CVE-2026-99269

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-99269", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.404Z", "datePublished": "2026-11-03T11:48:18.333Z", "dateUpdated": "2026-11-03T19:14:42.052Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-11-03T19:14:42.052Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Wait for SCX_OPSS_DISPATCHING before moving tasks off DSQs\n\nA task can be found on a non-local DSQ while the CPU which dispatched it\nis still running ops.dequeue() and hasn't cleared SCX_OPSS_DISPATCHING.\nThe DSQ consume and move paths don't wait for the dispatch to finish and\ncan operate on the task concurrently with the dispatcher.\n\nCall scx_wait_dispatching() in scx_move_local_task_to_local_dsq(),\nunlink_dsq_and_switch_rq_lock() and move_task_between_dsqs() before they\noperate on the task. In scx_move_local_task_to_local_dsq(), wait before\nscx_resolve_local_dsq() as it may update p->scx.flags."}], "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 race is in scx_dispatch_enqueue() versus scx_move_local_task_to_local_dsq(), unlink_dsq_and_switch_rq_lock() and move_task_between_dsqs() in kernel/sched/ext/ext.c, reached locally by bpf(BPF_LINK_CREATE)->bpf_scx_reg() then scx_bpf_dsq_insert()/scx_bpf_dsq_move[_to_local](), or by __schedule()->pick_task_scx()->scx_dispatch_sched()->consume_global_dsq(); no remote protocol supplies the triggering state.\nAC:L - A loaded sched_ext program inserts a task onto a non-local DSQ so scx_dispatch_enqueue() drops dsq->lock while ops_state is still SCX_OPSS_DISPATCHING and runs ops.dequeue(), while another CPU consumes or moves that same task via scx_bpf_dsq_move_to_local()/scx_bpf_dsq_move() or consume_global_dsq(); the attacker drives both sides and can retry.\nPR:L - Enabling the scheduler takes bpf() BPF_PROG_LOAD of BPF_PROG_TYPE_STRUCT_OPS, which is_perfmon_prog_type() gates on bpf_token_capable(CAP_BPF) and CAP_PERFMON, then BPF_LINK_CREATE into bpf_scx_reg(); those capabilities are delegable into a user namespace with a BPF token, so this is not init-namespace root.\nUI:N - The attacker attaches their own sched_ext_ops, has scx_bpf_dsq_insert() place a task on a non-local DSQ, and consumes or moves it from another CPU; no victim mount, file open, or other user action is required.\nS:U - The concurrent updates of p->scx.flags, p->scx.ops_state and p->scx.dsq_list stay inside the host kernel sched_ext hot path; this is same-authority kernel memory corruption, not a VM, IOMMU, or guest-to-host escape.\nC:H - scx_move_local_task_to_local_dsq() and move_task_between_dsqs() unlink and re-link p->scx.dsq_list and RMW p->scx.flags (scx_resolve_local_dsq() may clear SCX_TASK_IMMED) while scx_dispatch_enqueue() still holds SCX_OPSS_DISPATCHING; a lost SCX_TASK_QUEUED bit or a second list_add of the live node corrupts kernel list state, a disclosure-capable memory-corruption primitive.\nI:H - The same unsynchronized DSQ unlink/insert and non-atomic p->scx.flags RMW, plus scx_dispatch_enqueue()'s later SCX_ENQ_CLEAR_OPSS store overwriting a new QUEUEING/QUEUED ops_state, can double-link a task or clobber scheduler ownership and yield kernel list corruption and control-flow corruption on the sched_ext path.\nA:H - Consuming or moving a task found on a non-local DSQ while scx_dispatch_enqueue() is still in ops.dequeue() with SCX_OPSS_DISPATCHING set hits WARN_ON_ONCE() in the enqueue/dispatch paths, can strand the task when CLEAR_OPSS overwrites QUEUED so later finish_dispatch() drops it, and can oops on a corrupted dsq_list, causing a kernel hang or panic."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/sched/ext/ext.c"], "versions": [{"version": "ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d", "lessThan": "cc2839946328c1618b3870d521b32bb9483d49d0", "status": "affected", "versionType": "git"}, {"version": "ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d", "lessThan": "2935062be77113c1c4565ca9d0c72180449aafee", "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/ext.c"], "versions": [{"version": "7.1", "status": "affected"}, {"version": "0", "lessThan": "7.1", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.14", "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": "7.1", "versionEndExcluding": "7.2.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/cc2839946328c1618b3870d521b32bb9483d49d0"}, {"url": "https://git.kernel.org/stable/c/2935062be77113c1c4565ca9d0c72180449aafee"}], "title": "sched_ext: Wait for SCX_OPSS_DISPATCHING before moving tasks off DSQs", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/sched/ext/ext.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "cc2839946328c1618b3870d521b32bb9483d49d0", "status": "affected", "version": "ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d", "versionType": "git"}, {"lessThan": "2935062be77113c1c4565ca9d0c72180449aafee", "status": "affected", "version": "ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/sched/ext/ext.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.1"}, {"lessThan": "7.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.14", "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\nsched_ext: Wait for SCX_OPSS_DISPATCHING before moving tasks off DSQs\n\nA task can be found on a non-local DSQ while the CPU which dispatched it\nis still running ops.dequeue() and hasn't cleared SCX_OPSS_DISPATCHING.\nThe DSQ consume and move paths don't wait for the dispatch to finish and\ncan operate on the task concurrently with the dispatcher.\n\nCall scx_wait_dispatching() in scx_move_local_task_to_local_dsq(),\nunlink_dsq_and_switch_rq_lock() and move_task_between_dsqs() before they\noperate on the task. In scx_move_local_task_to_local_dsq(), wait before\nscx_resolve_local_dsq() as it may update p->scx.flags."}], "id": "CVE-2026-99269", "lastModified": "2026-11-03T20:18:32.627", "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": "2026-11-03T12:17:34.117", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2935062be77113c1c4565ca9d0c72180449aafee"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cc2839946328c1618b3870d521b32bb9483d49d0"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: kernel: Denial of Service via race condition in sched_ext dispatch queues", "id": "2565743", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2565743"}, "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-366", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nsched_ext: Wait for SCX_OPSS_DISPATCHING before moving tasks off DSQs\nA task can be found on a non-local DSQ while the CPU which dispatched it\nis still running ops.dequeue() and hasn't cleared SCX_OPSS_DISPATCHING.\nThe DSQ consume and move paths don't wait for the dispatch to finish and\ncan operate on the task concurrently with the dispatcher.\nCall scx_wait_dispatching() in scx_move_local_task_to_local_dsq(),\nunlink_dsq_and_switch_rq_lock() and move_task_between_dsqs() before they\noperate on the task. In scx_move_local_task_to_local_dsq(), wait before\nscx_resolve_local_dsq() as it may update p->scx.flags.", "A flaw was found in the Linux kernel's sched_ext (extensible scheduler) subsystem. A race condition exists when moving tasks off dispatch queues because the consume and move paths do not wait for the dispatch operation to finish. A local user could exploit this timing issue to cause concurrent task operations, leading to kernel memory corruption and a Denial of Service (DoS) via a system crash."], "name": "CVE-2026-99269", "package_state": [{"cpe": "cpe:/a:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:rhel_els:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:rhel_els:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:rhel_els:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/a:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:5", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-10", "product_name": "Red Hat OpenShift Container Platform 5"}, {"cpe": "cpe:/a:redhat:openshift:5", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 5"}], "public_date": "2026-11-03T11:48:18Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-99269\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-99269\nhttps://git.kernel.org/stable/c/2935062be77113c1c4565ca9d0c72180449aafee\nhttps://git.kernel.org/stable/c/cc2839946328c1618b3870d521b32bb9483d49d0"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d,cc2839946328c1618b3870d521b32bb9483d49d0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d,2935062be77113c1c4565ca9d0c72180449aafee)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,7.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.14,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d,cc2839946328c1618b3870d521b32bb9483d49d0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d,2935062be77113c1c4565ca9d0c72180449aafee)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"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": "7.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,7.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.14,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-11-03T13:30:15.576057+00:00", "updated": "2026-11-05T16:45:06.278589+00:00", "vendors": ["linux", "linux$PRODUCT$linux", "linux$PRODUCT$linux_kernel"]}