CVE-2022-49562

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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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/kvm/mmu/paging_tmpl.h"], "versions": [{"version": "bd53cb35a3e9adb73a834a36586e9ad80e877767", "lessThan": "38b888911e8dc89b89d8147cfb1d2dbe6373bf78", "status": "affected", "versionType": "git"}, {"version": "bd53cb35a3e9adb73a834a36586e9ad80e877767", "lessThan": "8089e5e1d18402fb8152d6b6815450a36fffa9b0", "status": "affected", "versionType": "git"}, {"version": "bd53cb35a3e9adb73a834a36586e9ad80e877767", "lessThan": "f122dfe4476890d60b8c679128cd2259ec96a24c", "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/x86/kvm/mmu/paging_tmpl.h"], "versions": [{"version": "5.2", "status": "affected"}, {"version": "0", "lessThan": "5.2", "status": "unaffected", "versionType": "semver"}, {"version": "5.17.13", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.18.2", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.19", "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": "5.2", "versionEndExcluding": "5.17.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "5.18.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "5.19"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/38b888911e8dc89b89d8147cfb1d2dbe6373bf78"}, {"url": "https://git.kernel.org/stable/c/8089e5e1d18402fb8152d6b6815450a36fffa9b0"}, {"url": "https://git.kernel.org/stable/c/f122dfe4476890d60b8c679128cd2259ec96a24c"}], "title": "KVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/x86/kvm/mmu/paging_tmpl.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "38b888911e8dc89b89d8147cfb1d2dbe6373bf78", "status": "affected", "version": "bd53cb35a3e9adb73a834a36586e9ad80e877767", "versionType": "git"}, {"lessThan": "8089e5e1d18402fb8152d6b6815450a36fffa9b0", "status": "affected", "version": "bd53cb35a3e9adb73a834a36586e9ad80e877767", "versionType": "git"}, {"lessThan": "f122dfe4476890d60b8c679128cd2259ec96a24c", "status": "affected", "version": "bd53cb35a3e9adb73a834a36586e9ad80e877767", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/x86/kvm/mmu/paging_tmpl.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.2"}, {"lessThan": "5.2", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.17.*", "status": "unaffected", "version": "5.17.13", "versionType": "semver"}, {"lessThanOrEqual": "5.18.*", "status": "unaffected", "version": "5.18.2", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.19", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "036CD419-598A-4414-8106-19AC0696AAF2", "versionEndExcluding": "5.17.13", "versionStartIncluding": "5.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9FF255A1-64F4-4E31-AF44-C92FB8773BA2", "versionEndExcluding": "5.18.2", "versionStartIncluding": "5.18", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "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."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: x86: Use __try_cmpxchg_user() para actualizar los bits A/D de la PTE invitada Use la recientemente introducida __try_cmpxchg_user() para actualizar los bits A/D de la PTE invitada en lugar de mapear la PTE en el espacio de direcciones del kernel. La ruta VM_PFNMAP est\u00e1 rota ya que asume que vm_pgoff es la pfn base del rango VMA mapeado, lo cual es conceptualmente incorrecto ya que vm_pgoff es el desplazamiento relativo al archivo y no tiene nada que ver con la pfn. El horrible hack funcion\u00f3 para el caso de uso original (respaldar la memoria invitada con /dev/mem), pero conduce al acceso a pfn \"aleatorios\" para pr\u00e1cticamente cualquier otro caso VM_PFNMAP."}], "id": "CVE-2022-49562", "lastModified": "2026-08-04T10:17:51.923", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-02-26T07:01:31.970", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/38b888911e8dc89b89d8147cfb1d2dbe6373bf78"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8089e5e1d18402fb8152d6b6815450a36fffa9b0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f122dfe4476890d60b8c679128cd2259ec96a24c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2023:2458", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-284.11.1.el9_2", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2023-05-09T00:00:00Z"}, {"advisory": "RHSA-2023:2458", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-284.11.1.el9_2", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2023-05-09T00:00:00Z"}], "bugzilla": {"description": "kernel: KVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits", "id": "2347787", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2347787"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nKVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits\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."], "name": "CVE-2022-49562", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-02-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49562\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49562\nhttps://lore.kernel.org/linux-cve-announce/2025022618-CVE-2022-49562-1d2c@gregkh/T"], "threat_severity": "Moderate"}

{}