VulnerabilityPublished 18 Oct 2026

CVE-2026-98463: Linux kernel · sched_ext: Derive SCX_RQ_IN_WAKEUP from the core enqueue flags

Source GCVE Database

Authoritative record:CVE-2026-98463· Medium

Not known to be exploited · fixed in df5cdc2c832ca4e8a6d774596b9005558761a403 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in df5cdc2c832ca4e8a6d774596b9005558761a403, 6c401ae426e20e53a3398a8e79afd0964c0f5110, 6.20 +2

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-7f2q-69qm-pp4c

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=6.18.19 <6.18.55 >=6.19.9 <6.20	Fixed in df5cdc2c832ca4e8a6d774596b9005558761a403 6c401ae426e20e53a3398a8e79afd0964c0f5110 6.20 6.18.55 3fdf2ceb31e8aff77451e468bc8409e10587916a
LinuxLinux	Affected =7.0	Fixed in–

AI-suggested

A fix for this vulnerability has been implemented in the Linux kernel. Users should apply the official kernel update that includes this patch. Since this is a kernel-level issue, running updated kernel versions with the fix is the recommended mitigation.

Description

A vulnerability in the Linux kernel scheduler's extended scheduling code (sched_ext) has been resolved. The issue involves incorrect handling of the SCX_RQ_IN_WAKEUP flag derived from enqueue flags, leading to deferred actions not being scheduled properly. This can cause an immediate (IMMED) task insert to remain pending behind the running task, potentially resulting in a use-after-free scenario when the scheduler is disabled and the deferred actions reference freed per-CPU memory. The fix ensures that only the core enqueue flags' wakeup bit triggers the task_woken_scx() call, preventing the stale flag condition.

References

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