CVE-2025-68202 (GCVE-0-2025-68202)
Vulnerability from cvelistv5
Published
2025-12-16 13:48
Modified
2025-12-16 13:48
Severity ?
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); <Interrupt> lock(&rq->__lock); *** DEADLOCK *** stack backtrace: CPU: 0 UID: 0 PID: 27 Comm: irq_work/0 Call Trace: <TASK> dump_stack_lvl+0x8c/0xd0 dump_stack+0x14/0x20 print_usage_bug+0x42e/0x690 mark_lock.part.44+0x867/0xa70 ? __pfx_mark_lock.part.44+0x10/0x10 ? string_nocheck+0x19c/0x310 ? number+0x739/0x9f0 ? __pfx_string_nocheck+0x10/0x10 ? __pfx_check_pointer+0x10/0x10 ? kvm_sched_clock_read+0x15/0x30 ? sched_clock_noinstr+0xd/0x20 ? local_clock_noinstr+0x1c/0xe0 __lock_acquire+0xc4b/0x62b0 ? __pfx_format_decode+0x10/0x10 ? __pfx_string+0x10/0x10 ? __pfx___lock_acquire+0x10/0x10 ? __pfx_vsnprintf+0x10/0x10 lock_acquire+0x1e1/0x510 ? raw_spin_rq_lock_nested+0x2b/0x40 ? __pfx_lock_acquire+0x10/0x10 ? dump_line+0x12e/0x270 ? raw_spin_rq_lock_nested+0x20/0x40 _raw_spin_lock_nested+0x42/0x80 ? raw_spin_rq_lock_nested+0x2b/0x40 raw_spin_rq_lock_nested+0x2b/0x40 scx_dump_state+0x3b3/0x1270 ? finish_task_switch+0x27e/0x840 scx_ops_error_irq_workfn+0x67/0x80 irq_work_single+0x113/0x260 irq_work_run_list.part.3+0x44/0x70 run_irq_workd+0x6b/0x90 ? __pfx_run_irq_workd+0x10/0x10 smpboot_thread_fn+0x529/0x870 ? __pfx_smpboot_thread_fn+0x10/0x10 kthread+0x305/0x3f0 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x40/0x70 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30 </TASK> This commit therefore use rq_lock_irqsave/irqrestore() to replace rq_lock/unlock() in the scx_dump_state().
References
Impacted products
Vendor Product Version
Linux Linux Version: 07814a9439a3b03d79a1001614b5bc1cab69bcec
Version: 07814a9439a3b03d79a1001614b5bc1cab69bcec
Version: 07814a9439a3b03d79a1001614b5bc1cab69bcec
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/sched/ext.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "13d1c96d3a9f208bc1aa8642f6362dca25a157d2",
              "status": "affected",
              "version": "07814a9439a3b03d79a1001614b5bc1cab69bcec",
              "versionType": "git"
            },
            {
              "lessThan": "b6109750063d3b9aca1c57031213ac5485a06c54",
              "status": "affected",
              "version": "07814a9439a3b03d79a1001614b5bc1cab69bcec",
              "versionType": "git"
            },
            {
              "lessThan": "5f02151c411dda46efcc5dc57b0845efcdcfc26d",
              "status": "affected",
              "version": "07814a9439a3b03d79a1001614b5bc1cab69bcec",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/sched/ext.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.59",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.59",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.9",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Fix unsafe locking in the scx_dump_state()\n\nFor built with CONFIG_PREEMPT_RT=y kernels, the dump_lock will be converted\nsleepable spinlock and not disable-irq, so the following scenarios occur:\n\ninconsistent {IN-HARDIRQ-W} -\u003e {HARDIRQ-ON-W} usage.\nirq_work/0/27 [HC0[0]:SC0[0]:HE1:SE1] takes:\n(\u0026rq-\u003e__lock){?...}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x40\n{IN-HARDIRQ-W} state was registered at:\n   lock_acquire+0x1e1/0x510\n   _raw_spin_lock_nested+0x42/0x80\n   raw_spin_rq_lock_nested+0x2b/0x40\n   sched_tick+0xae/0x7b0\n   update_process_times+0x14c/0x1b0\n   tick_periodic+0x62/0x1f0\n   tick_handle_periodic+0x48/0xf0\n   timer_interrupt+0x55/0x80\n   __handle_irq_event_percpu+0x20a/0x5c0\n   handle_irq_event_percpu+0x18/0xc0\n   handle_irq_event+0xb5/0x150\n   handle_level_irq+0x220/0x460\n   __common_interrupt+0xa2/0x1e0\n   common_interrupt+0xb0/0xd0\n   asm_common_interrupt+0x2b/0x40\n   _raw_spin_unlock_irqrestore+0x45/0x80\n   __setup_irq+0xc34/0x1a30\n   request_threaded_irq+0x214/0x2f0\n   hpet_time_init+0x3e/0x60\n   x86_late_time_init+0x5b/0xb0\n   start_kernel+0x308/0x410\n   x86_64_start_reservations+0x1c/0x30\n   x86_64_start_kernel+0x96/0xa0\n   common_startup_64+0x13e/0x148\n\n other info that might help us debug this:\n Possible unsafe locking scenario:\n\n        CPU0\n        ----\n   lock(\u0026rq-\u003e__lock);\n   \u003cInterrupt\u003e\n     lock(\u0026rq-\u003e__lock);\n\n  *** DEADLOCK ***\n\n stack backtrace:\n CPU: 0 UID: 0 PID: 27 Comm: irq_work/0\n Call Trace:\n  \u003cTASK\u003e\n  dump_stack_lvl+0x8c/0xd0\n  dump_stack+0x14/0x20\n  print_usage_bug+0x42e/0x690\n  mark_lock.part.44+0x867/0xa70\n  ? __pfx_mark_lock.part.44+0x10/0x10\n  ? string_nocheck+0x19c/0x310\n  ? number+0x739/0x9f0\n  ? __pfx_string_nocheck+0x10/0x10\n  ? __pfx_check_pointer+0x10/0x10\n  ? kvm_sched_clock_read+0x15/0x30\n  ? sched_clock_noinstr+0xd/0x20\n  ? local_clock_noinstr+0x1c/0xe0\n  __lock_acquire+0xc4b/0x62b0\n  ? __pfx_format_decode+0x10/0x10\n  ? __pfx_string+0x10/0x10\n  ? __pfx___lock_acquire+0x10/0x10\n  ? __pfx_vsnprintf+0x10/0x10\n  lock_acquire+0x1e1/0x510\n  ? raw_spin_rq_lock_nested+0x2b/0x40\n  ? __pfx_lock_acquire+0x10/0x10\n  ? dump_line+0x12e/0x270\n  ? raw_spin_rq_lock_nested+0x20/0x40\n  _raw_spin_lock_nested+0x42/0x80\n  ? raw_spin_rq_lock_nested+0x2b/0x40\n  raw_spin_rq_lock_nested+0x2b/0x40\n  scx_dump_state+0x3b3/0x1270\n  ? finish_task_switch+0x27e/0x840\n  scx_ops_error_irq_workfn+0x67/0x80\n  irq_work_single+0x113/0x260\n  irq_work_run_list.part.3+0x44/0x70\n  run_irq_workd+0x6b/0x90\n  ? __pfx_run_irq_workd+0x10/0x10\n  smpboot_thread_fn+0x529/0x870\n  ? __pfx_smpboot_thread_fn+0x10/0x10\n  kthread+0x305/0x3f0\n  ? __pfx_kthread+0x10/0x10\n  ret_from_fork+0x40/0x70\n  ? __pfx_kthread+0x10/0x10\n  ret_from_fork_asm+0x1a/0x30\n  \u003c/TASK\u003e\n\nThis commit therefore use rq_lock_irqsave/irqrestore() to replace\nrq_lock/unlock() in the scx_dump_state()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-16T13:48:30.376Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/13d1c96d3a9f208bc1aa8642f6362dca25a157d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/b6109750063d3b9aca1c57031213ac5485a06c54"
        },
        {
          "url": "https://git.kernel.org/stable/c/5f02151c411dda46efcc5dc57b0845efcdcfc26d"
        }
      ],
      "title": "sched_ext: Fix unsafe locking in the scx_dump_state()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68202",
    "datePublished": "2025-12-16T13:48:30.376Z",
    "dateReserved": "2025-12-16T13:41:40.255Z",
    "dateUpdated": "2025-12-16T13:48:30.376Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68202\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-16T14:15:53.047\",\"lastModified\":\"2025-12-18T15:08:25.907\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsched_ext: Fix unsafe locking in the scx_dump_state()\\n\\nFor built with CONFIG_PREEMPT_RT=y kernels, the dump_lock will be converted\\nsleepable spinlock and not disable-irq, so the following scenarios occur:\\n\\ninconsistent {IN-HARDIRQ-W} -\u003e {HARDIRQ-ON-W} usage.\\nirq_work/0/27 [HC0[0]:SC0[0]:HE1:SE1] takes:\\n(\u0026rq-\u003e__lock){?...}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x40\\n{IN-HARDIRQ-W} state was registered at:\\n   lock_acquire+0x1e1/0x510\\n   _raw_spin_lock_nested+0x42/0x80\\n   raw_spin_rq_lock_nested+0x2b/0x40\\n   sched_tick+0xae/0x7b0\\n   update_process_times+0x14c/0x1b0\\n   tick_periodic+0x62/0x1f0\\n   tick_handle_periodic+0x48/0xf0\\n   timer_interrupt+0x55/0x80\\n   __handle_irq_event_percpu+0x20a/0x5c0\\n   handle_irq_event_percpu+0x18/0xc0\\n   handle_irq_event+0xb5/0x150\\n   handle_level_irq+0x220/0x460\\n   __common_interrupt+0xa2/0x1e0\\n   common_interrupt+0xb0/0xd0\\n   asm_common_interrupt+0x2b/0x40\\n   _raw_spin_unlock_irqrestore+0x45/0x80\\n   __setup_irq+0xc34/0x1a30\\n   request_threaded_irq+0x214/0x2f0\\n   hpet_time_init+0x3e/0x60\\n   x86_late_time_init+0x5b/0xb0\\n   start_kernel+0x308/0x410\\n   x86_64_start_reservations+0x1c/0x30\\n   x86_64_start_kernel+0x96/0xa0\\n   common_startup_64+0x13e/0x148\\n\\n other info that might help us debug this:\\n Possible unsafe locking scenario:\\n\\n        CPU0\\n        ----\\n   lock(\u0026rq-\u003e__lock);\\n   \u003cInterrupt\u003e\\n     lock(\u0026rq-\u003e__lock);\\n\\n  *** DEADLOCK ***\\n\\n stack backtrace:\\n CPU: 0 UID: 0 PID: 27 Comm: irq_work/0\\n Call Trace:\\n  \u003cTASK\u003e\\n  dump_stack_lvl+0x8c/0xd0\\n  dump_stack+0x14/0x20\\n  print_usage_bug+0x42e/0x690\\n  mark_lock.part.44+0x867/0xa70\\n  ? __pfx_mark_lock.part.44+0x10/0x10\\n  ? string_nocheck+0x19c/0x310\\n  ? number+0x739/0x9f0\\n  ? __pfx_string_nocheck+0x10/0x10\\n  ? __pfx_check_pointer+0x10/0x10\\n  ? kvm_sched_clock_read+0x15/0x30\\n  ? sched_clock_noinstr+0xd/0x20\\n  ? local_clock_noinstr+0x1c/0xe0\\n  __lock_acquire+0xc4b/0x62b0\\n  ? __pfx_format_decode+0x10/0x10\\n  ? __pfx_string+0x10/0x10\\n  ? __pfx___lock_acquire+0x10/0x10\\n  ? __pfx_vsnprintf+0x10/0x10\\n  lock_acquire+0x1e1/0x510\\n  ? raw_spin_rq_lock_nested+0x2b/0x40\\n  ? __pfx_lock_acquire+0x10/0x10\\n  ? dump_line+0x12e/0x270\\n  ? raw_spin_rq_lock_nested+0x20/0x40\\n  _raw_spin_lock_nested+0x42/0x80\\n  ? raw_spin_rq_lock_nested+0x2b/0x40\\n  raw_spin_rq_lock_nested+0x2b/0x40\\n  scx_dump_state+0x3b3/0x1270\\n  ? finish_task_switch+0x27e/0x840\\n  scx_ops_error_irq_workfn+0x67/0x80\\n  irq_work_single+0x113/0x260\\n  irq_work_run_list.part.3+0x44/0x70\\n  run_irq_workd+0x6b/0x90\\n  ? __pfx_run_irq_workd+0x10/0x10\\n  smpboot_thread_fn+0x529/0x870\\n  ? __pfx_smpboot_thread_fn+0x10/0x10\\n  kthread+0x305/0x3f0\\n  ? __pfx_kthread+0x10/0x10\\n  ret_from_fork+0x40/0x70\\n  ? __pfx_kthread+0x10/0x10\\n  ret_from_fork_asm+0x1a/0x30\\n  \u003c/TASK\u003e\\n\\nThis commit therefore use rq_lock_irqsave/irqrestore() to replace\\nrq_lock/unlock() in the scx_dump_state().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/13d1c96d3a9f208bc1aa8642f6362dca25a157d2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5f02151c411dda46efcc5dc57b0845efcdcfc26d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b6109750063d3b9aca1c57031213ac5485a06c54\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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