VulnerabilityPublished 28 Oct 2026

CVE-2026-99105: Linux kernel · sched_ext: Fix stall when a task enqueued with SCX_ENQ_LAST lands back on its CPU's

Source GCVE Database

Authoritative record:CVE-2026-99105

Not known to be exploited · fixed in 396ba6f04da3fd1fb5a3d1c9535bef3f967f4e59 : update Linux kernel when convenient.

Data as of 28 Oct 2026, 14:15 UTC

Severity

Medium

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

Patch: Available – fixed in 396ba6f04da3fd1fb5a3d1c9535bef3f967f4e59, 8d891c218016b6145993e082e7f732cb69dd0e29, 7a9df76679633cf26e0fea882a684012c6ec245a

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-2gwr-rx6x-67fg

What to do

Upgrade Linux kernel to 396ba6f04da3fd1fb5a3d1c9535bef3f967f4e59, 8d891c218016b6145993e082e7f732cb69dd0e29 or 7a9df76679633cf26e0fea882a684012c6ec245a.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ f0e1a0643a59bf1f922fa209cec86a170b784f3f, < 396ba6f04da3fd1fb5a3d1c9535bef3f967f4e59	Fixed in 396ba6f04da3fd1fb5a3d1c9535bef3f967f4e59
LinuxLinux	Affected ≥ f0e1a0643a59bf1f922fa209cec86a170b784f3f, < 8d891c218016b6145993e082e7f732cb69dd0e29	Fixed in 8d891c218016b6145993e082e7f732cb69dd0e29
LinuxLinux	Affected ≥ f0e1a0643a59bf1f922fa209cec86a170b784f3f, < 7a9df76679633cf26e0fea882a684012c6ec245a	Fixed in 7a9df76679633cf26e0fea882a684012c6ec245a
LinuxLinux	Affected =6.12	Fixed in–

AI-suggested

A fix for this issue has been implemented in the Linux kernel. Users should apply the official kernel updates that include this patch to resolve the stall condition. No additional mitigation is required beyond applying the fix.

Description

A Linux kernel vulnerability (CVE-2026-99105) involves a stall condition when a task enqueued with SCX_ENQ_LAST returns to its CPU's local dequeue queue (DSQ). This issue causes the CPU to idle with the task queued until an unrelated wakeup or watchdog event occurs, potentially leading to long stalls during task exit, such as during mass cgroup teardown.

References

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