FKIE_CVE-2026-68094

Vulnerability from fkie_nvd - Published: 2026-08-10 13:19 - Updated: 2026-08-17 05:18
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: sched_ext: Preserve rq tracking across local DSQ dispatch dispatch_to_local_dsq() can run from scx_bpf_dsq_move_to_local() while ops.dispatch() has recorded the current rq. Moving a task to a local DSQ may switch to the source or destination rq before synchronously invoking ops.dequeue() through the following path: SCX_CALL_OP(dispatch, rq) ops.dispatch() scx_bpf_dsq_move_to_local() scx_flush_dispatch_buf() finish_dispatch() dispatch_to_local_dsq() scx_dispatch_enqueue() local_dsq_post_enq() call_task_dequeue() SCX_CALL_OP_TASK(dequeue, locked_rq, ...) The nested callback saves the recorded rq and restores it on return. If the rq tracking does not follow the lock switch, update_locked_rq() can trigger the following lockdep assertion while restoring an rq which is no longer held: WARNING: kernel/sched/sched.h:1641 at call_task_dequeue+0x160/0x170 Call Trace: scx_dispatch_enqueue+0x2b0/0x460 dispatch_to_local_dsq+0x138/0x230 scx_flush_dispatch_buf+0x1af/0x220 scx_bpf_dsq_move_to_local___v2+0xe2/0x1c0 bpf__sched_ext_ops_dispatch+0x4b/0xa7 do_pick_task_scx+0x3b6/0x910 __pick_next_task+0x105/0x1f0 __schedule+0x3e7/0x1980 Introduce switch_rq_lock() to update the tracking state together with each rq lock handoff. Use it in dispatch_to_local_dsq(), move_remote_task_to_local_dsq() and the in-balance paths of scx_dsq_move(), ensuring that scx_locked_rq() consistently refers to the rq whose lock is actually held throughout the lock dance.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/18d62044cda7a2b40f59d910659c0b0d6accad37
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/97c09c9f5739b8757ee29dabb0af30069137e286
Impacted products
Vendor Product Version
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{
  "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": "97c09c9f5739b8757ee29dabb0af30069137e286",
              "status": "affected",
              "version": "7fb39e4eb4c3db52e4707a6a1cd45362f7e803f5",
              "versionType": "git"
            },
            {
              "lessThan": "18d62044cda7a2b40f59d910659c0b0d6accad37",
              "status": "affected",
              "version": "7fb39e4eb4c3db52e4707a6a1cd45362f7e803f5",
              "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": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "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: Preserve rq tracking across local DSQ dispatch\n\ndispatch_to_local_dsq() can run from scx_bpf_dsq_move_to_local() while\nops.dispatch() has recorded the current rq. Moving a task to a local DSQ\nmay switch to the source or destination rq before synchronously invoking\nops.dequeue() through the following path:\n\n  SCX_CALL_OP(dispatch, rq)\n    ops.dispatch()\n      scx_bpf_dsq_move_to_local()\n        scx_flush_dispatch_buf()\n          finish_dispatch()\n            dispatch_to_local_dsq()\n              scx_dispatch_enqueue()\n                local_dsq_post_enq()\n                  call_task_dequeue()\n                    SCX_CALL_OP_TASK(dequeue, locked_rq, ...)\n\nThe nested callback saves the recorded rq and restores it on return. If\nthe rq tracking does not follow the lock switch, update_locked_rq() can\ntrigger the following lockdep assertion while restoring an rq which is\nno longer held:\n\n  WARNING: kernel/sched/sched.h:1641 at call_task_dequeue+0x160/0x170\n  Call Trace:\n    scx_dispatch_enqueue+0x2b0/0x460\n    dispatch_to_local_dsq+0x138/0x230\n    scx_flush_dispatch_buf+0x1af/0x220\n    scx_bpf_dsq_move_to_local___v2+0xe2/0x1c0\n    bpf__sched_ext_ops_dispatch+0x4b/0xa7\n    do_pick_task_scx+0x3b6/0x910\n    __pick_next_task+0x105/0x1f0\n    __schedule+0x3e7/0x1980\n\nIntroduce switch_rq_lock() to update the tracking state together with\neach rq lock handoff. Use it in dispatch_to_local_dsq(),\nmove_remote_task_to_local_dsq() and the in-balance paths of\nscx_dsq_move(), ensuring that scx_locked_rq() consistently refers to the\nrq whose lock is actually held throughout the lock dance."
    }
  ],
  "id": "CVE-2026-68094",
  "lastModified": "2026-08-17T05:18:08.667",
  "metrics": {},
  "published": "2026-08-10T13:19:53.543",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/18d62044cda7a2b40f59d910659c0b0d6accad37"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/97c09c9f5739b8757ee29dabb0af30069137e286"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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