CVE-2025-39780 (GCVE-0-2025-39780)
Vulnerability from cvelistv5
Published
2025-09-11 16:56
Modified
2025-09-29 05:59
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: sched/ext: Fix invalid task state transitions on class switch When enabling a sched_ext scheduler, we may trigger invalid task state transitions, resulting in warnings like the following (which can be easily reproduced by running the hotplug selftest in a loop): sched_ext: Invalid task state transition 0 -> 3 for fish[770] WARNING: CPU: 18 PID: 787 at kernel/sched/ext.c:3862 scx_set_task_state+0x7c/0xc0 ... RIP: 0010:scx_set_task_state+0x7c/0xc0 ... Call Trace: <TASK> scx_enable_task+0x11f/0x2e0 switching_to_scx+0x24/0x110 scx_enable.isra.0+0xd14/0x13d0 bpf_struct_ops_link_create+0x136/0x1a0 __sys_bpf+0x1edd/0x2c30 __x64_sys_bpf+0x21/0x30 do_syscall_64+0xbb/0x370 entry_SYSCALL_64_after_hwframe+0x77/0x7f This happens because we skip initialization for tasks that are already dead (with their usage counter set to zero), but we don't exclude them during the scheduling class transition phase. Fix this by also skipping dead tasks during class swiching, preventing invalid task state transitions.
References
Impacted products
Vendor Product Version
Linux Linux Version: a8532fac7b5d27b8d62008a89593dccb6f9786ef
Version: a8532fac7b5d27b8d62008a89593dccb6f9786ef
Version: a8532fac7b5d27b8d62008a89593dccb6f9786ef
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/sched/ext.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "6.12"
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              "version": "0",
              "versionType": "semver"
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              "versionType": "original_commit_for_fix"
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/ext: Fix invalid task state transitions on class switch\n\nWhen enabling a sched_ext scheduler, we may trigger invalid task state\ntransitions, resulting in warnings like the following (which can be\neasily reproduced by running the hotplug selftest in a loop):\n\n sched_ext: Invalid task state transition 0 -\u003e 3 for fish[770]\n WARNING: CPU: 18 PID: 787 at kernel/sched/ext.c:3862 scx_set_task_state+0x7c/0xc0\n ...\n RIP: 0010:scx_set_task_state+0x7c/0xc0\n ...\n Call Trace:\n  \u003cTASK\u003e\n  scx_enable_task+0x11f/0x2e0\n  switching_to_scx+0x24/0x110\n  scx_enable.isra.0+0xd14/0x13d0\n  bpf_struct_ops_link_create+0x136/0x1a0\n  __sys_bpf+0x1edd/0x2c30\n  __x64_sys_bpf+0x21/0x30\n  do_syscall_64+0xbb/0x370\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nThis happens because we skip initialization for tasks that are already\ndead (with their usage counter set to zero), but we don\u0027t exclude them\nduring the scheduling class transition phase.\n\nFix this by also skipping dead tasks during class swiching, preventing\ninvalid task state transitions."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T05:59:15.616Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/786f6314604b34c3e7de5f733f4e08e35c448a50"
        },
        {
          "url": "https://git.kernel.org/stable/c/6a32cbe95029ebe21cc08349fd7ef2a3d32d2043"
        },
        {
          "url": "https://git.kernel.org/stable/c/ddf7233fcab6c247379d0928d46cc316ee122229"
        }
      ],
      "title": "sched/ext: Fix invalid task state transitions on class switch",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39780",
    "datePublished": "2025-09-11T16:56:31.142Z",
    "dateReserved": "2025-04-16T07:20:57.130Z",
    "dateUpdated": "2025-09-29T05:59:15.616Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39780\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-11T17:15:43.900\",\"lastModified\":\"2025-09-15T15:22:38.297\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsched/ext: Fix invalid task state transitions on class switch\\n\\nWhen enabling a sched_ext scheduler, we may trigger invalid task state\\ntransitions, resulting in warnings like the following (which can be\\neasily reproduced by running the hotplug selftest in a loop):\\n\\n sched_ext: Invalid task state transition 0 -\u003e 3 for fish[770]\\n WARNING: CPU: 18 PID: 787 at kernel/sched/ext.c:3862 scx_set_task_state+0x7c/0xc0\\n ...\\n RIP: 0010:scx_set_task_state+0x7c/0xc0\\n ...\\n Call Trace:\\n  \u003cTASK\u003e\\n  scx_enable_task+0x11f/0x2e0\\n  switching_to_scx+0x24/0x110\\n  scx_enable.isra.0+0xd14/0x13d0\\n  bpf_struct_ops_link_create+0x136/0x1a0\\n  __sys_bpf+0x1edd/0x2c30\\n  __x64_sys_bpf+0x21/0x30\\n  do_syscall_64+0xbb/0x370\\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\\n\\nThis happens because we skip initialization for tasks that are already\\ndead (with their usage counter set to zero), but we don\u0027t exclude them\\nduring the scheduling class transition phase.\\n\\nFix this by also skipping dead tasks during class swiching, preventing\\ninvalid task state transitions.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6a32cbe95029ebe21cc08349fd7ef2a3d32d2043\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/786f6314604b34c3e7de5f733f4e08e35c448a50\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ddf7233fcab6c247379d0928d46cc316ee122229\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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