VulnerabilityPublished 18 Oct 2026

CVE-2026-98542: Linux kernel · cgroup/cpuset: Return PERR_NOCPUS in remote_partition_enable() on subpartitions_cpus

Source GCVE Database

Authoritative record:CVE-2026-98542· Medium

Not known to be exploited · fixed in 0751ab665cb3dcdac224b002565f2e28461740d5 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 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 0751ab665cb3dcdac224b002565f2e28461740d5, 241e67b60308cdce25bba66616a109759edd1d40, 31c88350b7dd1522792f726f79607f31bb55c50f

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-37q5-j4w5-c38r

What to do

Upgrade Linux kernel to 0751ab665cb3dcdac224b002565f2e28461740d5, 241e67b60308cdce25bba66616a109759edd1d40 or 31c88350b7dd1522792f726f79607f31bb55c50f.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 86888c7bd117c29eab169c37e5f6bbbf583da983, < 0751ab665cb3dcdac224b002565f2e28461740d5	Fixed in 0751ab665cb3dcdac224b002565f2e28461740d5
LinuxLinux	Affected ≥ 86888c7bd117c29eab169c37e5f6bbbf583da983, < 241e67b60308cdce25bba66616a109759edd1d40	Fixed in 241e67b60308cdce25bba66616a109759edd1d40
LinuxLinux	Affected ≥ 86888c7bd117c29eab169c37e5f6bbbf583da983, < 31c88350b7dd1522792f726f79607f31bb55c50f	Fixed in 31c88350b7dd1522792f726f79607f31bb55c50f
LinuxLinux	Affected =6.16	Fixed in–

AI-suggested

A fix has been implemented that returns an error (PERR_NOCPUS) when CPU conflicts occur in remote_partition_enable(), preventing overlapping exclusive CPU assignments. Users should update to the Linux kernel version that includes this fix (post Linux 7.3.0-rc3). No additional mitigation steps are indicated.

Description

A vulnerability in the Linux kernel's cgroup cpuset subsystem allowed remote_partition_enable() to enable remote partitions on CPUs already claimed exclusively by ancestor local partitions, causing conflicting CPU assignments. This was due to a change that replaced an error check with a warning, allowing the conflict to proceed. The issue was fixed by restoring an error return when such conflicts occur, preventing overlapping exclusive CPU claims.

References

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