sched_ext: Replace SCX_RQ_BAL_KEEP with a dispatch verdict return

{
  "id": "54788af0c90c8caa6480eb71ad7f84ddbc3bfbf64e8321ae1f0ae70478303904",
  "url": "https://osv.dev/vulnerability/CVE-2026-89519",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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).",
    "evidence": "osv:CVE-2026-89519",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-89519",
      "aliases": [
        "CVE-2026-89519"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "4c95380701f58b8112f0b891de8d160e4199e19d"
                },
                {
                  "fixed": "6f1d3bfe54430f8d54e0530a27f2ecbf8466576e"
                },
                {
                  "fixed": "ffaab58d217581cb75353168f8812a16e10463fc"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89519.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89519.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.135168170Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/6f1d3bfe54430f8d54e0530a27f2ecbf8466576e",
        "https://git.kernel.org/stable/c/ffaab58d217581cb75353168f8812a16e10463fc",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89519.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89519",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89519.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89519",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 497241,
  "published_at": "2026-09-11T19:44:01.858+00:00"
}