VulnerabilityPublished 28 Oct 2026

CVE-2026-99104: Linux kernel · sched_ext: Fix the bypass dispatch claim for schedulers bypassed by an ancestor

Source GCVE Database

Authoritative record:CVE-2026-99104

Not known to be exploited : upgrade to f0f18075e45d47bef7ff2eb9512ee4f0c7e5f9c7 or 5bdeca322a6f8d10acaf67cccab1f69747ee7be3 when convenient.

Data as of 28 Oct 2026, 14:28 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Patch: Available – fixed in f0f18075e45d47bef7ff2eb9512ee4f0c7e5f9c7, 5bdeca322a6f8d10acaf67cccab1f69747ee7be3

Exploitation evidence

Disclosed: evidence found.
CVE published 28 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-73px-7g6q-p2m6

What to do

Upgrade Linux kernel to f0f18075e45d47bef7ff2eb9512ee4f0c7e5f9c7 or 5bdeca322a6f8d10acaf67cccab1f69747ee7be3.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ aa2a0a19686c90106ade6a7e848ffbb62d55d733, < f0f18075e45d47bef7ff2eb9512ee4f0c7e5f9c7	Fixed in f0f18075e45d47bef7ff2eb9512ee4f0c7e5f9c7
LinuxLinux	Affected ≥ aa2a0a19686c90106ade6a7e848ffbb62d55d733, < 5bdeca322a6f8d10acaf67cccab1f69747ee7be3	Fixed in 5bdeca322a6f8d10acaf67cccab1f69747ee7be3
LinuxLinux	Affected =7.1	Fixed in–

Description

A vulnerability in the Linux kernel scheduler subsystem (sched_ext) involves incorrect handling of bypass dispatch claims for schedulers bypassed by an ancestor. This flaw causes some descendant schedulers to either leak claims or fail to claim bypass dispatch properly, leading to potential task scheduling issues during power management suspend and resume cycles.

References

Community reviews

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