143 lines
7.5 KiB
JSON
143 lines
7.5 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-2026-43388",
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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": "2026-05-01T14:12:56.006Z",
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"datePublished": "2026-05-08T14:21:33.966Z",
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"dateUpdated": "2026-05-11T22:23:37.300Z"
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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": "2026-05-11T22:23:37.300Z"
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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/damon/core: clear walk_control on inactive context in damos_walk()\n\ndamos_walk() sets ctx->walk_control to the caller-provided control\nstructure before checking whether the context is running. If the context\nis inactive (damon_is_running() returns false), the function returns\n-EINVAL without clearing ctx->walk_control. This leaves a dangling\npointer to a stack-allocated structure that will be freed when the caller\nreturns.\n\nThis is structurally identical to the bug fixed in commit f9132fbc2e83\n(\"mm/damon/core: remove call_control in inactive contexts\") for\ndamon_call(), which had the same pattern of linking a control object and\nreturning an error without unlinking it.\n\nThe dangling walk_control pointer can cause:\n1. Use-after-free if the context is later started and kdamond\n dereferences ctx->walk_control (e.g., in damos_walk_cancel()\n which writes to control->canceled and calls complete())\n2. Permanent -EBUSY from subsequent damos_walk() calls, since the\n stale pointer is non-NULL\n\nNonetheless, the real user impact is quite restrictive. The\nuse-after-free is impossible because there is no damos_walk() callers who\nstarts the context later. The permanent -EBUSY can actually confuse\nusers, as DAMON is not running. But the symptom is kept only while the\ncontext is turned off. Turning it on again will make DAMON internally\nuses a newly generated damon_ctx object that doesn't have the invalid\ndamos_walk_control pointer, so everything will work fine again.\n\nFix this by clearing ctx->walk_control under walk_control_lock before\nreturning -EINVAL, mirroring the fix pattern from f9132fbc2e83."
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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/damon/core.c"
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],
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"versions": [
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{
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"version": "bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61",
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"lessThan": "ce0aa47c963b8c3e5beace89e2b5a665a64b5b6b",
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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": "bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61",
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"lessThan": "9320c77134ab8d7701e20608bbf08517df4fa321",
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"status": "affected",
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"versionType": "git"
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},
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{
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"lessThan": "d210fdcac9c0d1380eab448aebc93f602c1cd4e6",
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"status": "affected",
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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/damon/core.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": "6.18.19",
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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": "6.19.9",
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"lessThanOrEqual": "6.19.*",
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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",
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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": "6.14",
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"versionEndExcluding": "6.18.19"
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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": "6.19.9"
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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": "7.0"
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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/ce0aa47c963b8c3e5beace89e2b5a665a64b5b6b"
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},
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{
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"url": "https://git.kernel.org/stable/c/9320c77134ab8d7701e20608bbf08517df4fa321"
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},
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{
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"url": "https://git.kernel.org/stable/c/d210fdcac9c0d1380eab448aebc93f602c1cd4e6"
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}
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],
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"title": "mm/damon/core: clear walk_control on inactive context in damos_walk()",
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} |