159 lines
8.5 KiB
JSON
159 lines
8.5 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-2026-46029",
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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": "2026-05-13T15:03:33.093Z",
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"datePublished": "2026-05-27T12:56:38.376Z",
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"dateUpdated": "2026-08-05T12:29:13.390Z"
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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": "2026-08-05T12:29:13.390Z"
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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\nmm/slab: return NULL early from kmalloc_nolock() in NMI on UP\n\nOn UP kernels (!CONFIG_SMP), spin_trylock() is a no-op that\nunconditionally succeeds even when the lock is already held. As a\nresult, kmalloc_nolock() called from NMI context can re-enter the slab\nallocator and acquire n->list_lock that the interrupted context is\nalready holding, corrupting slab state.\n\nWith CONFIG_DEBUG_SPINLOCK on UP, the following BUG is triggered with\nthe slub_kunit test module:\n\n BUG: spinlock trylock failure on UP on CPU#0, kunit_try_catch/243\n [...]\n Call Trace:\n <NMI>\n dump_stack_lvl+0x3f/0x60\n do_raw_spin_trylock+0x41/0x50\n _raw_spin_trylock+0x24/0x50\n get_from_partial_node+0x120/0x4d0\n ___slab_alloc+0x8a/0x4c0\n kmalloc_nolock_noprof+0x164/0x310\n [...]\n </NMI>\n\nFix this by returning NULL early when invoked from NMI on a UP kernel."
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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:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7,
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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 only callers reaching NMI-context kmalloc_nolock() are local BPF programs (perf events) or in-kernel module code; there is no remote/network path to this allocator routine.\nAC:H - The bug only manifests on rare non-default uniprocessor (!CONFIG_SMP) kernels, and additionally requires the NMI to fire during the narrow window in which the interrupted context holds n->list_lock — both conditions are beyond the attacker's control.\nPR:L - Running code in NMI context that calls kmalloc_nolock() requires attaching a BPF program to a hardware perf event (CAP_BPF/CAP_PERFMON), which are sub-root capabilities delegable to confined tracing/profiling service accounts rather than full root.\nUI:N - Triggering the NMI-context allocation requires no action from any other user or victim.\nS:U - The slab-state corruption stays within the kernel's own security authority; no cross-boundary (VM/IOMMU) escape is involved.\nC:H - Re-entrant slab list/freelist corruption is a powerful primitive that can produce overlapping allocations and be leveraged for kernel memory disclosure.\nI:H - Corruption of SLUB partial-list/freelist metadata is a well-known basis for arbitrary-write primitives and control-flow hijacking.\nA:H - The corrupted slab state (or the DEBUG_SPINLOCK BUG) leads to kernel oops/panic, a full availability loss."
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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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"mm/slub.c"
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],
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"versions": [
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{
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"version": "af92793e52c3a99b828ed4bdd277fd3e11c18d08",
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"lessThan": "a8d95d274be241ad21f6523bf2d6ba0d7d7e46b7",
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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": "af92793e52c3a99b828ed4bdd277fd3e11c18d08",
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"lessThan": "d66553204a15bdb257d9ef8aca1e12f5fbb910b2",
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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": "af92793e52c3a99b828ed4bdd277fd3e11c18d08",
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"lessThan": "5b31044e649e3e54c2caef135c09b371c2fbcd08",
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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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"mm/slub.c"
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],
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"versions": [
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{
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"version": "6.18",
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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": "6.18",
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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": "6.18.27",
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"lessThanOrEqual": "6.18.*",
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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": "7.0.4",
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"lessThanOrEqual": "7.0.*",
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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": "7.1",
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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": "6.18",
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"versionEndExcluding": "6.18.27"
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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": "6.18",
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"versionEndExcluding": "7.0.4"
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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": "6.18",
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"versionEndExcluding": "7.1"
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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/a8d95d274be241ad21f6523bf2d6ba0d7d7e46b7"
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},
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{
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"url": "https://git.kernel.org/stable/c/d66553204a15bdb257d9ef8aca1e12f5fbb910b2"
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},
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{
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"url": "https://git.kernel.org/stable/c/5b31044e649e3e54c2caef135c09b371c2fbcd08"
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}
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],
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"title": "mm/slab: return NULL early from kmalloc_nolock() in NMI on UP",
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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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} |