VulnerabilityPublished 18 Oct 2026

CVE-2026-98727: Linux kernel · nvme-multipath: set BLK_FEAT_ZONED only after the zone info is known

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in 44dc998c38fb5e153c3ed5665f1112661841c3f5 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Medium

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

EPSS: 0.2% 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 44dc998c38fb5e153c3ed5665f1112661841c3f5, 8b85838c1fdba5ba90152693ca158aa9660c628f, 4a5e49ba0abb8b4328d6318c9aef0c0121f95507 +1

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.

What to do

Upgrade Linux kernel to 44dc998c38fb5e153c3ed5665f1112661841c3f5, 8b85838c1fdba5ba90152693ca158aa9660c628f, 4a5e49ba0abb8b4328d6318c9aef0c0121f95507 or 2d86abd28071481a1abd87204a47325975dc821c.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 28982ad73d6a9605708631dc49a0c763cc398aa2, < 44dc998c38fb5e153c3ed5665f1112661841c3f5	Fixed in 44dc998c38fb5e153c3ed5665f1112661841c3f5
LinuxLinux	Affected ≥ 28982ad73d6a9605708631dc49a0c763cc398aa2, < 8b85838c1fdba5ba90152693ca158aa9660c628f	Fixed in 8b85838c1fdba5ba90152693ca158aa9660c628f
LinuxLinux	Affected ≥ 28982ad73d6a9605708631dc49a0c763cc398aa2, < 4a5e49ba0abb8b4328d6318c9aef0c0121f95507	Fixed in 4a5e49ba0abb8b4328d6318c9aef0c0121f95507
LinuxLinux	Affected ≥ 28982ad73d6a9605708631dc49a0c763cc398aa2, < 2d86abd28071481a1abd87204a47325975dc821c	Fixed in 2d86abd28071481a1abd87204a47325975dc821c
LinuxLinux	Affected =6.11	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel source code, as indicated by the listed fixed commit versions. Users should update to a kernel version that includes these fixes to resolve the issue. No additional mitigation steps are specified or required beyond applying the official fix.

Description

A vulnerability in the Linux kernel's nvme-multipath subsystem was addressed by changing when the BLK_FEAT_ZONED feature flag is set. Previously, the namespace head was marked as zoned at allocation based solely on the command set identifier, which could lead to incorrect zoned capability reporting and a zero zone size causing invalid shifts. The fix delays setting the zoned feature until the zone information is confirmed, preventing erroneous behavior.

Impact

This flaw could cause incorrect behavior in zone reporting or write operations due to invalid calculations involving a zero zone size. While the exact impact on system stability or data integrity is not detailed, the issue relates to improper handling of zoned block device features, which could potentially lead to operational errors in storage management.

Summary

The Linux kernel's nvme-multipath code incorrectly set the BLK_FEAT_ZONED feature flag on the namespace head at allocation time based only on the command set identifier. If the zone info query returned a zero zone size, the path namespace was registered without zoned limits, but the head still advertised zoned capability with a zero zone size. This mismatch caused zone reporting or writes to the head to perform an invalid shift by ilog2(0). The vulnerability was fixed by removing the zoned feature from the head allocation and instead stacking it in from the path namespace after zone limits are refreshed.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 09:58 UTC

Technical details

References

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