CVE-2026-64226

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64226", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.771Z", "datePublished": "2026-07-24T15:23:10.388Z", "dateUpdated": "2026-08-05T12:40:11.672Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:40:11.672Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Avoid UAF in scx_root_enable_workfn() init failure path\n\nIn scx_root_enable_workfn(), put_task_struct(p) is called before scx_error()\ndereferences p->comm and p->pid. If the iterator's reference is the last\ndrop, the task is freed synchronously and the deref becomes a UAF.\n\nMove put_task_struct() past scx_error()."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable enable path is reached locally through bpf() struct_ops map preparation and BPF_LINK_CREATE, which invokes scx_enable() and scx_root_enable_workfn().\nAC:L - The attacker can make ops.init_task() return an error for a selected task while concurrently causing that task to exit, controlling both sides of the race and allowing repeated attempts.\nPR:L - Although ordinary attachment requires init-namespace CAP_BPF and CAP_PERFMON, BPF tokens can delegate the necessary struct_ops permissions to a non-init user namespace. Under the highest defensible deployment scenario, this is reachable by a locally authorized but non-administrative user.\nUI:N - The attacker can attach the scheduler and coordinate the target task's exit without requiring another user to take any action.\nS:U - The vulnerable sched_ext code and the affected kernel memory and execution context belong to the same kernel security authority.\nC:H - The freed task_struct is dereferenced through p->comm as a string and p->pid, potentially exposing reclaimed or adjacent slab contents through the sched_ext diagnostic buffer. Consistent with the required UAF guidance, confidentiality impact is High.\nI:H - The access occurs after a task_struct slab object has been freed and can be influenced through heap reuse and spraying. Applying the required higher-severity treatment for UAF conditions, potential memory-corruption and control-flow impact warrants High.\nA:H - The stale string dereference can cause a KASAN failure, invalid-memory access, kernel oops, or panic, and the attacker can repeat the controlled failure-and-exit sequence."}]}], "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": "cf396941901858b0de426cdcd3974eea6a02c98c", "status": "affected", "versionType": "git"}, {"version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f", "lessThan": "45c7c4e3db8b700307313c035ea08be829a7f21b", "status": "affected", "versionType": "git"}, {"version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f", "lessThan": "57e19ba3f58a67eb924022a5a60b67fd08e5cbbd", "status": "affected", "versionType": "git"}, {"version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f", "lessThan": "9a415cc53711f2238e0f0ca8a6bcc796c003b127", "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": "6.12.92", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.11", "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": "6.12", "versionEndExcluding": "6.12.92"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/cf396941901858b0de426cdcd3974eea6a02c98c"}, {"url": "https://git.kernel.org/stable/c/45c7c4e3db8b700307313c035ea08be829a7f21b"}, {"url": "https://git.kernel.org/stable/c/57e19ba3f58a67eb924022a5a60b67fd08e5cbbd"}, {"url": "https://git.kernel.org/stable/c/9a415cc53711f2238e0f0ca8a6bcc796c003b127"}], "title": "sched_ext: Avoid UAF in scx_root_enable_workfn() init failure path", "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": "cf396941901858b0de426cdcd3974eea6a02c98c", "status": "affected", "version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f", "versionType": "git"}, {"lessThan": "45c7c4e3db8b700307313c035ea08be829a7f21b", "status": "affected", "version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f", "versionType": "git"}, {"lessThan": "57e19ba3f58a67eb924022a5a60b67fd08e5cbbd", "status": "affected", "version": "f0e1a0643a59bf1f922fa209cec86a170b784f3f", "versionType": "git"}, {"lessThan": "9a415cc53711f2238e0f0ca8a6bcc796c003b127", "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": "6.12.92", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.34", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.11", "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": "9574AA5E-61DC-4F38-82BC-69F89AA7593C", "versionEndExcluding": "6.12.92", "versionStartIncluding": "6.12", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A4B1EF6D-18D7-4838-BC37-7499D5DCC3C0", "versionEndExcluding": "6.18.34", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0520D091-FC52-4A50-AF07-70AE7D08B750", "versionEndExcluding": "7.0.11", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*", "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*", "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Avoid UAF in scx_root_enable_workfn() init failure path\n\nIn scx_root_enable_workfn(), put_task_struct(p) is called before scx_error()\ndereferences p->comm and p->pid. If the iterator's reference is the last\ndrop, the task is freed synchronously and the deref becomes a UAF.\n\nMove put_task_struct() past scx_error()."}], "id": "CVE-2026-64226", "lastModified": "2026-08-13T12:01:44.860", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-24T16:16:51.673", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/45c7c4e3db8b700307313c035ea08be829a7f21b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/57e19ba3f58a67eb924022a5a60b67fd08e5cbbd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9a415cc53711f2238e0f0ca8a6bcc796c003b127"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cf396941901858b0de426cdcd3974eea6a02c98c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: sched_ext: Avoid UAF in scx_root_enable_workfn() init failure path", "id": "2506787", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506787"}, "csaw": false, "cwe": "CWE-825", "details": ["No description is available for this CVE."], "name": "CVE-2026-64226", "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": "2026-07-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64226\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64226\nhttps://lore.kernel.org/linux-cve-announce/2026072417-CVE-2026-64226-590d@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f0e1a0643a59bf1f922fa209cec86a170b784f3f,cf396941901858b0de426cdcd3974eea6a02c98c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f0e1a0643a59bf1f922fa209cec86a170b784f3f,45c7c4e3db8b700307313c035ea08be829a7f21b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f0e1a0643a59bf1f922fa209cec86a170b784f3f,57e19ba3f58a67eb924022a5a60b67fd08e5cbbd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f0e1a0643a59bf1f922fa209cec86a170b784f3f,9a415cc53711f2238e0f0ca8a6bcc796c003b127)"}}], "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": "6.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.92,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.34,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.11,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[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": "2026-07-24T21:45:02.738506+00:00", "updated": "2026-08-13T15:00:04.244369+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}