{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43388", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:56.006Z", "datePublished": "2026-05-08T14:21:33.966Z", "dateUpdated": "2026-05-08T14:21:33.966Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-08T14:21:33.966Z"}, "descriptions": [{"lang": "en", "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\u00a0 \u00a0dereferences ctx->walk_control (e.g., in damos_walk_cancel()\n\u00a0 \u00a0which writes to control->canceled and calls complete())\n2. Permanent -EBUSY from subsequent damos_walk() calls, since the\n\u00a0 \u00a0stale 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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/damon/core.c"], "versions": [{"version": "bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61", "lessThan": "ce0aa47c963b8c3e5beace89e2b5a665a64b5b6b", "status": "affected", "versionType": "git"}, {"version": "bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61", "lessThan": "9320c77134ab8d7701e20608bbf08517df4fa321", "status": "affected", "versionType": "git"}, {"version": "bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61", "lessThan": "d210fdcac9c0d1380eab448aebc93f602c1cd4e6", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/damon/core.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.19", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.9", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.18.19"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.19.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/ce0aa47c963b8c3e5beace89e2b5a665a64b5b6b"}, {"url": "https://git.kernel.org/stable/c/9320c77134ab8d7701e20608bbf08517df4fa321"}, {"url": "https://git.kernel.org/stable/c/d210fdcac9c0d1380eab448aebc93f602c1cd4e6"}], "title": "mm/damon/core: clear walk_control on inactive context in damos_walk()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "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\u00a0 \u00a0dereferences ctx->walk_control (e.g., in damos_walk_cancel()\n\u00a0 \u00a0which writes to control->canceled and calls complete())\n2. Permanent -EBUSY from subsequent damos_walk() calls, since the\n\u00a0 \u00a0stale 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."}], "id": "CVE-2026-43388", "lastModified": "2026-05-08T15:16:50.180", "metrics": {}, "published": "2026-05-08T15:16:50.180", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9320c77134ab8d7701e20608bbf08517df4fa321"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ce0aa47c963b8c3e5beace89e2b5a665a64b5b6b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d210fdcac9c0d1380eab448aebc93f602c1cd4e6"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61, ce0aa47c963b8c3e5beace89e2b5a665a64b5b6b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61, 9320c77134ab8d7701e20608bbf08517df4fa321)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61, d210fdcac9c0d1380eab448aebc93f602c1cd4e6)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "calver", "value": "6.14"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.19,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.19.9,6.19.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-08T17:45:12.872035+00:00", "updated": "2026-05-08T18:30:06.352358+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}