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CVE-2026-89519 (GCVE-0-2026-89519)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:44 – Updated: 2026-09-11 19:44
VLAI
Title
sched_ext: Replace SCX_RQ_BAL_KEEP with a dispatch verdict return
Summary
In the Linux kernel, the following vulnerability has been resolved: sched_ext: Replace SCX_RQ_BAL_KEEP with a dispatch verdict return SCX_RQ_BAL_KEEP tells the pick to keep running the previous task, a leftover from when balancing and picking were separate operations. An rq-level flag only works while dispatches and picks pair up one to one, which core scheduling breaks: selections interleave through dispatch's lock drops and a pick can consume a stale flag, keeping a task that has since been dequeued. Fixing core scheduling support requires the decision to travel with the dispatch that made it. Make scx_dispatch_sched() and balance_one() return an explicit verdict instead and drop the flag's plumbing from the tools autogen enum headers. Also factor the pick-side invocation, its follow-up queueing and the post-dispatch checks out of do_pick_task_scx() into dispatch_pick(). No functional changes intended. v2: Drop the SCX_RQ_BAL_KEEP plumbing from the tools autogen enum headers as well (Andrea).
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4c95380701f58b8112f0b891de8d160e4199e19d , < 6f1d3bfe54430f8d54e0530a27f2ecbf8466576e (git)
Affected: 4c95380701f58b8112f0b891de8d160e4199e19d , < ffaab58d217581cb75353168f8812a16e10463fc (git)
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Linux Linux Affected: 6.19
Unaffected: 0 , < 6.19 (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "kernel/sched/ext/ext.c",
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            "tools/sched_ext/include/scx/enums.autogen.bpf.h",
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    "datePublished": "2026-09-11T19:44:01.858Z",
    "dateReserved": "2026-09-11T19:38:34.718Z",
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      "cve": "CVE-2026-89519",
      "id": "CVE-2026-89519",
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      "title": "kernel: sched_ext: Replace SCX_RQ_BAL_KEEP with a dispatch verdict return",
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      "cve": "CVE-2026-89519",
      "id": "CVE-2026-89519",
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      "product_status:known_not_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89519",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89519.json",
      "version": "3"
    }
  }
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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