sched_ext: Fix unsafe locking in the scx_dump_state()

{
  "id": "895ff47cfc6abddb39070be83bb5e25ed086d48b0abdc3ea97e19b02ff1ee158",
  "url": "https://osv.dev/vulnerability/CVE-2025-68202",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "sched_ext: Fix unsafe locking in the scx_dump_state()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: sched_ext: Fix unsafe locking in the scx_dump_state() For built with CONFIG_PREEMPT_RT=y kernels, the dump_lock will be converted sleepable spinlock and not disable-irq, so the following scenarios occur: inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage. irq_work/0/27 [HC0[0]:SC0[0]:HE1:SE1] takes: (&rq->__lock){?...}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x40 {IN-HARDIRQ-W} state was registered at: lock_acquire+0x1e1/0x510 _raw_spin_lock_nested+0x42/0x80 raw_spin_rq_lock_nested+0x2b/0x40 sched_tick+0xae/0x7b0 update_process_times+0x14c/0x1b0 tick_periodic+0x62/0x1f0 tick_handle_periodic+0x48/0xf0 timer_interrupt+0x55/0x80 __handle_irq_event_percpu+0x20a/0x5c0 handle_irq_event_percpu+0x18/0xc0 handle_irq_event+0xb5/0x150 handle_level_irq+0x220/0x460 __common_interrupt+0xa2/0x1e0 common_interrupt+0xb0/0xd0 asm_common_interrupt+0x2b/0x40 _raw_spin_unlock_irqrestore+0x45/0x80 __setup_irq+0xc34/0x1a30 request_threaded_irq+0x214/0x2f0 hpet_time_init+0x3e/0x60 x86_late_time_init+0x5b/0xb0 start_kernel+0x308/0x410 x86_64_start_reservations+0x1c/0x30 x86_64_start_kernel+0x96/0xa0 common_startup_64+0x13e/0x148 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&rq->__lock); lock(&rq->__lock); *** DEADLOCK *** stack backtrace: CPU: 0 UID: 0 PID: 27 Comm: irq_work/0 Call Trace: dump_stack_lvl+0x8c/0xd0 dump_stack+0x14/0x20 print_usage_bug+0x42e/0x690 mark_lock.part.44+0x867/0x",
    "evidence": "osv:CVE-2025-68202",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.59",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.17.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-68202",
      "aliases": [
        "CVE-2025-68202"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "07814a9439a3b03d79a1001614b5bc1cab69bcec"
                },
                {
                  "fixed": "13d1c96d3a9f208bc1aa8642f6362dca25a157d2"
                },
                {
                  "fixed": "b6109750063d3b9aca1c57031213ac5485a06c54"
                },
                {
                  "fixed": "5f02151c411dda46efcc5dc57b0845efcdcfc26d"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-68202.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.12.0"
                },
                {
                  "fixed": "6.12.59"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.17.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-68202.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:40.539853629Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/13d1c96d3a9f208bc1aa8642f6362dca25a157d2",
        "https://git.kernel.org/stable/c/5f02151c411dda46efcc5dc57b0845efcdcfc26d",
        "https://git.kernel.org/stable/c/b6109750063d3b9aca1c57031213ac5485a06c54",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68202.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-68202",
        "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/2025/68xxx/CVE-2025-68202.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-68202",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 507837,
  "published_at": "2025-12-16T13:48:30.376+00:00"
}