CVE-2026-43482

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43482", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:56.012Z", "datePublished": "2026-05-13T15:08:29.739Z", "dateUpdated": "2026-05-13T15:08:29.739Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-13T15:08:29.739Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Disable preemption between scx_claim_exit() and kicking helper work\n\nscx_claim_exit() atomically sets exit_kind, which prevents scx_error() from\ntriggering further error handling. After claiming exit, the caller must kick\nthe helper kthread work which initiates bypass mode and teardown.\n\nIf the calling task gets preempted between claiming exit and kicking the\nhelper work, and the BPF scheduler fails to schedule it back (since error\nhandling is now disabled), the helper work is never queued, bypass mode\nnever activates, tasks stop being dispatched, and the system wedges.\n\nDisable preemption across scx_claim_exit() and the subsequent work kicking\nin all callers - scx_disable() and scx_vexit(). Add\nlockdep_assert_preemption_disabled() to scx_claim_exit() to enforce the\nrequirement."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/sched/ext.c"], "versions": [{"version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f", "lessThan": "41423912f7ac7494ccd6eef411227b4efce740e0", "status": "affected", "versionType": "git"}, {"version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f", "lessThan": "522acaae34aa7e05859260056b39c7c030592a0c", "status": "affected", "versionType": "git"}, {"version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f", "lessThan": "5131dbec2c10961b34f844bc30b400c3fa0bcc72", "status": "affected", "versionType": "git"}, {"version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f", "lessThan": "83236b2e43dba00bee5b82eb5758816b1a674f6a", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/sched/ext.c"], "versions": [{"version": "6.12", "status": "affected"}, {"version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.20", "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": "6.12", "versionEndExcluding": "6.12.78"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.18.20"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.19.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/41423912f7ac7494ccd6eef411227b4efce740e0"}, {"url": "https://git.kernel.org/stable/c/522acaae34aa7e05859260056b39c7c030592a0c"}, {"url": "https://git.kernel.org/stable/c/5131dbec2c10961b34f844bc30b400c3fa0bcc72"}, {"url": "https://git.kernel.org/stable/c/83236b2e43dba00bee5b82eb5758816b1a674f6a"}], "title": "sched_ext: Disable preemption between scx_claim_exit() and kicking helper work", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/sched/ext.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "41423912f7ac7494ccd6eef411227b4efce740e0", "status": "affected", "version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f", "versionType": "git"}, {"lessThan": "522acaae34aa7e05859260056b39c7c030592a0c", "status": "affected", "version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f", "versionType": "git"}, {"lessThan": "5131dbec2c10961b34f844bc30b400c3fa0bcc72", "status": "affected", "version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f", "versionType": "git"}, {"lessThan": "83236b2e43dba00bee5b82eb5758816b1a674f6a", "status": "affected", "version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/sched/ext.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.12"}, {"lessThan": "6.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.78", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.20", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "CF16B1DB-0D79-4F76-8B3C-57C79AB99F70", "versionEndExcluding": "6.12.78", "versionStartIncluding": "6.12", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E5571059-6552-48E7-9BEF-3E358C387171", "versionEndExcluding": "6.18.20", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E825E7C3-FEAC-4FD3-8A81-78D7387948C9", "versionEndExcluding": "6.19.9", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Disable preemption between scx_claim_exit() and kicking helper work\n\nscx_claim_exit() atomically sets exit_kind, which prevents scx_error() from\ntriggering further error handling. After claiming exit, the caller must kick\nthe helper kthread work which initiates bypass mode and teardown.\n\nIf the calling task gets preempted between claiming exit and kicking the\nhelper work, and the BPF scheduler fails to schedule it back (since error\nhandling is now disabled), the helper work is never queued, bypass mode\nnever activates, tasks stop being dispatched, and the system wedges.\n\nDisable preemption across scx_claim_exit() and the subsequent work kicking\nin all callers - scx_disable() and scx_vexit(). Add\nlockdep_assert_preemption_disabled() to scx_claim_exit() to enforce the\nrequirement."}], "id": "CVE-2026-43482", "lastModified": "2026-06-26T20:17:19.173", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-13T16:16:51.390", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/41423912f7ac7494ccd6eef411227b4efce740e0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5131dbec2c10961b34f844bc30b400c3fa0bcc72"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/522acaae34aa7e05859260056b39c7c030592a0c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/83236b2e43dba00bee5b82eb5758816b1a674f6a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: sched_ext: Disable preemption between scx_claim_exit() and kicking helper work", "id": "2477079", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2477079"}, "csaw": false, "cwe": "CWE-368", "details": ["A flaw was found in the Linux kernel's sched_ext component. If a task is preempted between the scx_claim_exit() function and the subsequent helper work activation, and the BPF (Berkeley Packet Filter) scheduler fails to reschedule it, the system can become unresponsive. This can lead to a denial of service, as tasks stop being dispatched and the system wedges."], "name": "CVE-2026-43482", "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": "2026-05-13T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43482\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43482\nhttps://lore.kernel.org/linux-cve-announce/2026051348-CVE-2026-43482-8a3e@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f0e1a0643a59bf1f922fa209cec86a170b784f3f,41423912f7ac7494ccd6eef411227b4efce740e0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f0e1a0643a59bf1f922fa209cec86a170b784f3f,522acaae34aa7e05859260056b39c7c030592a0c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f0e1a0643a59bf1f922fa209cec86a170b784f3f,5131dbec2c10961b34f844bc30b400c3fa0bcc72)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f0e1a0643a59bf1f922fa209cec86a170b784f3f,83236b2e43dba00bee5b82eb5758816b1a674f6a)"}}], "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": "semver", "value": "6.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.78,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.20,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.9,6.20.0)"}}, {"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": "2026-05-13T18:15:16.578275+00:00", "updated": "2026-08-14T03:00:04.611205+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}