CVE-2026-98219: Linux kernel · sched_ext: Close the pre-enable ops error claim window
Affects Linux kernelSource CVE Database V5
Not known to be exploited : upgrade to c7a1c6e8004ab12a9c9bfdcb603f60f9bf4a3cee or 959c66dc4a915be306c35691095c787c61dc7df9 soon.
Data as of 26 Oct 2026, 12:30 UTC
Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in c7a1c6e8004ab12a9c9bfdcb603f60f9bf4a3cee, 959c66dc4a915be306c35691095c787c61dc7df9
Exploitation evidence
Disclosed: evidence found.
CVE published 6 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade Linux kernel to c7a1c6e8004ab12a9c9bfdcb603f60f9bf4a3cee or 959c66dc4a915be306c35691095c787c61dc7df9.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
This vulnerability has been fixed in the Linux kernel versions identified by commits c7a1c6e8004ab12a9c9bfdcb603f60f9bf4a3cee and 959c66dc4a915be306c35691095c787c61dc7df9. Users should update to these fixed versions or later to remediate the issue.
Description
A use-after-free vulnerability in the Linux kernel's sched_ext subsystem was fixed. The issue arises due to a race condition during scheduler enable/disable operations involving BPF program error claims, which can lead to the scheduler remaining enabled but unable to be disabled and subsequent freeing of resources still in use.