138 lines
7.7 KiB
JSON
138 lines
7.7 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-2025-37996",
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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": "2025-04-16T04:51:23.976Z",
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"datePublished": "2025-05-29T13:15:54.956Z",
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"dateUpdated": "2026-08-05T11:58:48.143Z"
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},
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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": "2026-08-05T11:58:48.143Z"
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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 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."
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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 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 — 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 — 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 — 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."
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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/mmu.c"
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],
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"versions": [
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{
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"version": "fce886a6020734d6253c2c5a3bc285e385cc5496",
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"lessThan": "a26d50f8a4a5049e956984797b5d0dedea4bbb18",
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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": "fce886a6020734d6253c2c5a3bc285e385cc5496",
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"lessThan": "157dbc4a321f5bb6f8b6c724d12ba720a90f1a7c",
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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/mmu.c"
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],
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"versions": [
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{
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"version": "6.14",
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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": "6.14",
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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": "6.14.7",
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"lessThanOrEqual": "6.14.*",
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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": "6.15",
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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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"nodes": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.14",
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"versionEndExcluding": "6.14.7"
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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": "6.14",
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"versionEndExcluding": "6.15"
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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/a26d50f8a4a5049e956984797b5d0dedea4bbb18"
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},
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{
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"url": "https://git.kernel.org/stable/c/157dbc4a321f5bb6f8b6c724d12ba720a90f1a7c"
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}
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],
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"title": "KVM: arm64: Fix uninitialized memcache pointer in user_mem_abort()",
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"x_generator": {
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