VulnerabilityPublished 18 Oct 2026

CVE-2026-98585: Linux kernel · eth: fbnic: Avoid rounding zero ring sizes

Source GCVE Database

Authoritative record:CVE-2026-98585

Not known to be exploited · fixed in 0160953d8eec75c3c55562158c46442ff1fd410b : update Linux kernel when convenient.

Data as of 26 Oct 2026, 12:55 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 0160953d8eec75c3c55562158c46442ff1fd410b, 491aa3167ae02f219cb2d2de6f4196d28dca03be, 92c9f2ea634d92adff5403d231ebeda683c5685a

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-pmrp-mw94-3ww9

What to do

Upgrade Linux kernel to 0160953d8eec75c3c55562158c46442ff1fd410b, 491aa3167ae02f219cb2d2de6f4196d28dca03be or 92c9f2ea634d92adff5403d231ebeda683c5685a.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 6cbf18a05c06090d867ef417a2a30b214d42d171, < 0160953d8eec75c3c55562158c46442ff1fd410b	Fixed in 0160953d8eec75c3c55562158c46442ff1fd410b
LinuxLinux	Affected ≥ 6cbf18a05c06090d867ef417a2a30b214d42d171, < 491aa3167ae02f219cb2d2de6f4196d28dca03be	Fixed in 491aa3167ae02f219cb2d2de6f4196d28dca03be
LinuxLinux	Affected ≥ 6cbf18a05c06090d867ef417a2a30b214d42d171, < 92c9f2ea634d92adff5403d231ebeda683c5685a	Fixed in 92c9f2ea634d92adff5403d231ebeda683c5685a
LinuxLinux	Affected =6.15	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to address this issue by modifying the rounding behavior and enforcing the minimum-size check for zero ring sizes. Users should update to the fixed kernel version once available. No additional mitigation is required beyond applying the official fix.

Description

A vulnerability in the Linux kernel's fbnic Ethernet driver was resolved by correcting how zero ring sizes are handled. The function roundup_pow_of_two() is undefined for zero, and ethtool allowed a zero ring size to reach the driver, bypassing the minimum-size check. The fix ensures zero ring sizes remain unchanged during rounding, allowing the minimum-size check to reject zero deterministically without affecting other values.

References

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