VulnerabilityPublished 18 Oct 2026

CVE-2026-98864: Linux kernel · sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing a task

Source GCVE Database

Authoritative record:CVE-2026-98864· Medium

Not known to be exploited : upgrade to 43457bf6550044c40bd6d3fcdf9ea66f5a55d139 or 7de9a6fb44eae4f05e68c805d58b9c618815adfa when convenient.

Data as of 26 Oct 2026, 12:55 UTC

Severity

Medium

Rated by Threat Radar · 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 43457bf6550044c40bd6d3fcdf9ea66f5a55d139, 7de9a6fb44eae4f05e68c805d58b9c618815adfa

Exploitation evidence

Disclosed: evidence found.
CVE published 18 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.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-fpjr-j5w9-j6gm

What to do

Upgrade Linux kernel to 43457bf6550044c40bd6d3fcdf9ea66f5a55d139 or 7de9a6fb44eae4f05e68c805d58b9c618815adfa.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d, < 43457bf6550044c40bd6d3fcdf9ea66f5a55d139	Fixed in 43457bf6550044c40bd6d3fcdf9ea66f5a55d139
LinuxLinux	Affected ≥ ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d, < 7de9a6fb44eae4f05e68c805d58b9c618815adfa	Fixed in 7de9a6fb44eae4f05e68c805d58b9c618815adfa
LinuxLinux	Affected =7.1	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to address this issue by modifying the scheduler extension to wait for the SCX_OPSS_DISPATCHING state to clear before reenqueueing tasks. Users should apply the official kernel updates containing this fix when available.

Description

A vulnerability in the Linux kernel's scheduler extension was resolved by ensuring that the system waits for the SCX_OPSS_DISPATCHING state to clear before reenqueueing a task. Previously, a task could be requeued prematurely, causing the dispatcher's final state update to overwrite the queued state and drop subsequent dispatches of that task.

References

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