CVE-2026-89759

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89759", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.763Z", "datePublished": "2026-09-11T19:47:01.313Z", "dateUpdated": "2026-10-30T12:32:57.075Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:32:57.075Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/kmemleak: avoid soft lockup when scanning task stacks\n\nPatch series \"mm/kmemleak: avoid soft lockup when scanning task\", v3.\n\nkmemleak_scan() scans every task stack under one rcu_read_lock() with no\nreschedule point, which can trip the soft lockup watchdog on hosts with\nvery many threads.\n\nThat prints the following message, depending on the workload+host\nconfiguration:\n\n watchdog: BUG: soft lockup - CPU#35 stuck for 22s! [kmemleak:537]\n scan_block\n kmemleak_scan\n kmemleak_scan_thread\n kthread\n\nPatch 1 walks the tasks with find_ge_pid() so the scan reschedules between\ntasks\n\nPatches 2-3 let the scan loops stop early once a scan is interrupted.\n\n\nThis patch (of 3):\n\nkmemleak_scan() walks every thread and scans its kernel stack under a\nsingle rcu_read_lock() with no reschedule point. On a host with very many\nthreads -- amplified by KASAN/lockdep in debug builds -- this loop can hog\na CPU long enough to trip the soft lockup watchdog:\n\n watchdog: BUG: soft lockup - CPU#35 stuck for 22s! [kmemleak:537]\n scan_block\n kmemleak_scan\n kmemleak_scan_thread\n kthread\n\nA cond_resched() cannot be added directly: the loop runs inside an RCU\nread-side critical section.\n\nWalk the tasks one PID at a time with find_ge_pid(), taking the RCU read\nlock only to look up and pin each task. The stack is then scanned with no\nlock held, so cond_resched() runs between tasks and the scan stops early\non scan_should_stop(). This follows the next_tgid()/task_seq_get_next()\niteration pattern and keeps each RCU critical section short."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/kmemleak.c"], "versions": [{"version": "c4b28963fd79457315783b3b0f21c01eb88cfdc1", "lessThan": "2567818c2776d0a820506c3612261d9e24af7164", "status": "affected", "versionType": "git"}, {"version": "c4b28963fd79457315783b3b0f21c01eb88cfdc1", "lessThan": "f1cd6c4c35243377882c47236281d03ee3be6eeb", "status": "affected", "versionType": "git"}, {"version": "c4b28963fd79457315783b3b0f21c01eb88cfdc1", "lessThan": "9a1b12c06c192290b8479de48f66f1e75d89c4b7", "status": "affected", "versionType": "git"}, {"version": "c4b28963fd79457315783b3b0f21c01eb88cfdc1", "lessThan": "3fc8044251de21555fb02c365fa681bab8b0db55", "status": "affected", "versionType": "git"}, {"version": "c4b28963fd79457315783b3b0f21c01eb88cfdc1", "lessThan": "1838c704bcb4fd3556cf67513c6f97a39099e35c", "status": "affected", "versionType": "git"}, {"version": "c4b28963fd79457315783b3b0f21c01eb88cfdc1", "lessThan": "5d10d4e19e6daa487f0cd0ea6cba472325de92f9", "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/kmemleak.c"], "versions": [{"version": "5.10", "status": "affected"}, {"version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "5.10", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2567818c2776d0a820506c3612261d9e24af7164"}, {"url": "https://git.kernel.org/stable/c/f1cd6c4c35243377882c47236281d03ee3be6eeb"}, {"url": "https://git.kernel.org/stable/c/9a1b12c06c192290b8479de48f66f1e75d89c4b7"}, {"url": "https://git.kernel.org/stable/c/3fc8044251de21555fb02c365fa681bab8b0db55"}, {"url": "https://git.kernel.org/stable/c/1838c704bcb4fd3556cf67513c6f97a39099e35c"}, {"url": "https://git.kernel.org/stable/c/5d10d4e19e6daa487f0cd0ea6cba472325de92f9"}], "title": "mm/kmemleak: avoid soft lockup when scanning task stacks", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["mm/kmemleak.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "2567818c2776d0a820506c3612261d9e24af7164", "status": "affected", "version": "c4b28963fd79457315783b3b0f21c01eb88cfdc1", "versionType": "git"}, {"lessThan": "f1cd6c4c35243377882c47236281d03ee3be6eeb", "status": "affected", "version": "c4b28963fd79457315783b3b0f21c01eb88cfdc1", "versionType": "git"}, {"lessThan": "9a1b12c06c192290b8479de48f66f1e75d89c4b7", "status": "affected", "version": "c4b28963fd79457315783b3b0f21c01eb88cfdc1", "versionType": "git"}, {"lessThan": "3fc8044251de21555fb02c365fa681bab8b0db55", "status": "affected", "version": "c4b28963fd79457315783b3b0f21c01eb88cfdc1", "versionType": "git"}, {"lessThan": "1838c704bcb4fd3556cf67513c6f97a39099e35c", "status": "affected", "version": "c4b28963fd79457315783b3b0f21c01eb88cfdc1", "versionType": "git"}, {"lessThan": "5d10d4e19e6daa487f0cd0ea6cba472325de92f9", "status": "affected", "version": "c4b28963fd79457315783b3b0f21c01eb88cfdc1", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["mm/kmemleak.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.10"}, {"lessThan": "5.10", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/kmemleak: avoid soft lockup when scanning task stacks\n\nPatch series \"mm/kmemleak: avoid soft lockup when scanning task\", v3.\n\nkmemleak_scan() scans every task stack under one rcu_read_lock() with no\nreschedule point, which can trip the soft lockup watchdog on hosts with\nvery many threads.\n\nThat prints the following message, depending on the workload+host\nconfiguration:\n\n watchdog: BUG: soft lockup - CPU#35 stuck for 22s! [kmemleak:537]\n scan_block\n kmemleak_scan\n kmemleak_scan_thread\n kthread\n\nPatch 1 walks the tasks with find_ge_pid() so the scan reschedules between\ntasks\n\nPatches 2-3 let the scan loops stop early once a scan is interrupted.\n\n\nThis patch (of 3):\n\nkmemleak_scan() walks every thread and scans its kernel stack under a\nsingle rcu_read_lock() with no reschedule point. On a host with very many\nthreads -- amplified by KASAN/lockdep in debug builds -- this loop can hog\na CPU long enough to trip the soft lockup watchdog:\n\n watchdog: BUG: soft lockup - CPU#35 stuck for 22s! [kmemleak:537]\n scan_block\n kmemleak_scan\n kmemleak_scan_thread\n kthread\n\nA cond_resched() cannot be added directly: the loop runs inside an RCU\nread-side critical section.\n\nWalk the tasks one PID at a time with find_ge_pid(), taking the RCU read\nlock only to look up and pin each task. The stack is then scanned with no\nlock held, so cond_resched() runs between tasks and the scan stops early\non scan_should_stop(). This follows the next_tgid()/task_seq_get_next()\niteration pattern and keeps each RCU critical section short."}], "id": "CVE-2026-89759", "lastModified": "2026-10-30T13:20:28.370", "metrics": {}, "published": "2026-09-11T20:20:06.997", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1838c704bcb4fd3556cf67513c6f97a39099e35c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2567818c2776d0a820506c3612261d9e24af7164"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3fc8044251de21555fb02c365fa681bab8b0db55"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5d10d4e19e6daa487f0cd0ea6cba472325de92f9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9a1b12c06c192290b8479de48f66f1e75d89c4b7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f1cd6c4c35243377882c47236281d03ee3be6eeb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Denial of Service due to kmemleak soft lockup when scanning task stacks", "id": "2532495", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532495"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1050", "details": ["A flaw was found in the Linux kernel's memory leak detector (kmemleak). When kmemleak_scan() attempts to scan task stacks on systems with a large number of threads, it can hold a CPU for an extended period without allowing other processes to run. This can lead to a 'soft lockup,' where the system becomes unresponsive, effectively causing a Denial of Service (DoS)."], "name": "CVE-2026-89759", "public_date": "2026-09-11T19:47:01Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89759\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89759\nhttps://git.kernel.org/stable/c/1838c704bcb4fd3556cf67513c6f97a39099e35c\nhttps://git.kernel.org/stable/c/3fc8044251de21555fb02c365fa681bab8b0db55\nhttps://git.kernel.org/stable/c/5d10d4e19e6daa487f0cd0ea6cba472325de92f9\nhttps://git.kernel.org/stable/c/9a1b12c06c192290b8479de48f66f1e75d89c4b7"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c4b28963fd79457315783b3b0f21c01eb88cfdc1,9a1b12c06c192290b8479de48f66f1e75d89c4b7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c4b28963fd79457315783b3b0f21c01eb88cfdc1,3fc8044251de21555fb02c365fa681bab8b0db55)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c4b28963fd79457315783b3b0f21c01eb88cfdc1,1838c704bcb4fd3556cf67513c6f97a39099e35c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c4b28963fd79457315783b3b0f21c01eb88cfdc1,5d10d4e19e6daa487f0cd0ea6cba472325de92f9)"}}], "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": "5.10"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.10)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-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": "2026-09-12T08:00:11.013085+00:00", "updated": "2026-09-15T19:15:16.160900+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}