VulnerabilityPublished 18 Oct 2026

CVE-2026-98820: Linux kernel · blk-mq: set RQF_USE_SCHED when the operation is known

Source GCVE Database

Authoritative record:CVE-2026-98820· Medium

Not known to be exploited · fixed in ab6c756f28c741d704a7c3e04814bfc3adf6f818 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in ab6c756f28c741d704a7c3e04814bfc3adf6f818, 790730e4d95de8356a573d4b4864486bba731863, 2c47ebc27fa72078e26177cd458cdaf3006a9685

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-95f6-3pp2-9382

What to do

Upgrade Linux kernel to ab6c756f28c741d704a7c3e04814bfc3adf6f818, 790730e4d95de8356a573d4b4864486bba731863 or 2c47ebc27fa72078e26177cd458cdaf3006a9685.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 4b6a5d9cea911424e84107df8c4eb8317938d2cd, < ab6c756f28c741d704a7c3e04814bfc3adf6f818	Fixed in ab6c756f28c741d704a7c3e04814bfc3adf6f818
LinuxLinux	Affected ≥ 4b6a5d9cea911424e84107df8c4eb8317938d2cd, < 790730e4d95de8356a573d4b4864486bba731863	Fixed in 790730e4d95de8356a573d4b4864486bba731863
LinuxLinux	Affected ≥ 4b6a5d9cea911424e84107df8c4eb8317938d2cd, < 2c47ebc27fa72078e26177cd458cdaf3006a9685	Fixed in 2c47ebc27fa72078e26177cd458cdaf3006a9685
LinuxLinux	Affected =6.1	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to address this issue by properly setting the RQF_USE_SCHED flag after the request is claimed by an operation. Users should update to the fixed kernel versions once available. Since this is a kernel-level fix, applying the official kernel update is the recommended remediation.

Description

A vulnerability in the Linux kernel's blk-mq subsystem was resolved involving incorrect handling of the RQF_USE_SCHED flag on cached requests. The flaw caused requests allocated for one operation to be reused for another without properly setting scheduling flags, leading to resource leaks and queue stalls in the kyber scheduler. The fix involves setting RQF_USE_SCHED only after the request is claimed by an operation and introducing a helper function to properly initialize requests.

References

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