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 Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.12-libbpf-develUpgrade bpftool6.12-debuginfoUpgrade kernel6.12-headersUpgrade perf6.12Upgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel6.12Upgrade kernel6.12-modules-extraUpgrade kernel6.12-libbpf-debuginfoUpgrade kernel6.12-libbpfUpgrade kernel6.12-modules-extra-commonUpgrade python3-perf6.12Upgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel6.12-develUpgrade kernel6.12-tools-develUpgrade kernel6.12-debuginfoUpgrade kernel6.12-libbpf-staticUpgrade bpftool6.12Upgrade perf6.12-debuginfoUpgrade python3-perf6.12-debuginfoUpgrade kernel6.12-toolsUpgrade kernel6.12-tools-debuginfoUpgrade kernel-livepatch-6.12.46-66.121 | Sep 30, 2025 | Sep 11, 2025 |
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Oracle_linux | — | Upgrade kernel-uek | Nov 11, 2025 | Sep 11, 2025 |
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