CVE-2025-39780sched/ext: Fix invalid task state transitions on class switch
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Aug 5, 2026
- First seen by InfoSec Signals
- Oct 19, 2026
Affected products
Linux Linux linux:linux (from the name) | from a8532fac7b5d27b8d62008a89593dccb6f9786ef before 786f6314604b34c3e7de5f733f4e08e35c448a50; from a8532fac7b5d27b8d62008a89593dccb6f9786ef before 6a32cbe95029ebe21cc08349fd7ef2a3d32d2043; from a8532fac7b5d27b8d62008a89593dccb6f9786ef before ddf7233fcab6c247379d0928d46cc316ee122229 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.12 before 6.12.44; from 6.13 before 6.16.4; 6.17; 6.17 | NVD |
References
- https://git.kernel.org/stable/c/786f6314604b34c3e7de5f733f4e08e35c448a50patch
- https://git.kernel.org/stable/c/6a32cbe95029ebe21cc08349fd7ef2a3d32d2043patch
- https://git.kernel.org/stable/c/ddf7233fcab6c247379d0928d46cc316ee122229patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.