CVE-2026-89518

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89518", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.718Z", "datePublished": "2026-09-11T19:44:01.222Z", "dateUpdated": "2026-10-19T08:48:09.565Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:48:09.565Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Fix this_rq() assumptions in dispatch kfuncs\n\nUnder core scheduling, dispatch runs from within the core-wide pick and can\ntarget a sibling rq, so ops.dispatch() may execute on a CPU different from\nthe dispatched rq's. Several kfunc paths assumed the two always coincide:\n\n- scx_dsq_move() decided whether an rq lock is held by testing this_rq()'s\n rq flags and lock-danced accordingly. A dispatch for a sibling took the\n unlocked-context branch and acquired the source rq lock on top of the\n already held dispatched rq lock which could deadlock.\n\n- scx_bpf_sub_dispatch() dispatched this_rq() with its stashed\n sub_dispatch_prev, which is NULL when dispatching for a sibling.\n\n- finish_dispatch(), scx_bpf_dsq_reenq() and scx_bpf_dsq_nr_queued()\n resolved SCX_DSQ_LOCAL to this CPU's local DSQ rather than the dispatched\n rq's. The latter two are callable from other rq-locked operations too,\n where SCX_DSQ_LOCAL now likewise resolves to the op's rq. This changes\n behavior also without core scheduling, e.g. for ops.enqueue() running a\n remote wakeup on the waking CPU, and is intended: which CPU happens to\n execute an operation is incidental, the op's rq is what it is operating\n on, and the resolution now matches the insert side where SCX_DSQ_LOCAL\n dispatches land on the task's rq.\n\nUse the rq tracked by scx_locked_rq(), which is set to the dispatched rq\naround ops invocations and NULL in unlocked contexts."}], "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": "4c95380701f58b8112f0b891de8d160e4199e19d", "lessThan": "6d1890d3c6137ab523799765ae2de62cc05f116d", "status": "affected", "versionType": "git"}, {"version": "4c95380701f58b8112f0b891de8d160e4199e19d", "lessThan": "3dd52416e44a70bc993adb96d2e0d71b9ea21359", "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": "6.19", "status": "affected"}, {"version": "0", "lessThan": "6.19", "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": "6.19", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/6d1890d3c6137ab523799765ae2de62cc05f116d"}, {"url": "https://git.kernel.org/stable/c/3dd52416e44a70bc993adb96d2e0d71b9ea21359"}], "title": "sched_ext: Fix this_rq() assumptions in dispatch kfuncs", "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": "6d1890d3c6137ab523799765ae2de62cc05f116d", "status": "affected", "version": "4c95380701f58b8112f0b891de8d160e4199e19d", "versionType": "git"}, {"lessThan": "3dd52416e44a70bc993adb96d2e0d71b9ea21359", "status": "affected", "version": "4c95380701f58b8112f0b891de8d160e4199e19d", "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": "6.19"}, {"lessThan": "6.19", "status": "unaffected", "version": "0", "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\nsched_ext: Fix this_rq() assumptions in dispatch kfuncs\n\nUnder core scheduling, dispatch runs from within the core-wide pick and can\ntarget a sibling rq, so ops.dispatch() may execute on a CPU different from\nthe dispatched rq's. Several kfunc paths assumed the two always coincide:\n\n- scx_dsq_move() decided whether an rq lock is held by testing this_rq()'s\n rq flags and lock-danced accordingly. A dispatch for a sibling took the\n unlocked-context branch and acquired the source rq lock on top of the\n already held dispatched rq lock which could deadlock.\n\n- scx_bpf_sub_dispatch() dispatched this_rq() with its stashed\n sub_dispatch_prev, which is NULL when dispatching for a sibling.\n\n- finish_dispatch(), scx_bpf_dsq_reenq() and scx_bpf_dsq_nr_queued()\n resolved SCX_DSQ_LOCAL to this CPU's local DSQ rather than the dispatched\n rq's. The latter two are callable from other rq-locked operations too,\n where SCX_DSQ_LOCAL now likewise resolves to the op's rq. This changes\n behavior also without core scheduling, e.g. for ops.enqueue() running a\n remote wakeup on the waking CPU, and is intended: which CPU happens to\n execute an operation is incidental, the op's rq is what it is operating\n on, and the resolution now matches the insert side where SCX_DSQ_LOCAL\n dispatches land on the task's rq.\n\nUse the rq tracked by scx_locked_rq(), which is set to the dispatched rq\naround ops invocations and NULL in unlocked contexts."}], "id": "CVE-2026-89518", "lastModified": "2026-10-19T09:17:46.240", "metrics": {}, "published": "2026-09-11T20:19:34.417", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3dd52416e44a70bc993adb96d2e0d71b9ea21359"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6d1890d3c6137ab523799765ae2de62cc05f116d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux Kernel: `sched_ext` deadlock due to incorrect `this_rq()` assumptions", "id": "2532018", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532018"}, "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-833", "details": ["A flaw was found in the Linux kernel's `sched_ext` component. Under core scheduling, incorrect assumptions in dispatch kfuncs regarding `this_rq()` can lead to a deadlock. This occurs when an `rq` lock is acquired on a CPU different from the dispatched `rq`'s, potentially causing the system to become unresponsive. This vulnerability could result in a Denial of Service (DoS)."], "name": "CVE-2026-89518", "package_state": [{"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-11T19:44:01Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89518\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89518\nhttps://git.kernel.org/stable/c/3dd52416e44a70bc993adb96d2e0d71b9ea21359\nhttps://git.kernel.org/stable/c/6d1890d3c6137ab523799765ae2de62cc05f116d"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4c95380701f58b8112f0b891de8d160e4199e19d,6d1890d3c6137ab523799765ae2de62cc05f116d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4c95380701f58b8112f0b891de8d160e4199e19d,3dd52416e44a70bc993adb96d2e0d71b9ea21359)"}}], "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": "6.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.19)"}}, {"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": "2026-09-12T07:15:10.615632+00:00", "updated": "2026-09-15T22:30:15.258524+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}