CVE-2026-46008

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-46008", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.092Z", "datePublished": "2026-05-27T12:56:08.315Z", "dateUpdated": "2026-10-21T12:41:10.467Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:41:10.467Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/core: fix damos_walk() vs kdamond_fn() exit race\n\nWhen kdamond_fn() main loop is finished, the function cancels remaining\ndamos_walk() request and unset the damon_ctx->kdamond so that API callers\nand API functions themselves can show the context is terminated. \ndamos_walk() adds the caller's request to the queue first. After that, it\nshows if the kdamond of the damon_ctx is still running (damon_ctx->kdamond\nis set). Only if the kdamond is running, damos_walk() starts waiting for\nthe kdamond's handling of the newly added request.\n\nThe damos_walk() requests registration and damon_ctx->kdamond unset are\nprotected by different mutexes, though. Hence, damos_walk() could race\nwith damon_ctx->kdamond unset, and result in deadlocks.\n\nFor example, let's suppose kdamond successfully finished the damow_walk()\nrequest cancelling. Right after that, damos_walk() is called for the\ncontext. It registers the new request, and shows the context is still\nrunning, because damon_ctx->kdamond unset is not yet done. Hence the\ndamos_walk() caller starts waiting for the handling of the request. \nHowever, the kdamond is already on the termination steps, so it never\nhandles the new request. As a result, the damos_walk() caller thread\ninfinitely waits.\n\nFix this by introducing another damon_ctx field, namely\nwalk_control_obsolete. It is protected by the\ndamon_ctx->walk_control_lock, which protects damos_walk() request\nregistration. Initialize (unset) it in kdamond_fn() before letting\ndamon_start() returns and set it just before the cancelling of the\nremaining damos_walk() request is executed. damos_walk() reads the\nobsolete field under the lock and avoids adding a new request.\n\nAfter this change, only requests that are guaranteed to be handled or\ncancelled are registered. Hence the after-registration DAMON context\ntermination check is no longer needed. Remove it together.\n\nThe issue is found by sashiko [1]."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/damon.h", "mm/damon/core.c"], "versions": [{"version": "bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61", "lessThan": "93a7f297362deac614ce3dbbba73ff2ba31aaca3", "status": "affected", "versionType": "git"}, {"version": "bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61", "lessThan": "0ba956a239ba6e3fae8555d3660e22e675be63b5", "status": "affected", "versionType": "git"}, {"version": "bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61", "lessThan": "33c3f6c2b48cd84b441dba1ee3e62290e53930f4", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/damon.h", "mm/damon/core.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.58", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.4", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "6.18.58"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.0.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/93a7f297362deac614ce3dbbba73ff2ba31aaca3"}, {"url": "https://git.kernel.org/stable/c/0ba956a239ba6e3fae8555d3660e22e675be63b5"}, {"url": "https://git.kernel.org/stable/c/33c3f6c2b48cd84b441dba1ee3e62290e53930f4"}], "title": "mm/damon/core: fix damos_walk() vs kdamond_fn() exit race", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["include/linux/damon.h", "mm/damon/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "93a7f297362deac614ce3dbbba73ff2ba31aaca3", "status": "affected", "version": "bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61", "versionType": "git"}, {"lessThan": "0ba956a239ba6e3fae8555d3660e22e675be63b5", "status": "affected", "version": "bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61", "versionType": "git"}, {"lessThan": "33c3f6c2b48cd84b441dba1ee3e62290e53930f4", "status": "affected", "version": "bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["include/linux/damon.h", "mm/damon/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"lessThan": "6.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.58", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "241B688D-8E14-4010-AB9E-D5F5E52FA273", "versionEndExcluding": "7.0.4", "versionStartIncluding": "6.14", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/core: fix damos_walk() vs kdamond_fn() exit race\n\nWhen kdamond_fn() main loop is finished, the function cancels remaining\ndamos_walk() request and unset the damon_ctx->kdamond so that API callers\nand API functions themselves can show the context is terminated. \ndamos_walk() adds the caller's request to the queue first. After that, it\nshows if the kdamond of the damon_ctx is still running (damon_ctx->kdamond\nis set). Only if the kdamond is running, damos_walk() starts waiting for\nthe kdamond's handling of the newly added request.\n\nThe damos_walk() requests registration and damon_ctx->kdamond unset are\nprotected by different mutexes, though. Hence, damos_walk() could race\nwith damon_ctx->kdamond unset, and result in deadlocks.\n\nFor example, let's suppose kdamond successfully finished the damow_walk()\nrequest cancelling. Right after that, damos_walk() is called for the\ncontext. It registers the new request, and shows the context is still\nrunning, because damon_ctx->kdamond unset is not yet done. Hence the\ndamos_walk() caller starts waiting for the handling of the request. \nHowever, the kdamond is already on the termination steps, so it never\nhandles the new request. As a result, the damos_walk() caller thread\ninfinitely waits.\n\nFix this by introducing another damon_ctx field, namely\nwalk_control_obsolete. It is protected by the\ndamon_ctx->walk_control_lock, which protects damos_walk() request\nregistration. Initialize (unset) it in kdamond_fn() before letting\ndamon_start() returns and set it just before the cancelling of the\nremaining damos_walk() request is executed. damos_walk() reads the\nobsolete field under the lock and avoids adding a new request.\n\nAfter this change, only requests that are guaranteed to be handled or\ncancelled are registered. Hence the after-registration DAMON context\ntermination check is no longer needed. Remove it together.\n\nThe issue is found by sashiko [1]."}], "id": "CVE-2026-46008", "lastModified": "2026-10-21T13:19:02.227", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-27T14:17:18.600", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0ba956a239ba6e3fae8555d3660e22e675be63b5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/33c3f6c2b48cd84b441dba1ee3e62290e53930f4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/93a7f297362deac614ce3dbbba73ff2ba31aaca3"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: mm/damon/core: fix damos_walk() vs kdamond_fn() exit race", "id": "2482026", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482026"}, "csaw": false, "cwe": "CWE-833", "details": ["A flaw was found in the Linux kernel's Data Access MONitor (DAMON) subsystem. A race condition exists in the memory management component, specifically during the exit process of `kdamond_fn()` and the registration of `damos_walk()` requests. This vulnerability allows a local attacker to trigger a deadlock, resulting in a Denial of Service (DoS) for the affected system."], "name": "CVE-2026-46008", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46008\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46008\nhttps://lore.kernel.org/linux-cve-announce/2026052743-CVE-2026-46008-aa99@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61,0ba956a239ba6e3fae8555d3660e22e675be63b5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61,33c3f6c2b48cd84b441dba1ee3e62290e53930f4)"}}], "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": "generic", "value": "6.14"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.4,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1-rc1,*]"}}], "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": "2026-05-27T17:00:17.661429+00:00", "updated": "2026-06-18T00:00:05.838614+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}