{"id":"CVE-2026-89516","title":"sched_ext: Don't BUG_ON a destroyed DSQ in process_deferred_reenq_users","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Don't BUG_ON a destroyed DSQ in process_deferred_reenq_users\n\nscx_bpf_dsq_reenq() queues a deferred reenq (dru) that runs from\nrun_deferred(), not ops.dispat…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-825"],"vendor":"Linux","product":"Linux","affected":["Linux >= 84b1a0ea0b7c23dec240783a592e480780efe459 < c480961a1e790b46ffd8c20c4b6754d65ec6572d","Linux >= 84b1a0ea0b7c23dec240783a592e480780efe459 < 8d8dd8ae89eaa78b37fc85528e926029f5facbdf","Linux 7.1"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:48:07.582Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89516","references":[{"url":"https://git.kernel.org/stable/c/c480961a1e790b46ffd8c20c4b6754d65ec6572d"},{"url":"https://git.kernel.org/stable/c/8d8dd8ae89eaa78b37fc85528e926029f5facbdf"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89516.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89516"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532093"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89516"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89516"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89516.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00198,"epssPercentile":0.09454,"ingestedAt":"2026-09-14T11:11:19.887Z","slug":"CVE-2026-89516","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Don't BUG_ON a destroyed DSQ in process_deferred_reenq_users\n\nscx_bpf_dsq_reenq() queues a deferred reenq (dru) that runs from\nrun_deferred(), not ops.dispatch(). If the DSQ is destroyed before the dru\nruns, process_deferred_reenq_users() sees dsq->id == SCX_DSQ_INVALID and\nhits the BUG_ON. destroy_dsq() doesn't flush pending drus, so just skip.\n\ntj: Read dsq->id once with READ_ONCE(). Reading it separately in the INVALID\n    check and the BUG_ON would leave a window where destroy_dsq() can\n    invalidate the id between the two reads and still trigger the BUG_ON.\n\n## Affected\n\n- `Linux >= 84b1a0ea0b7c23dec240783a592e480780efe459 < c480961a1e790b46ffd8c20c4b6754d65ec6572d`\n- `Linux >= 84b1a0ea0b7c23dec240783a592e480780efe459 < 8d8dd8ae89eaa78b37fc85528e926029f5facbdf`\n- `Linux 7.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89516.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":206936,"id":"CVE-2026-89516","ts":1789749708336,"field":"cvss","old":null,"new":"5.5"},{"seq":206935,"id":"CVE-2026-89516","ts":1789749708336,"field":"severity","old":"none","new":"medium"},{"seq":147716,"id":"CVE-2026-89516","ts":1789270211997,"field":"cvss","old":null,"new":"4.1"},{"seq":147715,"id":"CVE-2026-89516","ts":1789270211997,"field":"severity","old":"none","new":"medium"},{"seq":109472,"id":"CVE-2026-89516","ts":1789183732047,"field":"cvss","old":null,"new":"4.1"},{"seq":109471,"id":"CVE-2026-89516","ts":1789183732047,"field":"severity","old":"none","new":"medium"}]}