VulnerabilityPublished 18 Oct 2026

CVE-2026-98723: Linux kernel · nvmet: copy the hostid into the ctrl before creating PR pc_refs

Source GCVE Database

Authoritative record:CVE-2026-98723· Medium

Not known to be exploited · fixed in d3d6d7efdacc08616d23b3ac42272a494951dc0f : 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 d3d6d7efdacc08616d23b3ac42272a494951dc0f, 23194531595c5d1d4454e3a607b0c8fc0c4e8695, 5211fed41d7ec90e9ab7239dc4bffffe4d0b2b62

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-hpxm-6496-49xp

What to do

Upgrade Linux kernel to d3d6d7efdacc08616d23b3ac42272a494951dc0f, 23194531595c5d1d4454e3a607b0c8fc0c4e8695 or 5211fed41d7ec90e9ab7239dc4bffffe4d0b2b62.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 7b658153f1b8a79ed98980f2fef7b92a66aeb9cd, < d3d6d7efdacc08616d23b3ac42272a494951dc0f	Fixed in d3d6d7efdacc08616d23b3ac42272a494951dc0f
LinuxLinux	Affected ≥ 7b658153f1b8a79ed98980f2fef7b92a66aeb9cd, < 23194531595c5d1d4454e3a607b0c8fc0c4e8695	Fixed in 23194531595c5d1d4454e3a607b0c8fc0c4e8695
LinuxLinux	Affected ≥ 7b658153f1b8a79ed98980f2fef7b92a66aeb9cd, < 5211fed41d7ec90e9ab7239dc4bffffe4d0b2b62	Fixed in 5211fed41d7ec90e9ab7239dc4bffffe4d0b2b62
LinuxLinux	Affected =6.15	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel source code to copy the hostid earlier in the connection process, ensuring correct matching for Preempt and Abort operations. Users should update to a kernel version that includes this fix. Patch status is not explicitly stated in the provided data; therefore, check the official Linux kernel advisories or vendor patches for the exact fixed versions and remediation guidance.

Description

A vulnerability in the Linux kernel's nvmet subsystem was resolved involving improper copying of the hostid into the controller structure before creating persistent reservation (PR) pc_refs. This caused the hostid used for matching preempted registrants to be a nil UUID, preventing correct identification and handling of in-flight I/O during Preempt and Abort operations. As a result, Preempt and Abort silently degraded to plain Preempt, potentially leaving victim I/O unhandled during reconnects. The fix involves copying the hostid earlier in the connection process before the controller is published and before the snapshot for reservations is taken.

Impact

The vulnerability causes the Preempt and Abort mechanism in the nvmet subsystem to fail to properly abort victim in-flight I/O during reconnects when persistent reservations are enabled. This silent degradation means that the preempting host believes the abort succeeded while the victim's I/O continues, potentially leading to inconsistent I/O states or data integrity issues in environments relying on these reservation features.

References

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