fkie_cve-2025-39780
Vulnerability from fkie_nvd
Published
2025-09-11 17:15
Modified
2025-09-15 15:22
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 |
|---|
{
"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."
}
],
"id": "CVE-2025-39780",
"lastModified": "2025-09-15T15:22:38.297",
"metrics": {},
"published": "2025-09-11T17:15:43.900",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"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"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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