VulnerabilityPublished 18 Oct 2026

CVE-2026-98616: Linux kernel · eth: fbnic: reset num_napi when the napi vectors are freed

Source GCVE Database

Authoritative record:CVE-2026-98616· High

Not known to be exploited · fixed in c5b5aee41b9f5ed0743344be1c7b544555fa3cb9 : patch Linux kernel soon.

Data as of 26 Oct 2026, 17:16 UTC

Severity

High

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 c5b5aee41b9f5ed0743344be1c7b544555fa3cb9, 4f4b767ffea7653a00904383908536e754f8ef5b, 4bcc4a92c603fe7f062cea22e20da2e0ad6b12c3

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-mr3q-wfmx-4w6m

What to do

Upgrade Linux kernel to c5b5aee41b9f5ed0743344be1c7b544555fa3cb9, 4f4b767ffea7653a00904383908536e754f8ef5b or 4bcc4a92c603fe7f062cea22e20da2e0ad6b12c3.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ bc6107771bb4be3009168cfda24d22131c026fe8, < c5b5aee41b9f5ed0743344be1c7b544555fa3cb9	Fixed in c5b5aee41b9f5ed0743344be1c7b544555fa3cb9
LinuxLinux	Affected ≥ bc6107771bb4be3009168cfda24d22131c026fe8, < 4f4b767ffea7653a00904383908536e754f8ef5b	Fixed in 4f4b767ffea7653a00904383908536e754f8ef5b
LinuxLinux	Affected ≥ bc6107771bb4be3009168cfda24d22131c026fe8, < 4bcc4a92c603fe7f062cea22e20da2e0ad6b12c3	Fixed in 4bcc4a92c603fe7f062cea22e20da2e0ad6b12c3
LinuxLinux	Affected =6.11	Fixed in–
Linuxlinux/kernel`pkg:rpm/linux/kernel`Other threats	Affected =6.11	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix has been implemented in the Linux kernel to clear the num_napi counter when napi vectors are freed during suspend teardown and resume open failure. Users should apply the official kernel updates containing this fix once available. No additional mitigation is indicated.

Description

A vulnerability in the Linux kernel's fbnic network driver involves improper handling of the num_napi counter when napi vectors are freed during suspend and resume operations. This can lead to a kernel NULL pointer dereference and crash when the network device is removed or unbound after certain failure scenarios in PCIe error recovery or resume open failures. The issue is resolved by clearing the num_napi count when the vectors are freed, preventing use-after-free dereferences.

References

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