# CVE-2026-98219: linux: In the Linux kernel, the following vulnerability has been resolved:  sched_ext: Close the pre-enable ops error claim...

CVE-2026-98219 is fixed in linux on 1 platform by DEBIAN-CVE-2026-98219 (version 7.2.8-1), released October 6, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-98219
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 6, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  sched_ext: Close the pre-enable ops error claim window  scx_alloc_and_add_sched() publishes ops->priv before scx_root_enable_workfn() switches the state to SCX_ENABLING. An error claimed via scx_bpf_error_bstr() from an associated BPF program in that window is consumed by scx_disable_workfn(), which takes the pre-enable shortcut in scx_root_disable(). The shortcut returns without any teardown and restores SCX_DISABLED with an unconditional scx_set_enable_state() xchg racing the enable workfn's own transition. The enable then completes with the claim consumed: the scheduler stays up but can never be disabled again, and bpf_scx_unreg() frees it while still in use, resulting in a use-after-free. Both WARN_ON_ONCE()s fire back to back:    WARNING: kernel/sched/ext/ext.c:7522 at   scx_root_enable_workfn+0xeec/0x1be0, CPU#3: scx_enable_help/276    WARNING: kernel/sched/ext/ext.c:6398 at scx_root_disable+0xb50/0xdb8,   CPU#0: sched_ext_helpe/664  scx_root_enable_workfn() switches to SCX_ENABLING before the scheduler allocation, so ops->priv is never visible while SCX_DISABLED. The allocation failure path restores SCX_DISABLED.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.2.8-1 | [DEBIAN-CVE-2026-98219](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98219.md) | Oct 6, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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