180 lines
9.4 KiB
JSON
180 lines
9.4 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-2026-46093",
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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": "2026-05-13T15:03:33.097Z",
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"datePublished": "2026-05-27T12:58:43.458Z",
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"dateUpdated": "2026-08-05T12:29:35.424Z"
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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": "2026-08-05T12:29:35.424Z"
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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/vmalloc: take vmap_purge_lock in shrinker\n\ndecay_va_pool_node() can be invoked concurrently from two paths:\n__purge_vmap_area_lazy() when pools are being purged, and the shrinker via\nvmap_node_shrink_scan().\n\nHowever, decay_va_pool_node() is not safe to run concurrently, and the\nshrinker path currently lacks serialization, leading to races and possible\nleaks.\n\nProtect decay_va_pool_node() by taking vmap_purge_lock in the shrinker\npath to ensure serialization with purge users."
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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 - The vulnerable race is in core MM internals (vmap pool decay) reached only via local memory-management activity — inducing vmalloc/vfree churn (purge path) and memory pressure (shrinker path). No network-delivered data reaches the vulnerable function.\nAC:L - An unprivileged attacker controls both sides: one thread forces direct reclaim (shrinker→decay) while another drives vmalloc/vfree churn past the lazy-free threshold (purge→decay), and both can loop indefinitely to repeatedly attempt and win the narrow race.\nPR:L - Any unprivileged local process can allocate/free memory and induce reclaim; no capabilities or root are required to drive either racing path.\nUI:N - The race is triggered entirely by the attacker's own memory activity; no victim action is needed.\nS:U - The corruption stays within the kernel's own memory-management structures and does not cross into another security authority (no VM/IOMMU boundary escape).\nC:H - The data race corrupts the vmap pool linked list and free-area tree metadata; per kernel guidance, allocator memory corruption can be leveraged to read freed/adjacent kernel memory.\nI:H - Concurrent unserialized list_replace_init plus double-merge of vmap_area objects into the global free tree corrupts kernel free-list/tree state, a write/corruption primitive over allocator metadata.\nA:H - Corrupted lists and inconsistent len accounting (and the documented leaks) cause kernel crashes/oops and resource exhaustion when the corrupted pool is subsequently traversed or reused."
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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/vmalloc.c"
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],
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"versions": [
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{
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"version": "7679ba6b36dbb300b757b672d6a32a606499e14b",
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"lessThan": "c15ff206ba78820bf2873d0c668a882e99f4b631",
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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": "7679ba6b36dbb300b757b672d6a32a606499e14b",
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"lessThan": "687ccdf582169cd680aeaf24cc953807c4cd4345",
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"status": "affected",
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]
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},
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{
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"product": "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/vmalloc.c"
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],
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"versions": [
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{
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"version": "6.9",
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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": "6.9",
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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": "6.12.96",
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"lessThanOrEqual": "6.12.*",
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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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"nodes": [
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"operator": "OR",
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"negate": false,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.9",
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"versionEndExcluding": "6.12.96"
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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/c15ff206ba78820bf2873d0c668a882e99f4b631"
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},
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{
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"url": "https://git.kernel.org/stable/c/687ccdf582169cd680aeaf24cc953807c4cd4345"
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},
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{
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"url": "https://git.kernel.org/stable/c/12f2341b4c235d5593a433abac201c1c6725787f"
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},
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{
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"url": "https://git.kernel.org/stable/c/ec05f51f1e65bce95528543eb73fda56fd201d94"
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}
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],
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"title": "mm/vmalloc: take vmap_purge_lock in shrinker",
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