attacker fully controls the VM_PFNMAP backing (e.g. io_uring SQE mmap), guest page-table contents, and the ioctl/page-walk trigger, and public reproducers reliably hit the bad memremap/CMPXCHG path.\nPR:L - /dev/kvm is usable by unprivileged local users (kvm group or equivalent); no root or init-namespace admin capability is required, as confirmed by the CVE-2022-1158 disclosure.\nUI:N - The attacker triggers the bug entirely from their own process via KVM and mmap syscalls; no victim action is required.\nS:U - A host userspace KVM client corrupts the host kernel in the same privilege domain; this is local privilege escalation, not a guest-to-host escape across a VM boundary.\nC:H - The bug writes to attacker-influenced wrong physical pages (demonstrated UAF/kernel corruption), which can be leveraged for privilege escalation and thus full confidentiality compromise.\nI:H - cmpxchg_gpte() performs an out-of-bounds CMPXCHG write into incorrectly computed physical memory, enabling arbitrary kernel memory corruption and potential control-flow hijacking.\nA:H - The erroneous physical write reliably causes kernel faults/UAF crashes (as shown by KASAN in the public reproducer), yielding 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/x86/kvm/mmu/paging_tmpl.h"
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],
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"versions": [
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{
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"version": "bd53cb35a3e9adb73a834a36586e9ad80e877767",
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"lessThan": "38b888911e8dc89b89d8147cfb1d2dbe6373bf78",
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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": "bd53cb35a3e9adb73a834a36586e9ad80e877767",
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"lessThan": "8089e5e1d18402fb8152d6b6815450a36fffa9b0",
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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": "bd53cb35a3e9adb73a834a36586e9ad80e877767",
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"lessThan": "f122dfe4476890d60b8c679128cd2259ec96a24c",
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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/x86/kvm/mmu/paging_tmpl.h"
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],
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"versions": [
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{
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"version": "5.2",
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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": "5.2",
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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": "5.17.13",
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"lessThanOrEqual": "5.17.*",
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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": "5.18.2",
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"lessThanOrEqual": "5.18.*",
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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": "5.19",
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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": "5.2",
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"versionEndExcluding": "5.17.13"
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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": "5.2",
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"versionEndExcluding": "5.18.2"
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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": "5.2",
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"versionEndExcluding": "5.19"
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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/38b888911e8dc89b89d8147cfb1d2dbe6373bf78"
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},
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{
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"url": "https://git.kernel.org/stable/c/8089e5e1d18402fb8152d6b6815450a36fffa9b0"
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},
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{
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"url": "https://git.kernel.org/stable/c/f122dfe4476890d60b8c679128cd2259ec96a24c"
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}
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],
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"title": "KVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits",
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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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} |