CVE-2025-37996

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-37996", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.976Z", "datePublished": "2025-05-29T13:15:54.956Z", "dateUpdated": "2026-08-05T11:58:48.143Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:58:48.143Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Fix uninitialized memcache pointer in user_mem_abort()\n\nCommit fce886a60207 (\"KVM: arm64: Plumb the pKVM MMU in KVM\") made the\ninitialization of the local memcache variable in user_mem_abort()\nconditional, leaving a codepath where it is used uninitialized via\nkvm_pgtable_stage2_map().\n\nThis can fail on any path that requires a stage-2 allocation\nwithout transition via a permission fault or dirty logging.\n\nFix this by making sure that memcache is always valid."}], "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 code is the host kernel's stage-2 fault handler, reached through guest execution under KVM_RUN (or directly by a local user with /dev/kvm who builds their own VM); there is no network-facing path.\nAC:L - No race or unpredictable precondition is involved \u2014 an attacker controlling a guest can deterministically arrange a huge-block stage-2 mapping and then take a non-write permission fault (instruction fetch, or an NV shadow-S2 granule mismatch) so that `memcache` is consumed uninitialized on every attempt.\nPR:L - The attacker only needs code execution inside a guest VM, or unprivileged access to /dev/kvm on the host (commonly group- or world-accessible on Android, desktops and libvirt hosts); no host root is required.\nUI:N - The fault is raised by the guest's own memory access during normal vCPU execution, with no action needed from the host operator or any other user.\nS:C - The bug lets a guest corrupt host-kernel memory through the stage-2 page-table allocator, crossing from the VM's security authority into the hypervisor host \u2014 a guest-to-host boundary violation.\nC:H - `kvm_mmu_memory_cache_alloc()` performs `mc->objects[--mc->nobjs]` through the garbage pointer, an attacker-influenceable arbitrary read whose result is then mapped into the guest's stage-2 tables, exposing host memory contents to the guest.\nI:H - The uninitialized pointer yields wild writes (`--mc->nobjs`, and under pKVM `swap(mapping, cache->mapping)` followed by `mapping->gfn/pfn` stores) and causes arbitrary host memory to be installed as a guest stage-2 page table with matching `get_page`/`put_page` refcount manipulation \u2014 a host memory-corruption and control-flow-hijack primitive.\nA:H - In the ordinary case the wild dereference (or the `BUG_ON(!p)` in `kvm_mmu_memory_cache_alloc()`) oopses in the vCPU thread while holding the KVM fault lock, panicking the host kernel and taking down every VM on the machine."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/arm64/kvm/mmu.c"], "versions": [{"version": "fce886a6020734d6253c2c5a3bc285e385cc5496", "lessThan": "a26d50f8a4a5049e956984797b5d0dedea4bbb18", "status": "affected", "versionType": "git"}, {"version": "fce886a6020734d6253c2c5a3bc285e385cc5496", "lessThan": "157dbc4a321f5bb6f8b6c724d12ba720a90f1a7c", "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/kvm/mmu.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.14.7", "lessThanOrEqual": "6.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15", "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": "6.14", "versionEndExcluding": "6.14.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/a26d50f8a4a5049e956984797b5d0dedea4bbb18"}, {"url": "https://git.kernel.org/stable/c/157dbc4a321f5bb6f8b6c724d12ba720a90f1a7c"}], "title": "KVM: arm64: Fix uninitialized memcache pointer in user_mem_abort()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/arm64/kvm/mmu.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "a26d50f8a4a5049e956984797b5d0dedea4bbb18", "status": "affected", "version": "fce886a6020734d6253c2c5a3bc285e385cc5496", "versionType": "git"}, {"lessThan": "157dbc4a321f5bb6f8b6c724d12ba720a90f1a7c", "status": "affected", "version": "fce886a6020734d6253c2c5a3bc285e385cc5496", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/arm64/kvm/mmu.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"lessThan": "6.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.14.*", "status": "unaffected", "version": "6.14.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.15", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "1A5B4961-384D-4769-BF75-B020B67832ED", "versionEndExcluding": "6.14.7", "versionStartIncluding": "6.14", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*", "matchCriteriaId": "8D465631-2980-487A-8E65-40AE2B9F8ED1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:*", "matchCriteriaId": "4C9D071F-B28E-46EC-AC61-22B913390211", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:*", "matchCriteriaId": "13FC0DDE-E513-465E-9E81-515702D49B74", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc4:*:*:*:*:*:*", "matchCriteriaId": "8C7B5B0E-4EEB-48F5-B4CF-0935A7633845", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc5:*:*:*:*:*:*", "matchCriteriaId": "2D240580-3048-49B2-9E27-F115A9DF8224", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Fix uninitialized memcache pointer in user_mem_abort()\n\nCommit fce886a60207 (\"KVM: arm64: Plumb the pKVM MMU in KVM\") made the\ninitialization of the local memcache variable in user_mem_abort()\nconditional, leaving a codepath where it is used uninitialized via\nkvm_pgtable_stage2_map().\n\nThis can fail on any path that requires a stage-2 allocation\nwithout transition via a permission fault or dirty logging.\n\nFix this by making sure that memcache is always valid."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: arm64: Correcci\u00f3n de un puntero de memcache no inicializado en user_mem_abort(). El commit fce886a60207 (\"KVM: arm64: Conectar la MMU pKVM en KVM\") hizo que la inicializaci\u00f3n de la variable de memcache local en user_mem_abort() fuera condicional, dejando la ruta de c\u00f3digo donde se usa sin inicializar mediante kvm_pgtable_stage2_map(). Esto puede fallar en cualquier ruta que requiera una asignaci\u00f3n de etapa 2 sin transici\u00f3n debido a un fallo de permiso o un registro incorrecto. Para solucionar esto, aseg\u00farese de que la memcache sea siempre v\u00e1lida."}], "id": "CVE-2025-37996", "lastModified": "2026-07-30T06:22:42.973", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 6.0, "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": "2025-05-29T14:15:36.183", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/157dbc4a321f5bb6f8b6c724d12ba720a90f1a7c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a26d50f8a4a5049e956984797b5d0dedea4bbb18"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-908"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: KVM: arm64: Fix uninitialized memcache pointer in user_mem_abort()", "id": "2369189", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2369189"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nKVM: arm64: Fix uninitialized memcache pointer in user_mem_abort()\nCommit fce886a60207 (\"KVM: arm64: Plumb the pKVM MMU in KVM\") made the\ninitialization of the local memcache variable in user_mem_abort()\nconditional, leaving a codepath where it is used uninitialized via\nkvm_pgtable_stage2_map().\nThis can fail on any path that requires a stage-2 allocation\nwithout transition via a permission fault or dirty logging.\nFix this by making sure that memcache is always valid."], "name": "CVE-2025-37996", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-05-29T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-37996\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-37996\nhttps://lore.kernel.org/linux-cve-announce/2025052902-CVE-2025-37996-0018@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-06-24T09:44:22.618482+00:00", "updated": "2025-06-24T09:44:22.618530+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}