VulnerabilityPublished 28 May 2026Updated 6 Nov 2026

CVE-2026-46188: Linux kernel · octeon_ep_vf: add NULL check for napi_build_skb()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in dd66b42854705e4e4ee7f14d260f86c578bed3e3 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:34 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in dd66b42854705e4e4ee7f14d260f86c578bed3e3, b0f4711b426a06fb4c4be85c36b9f5588d5140d3, 60246cdd4c515ea7d920cddf48932efcb990773e +1

Exploitation evidence

Disclosed: evidence found.
CVE published 28 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 6 Nov 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), 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 dd66b42854705e4e4ee7f14d260f86c578bed3e3, b0f4711b426a06fb4c4be85c36b9f5588d5140d3, 60246cdd4c515ea7d920cddf48932efcb990773e or 6fef6640bbf360e254cc0174365ed30ce3a07572.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 1cd3b407977c3ab1d2ddc26cb7113e7fb1509cd1, < dd66b42854705e4e4ee7f14d260f86c578bed3e3	Fixed in dd66b42854705e4e4ee7f14d260f86c578bed3e3
LinuxLinux	Affected ≥ 1cd3b407977c3ab1d2ddc26cb7113e7fb1509cd1, < b0f4711b426a06fb4c4be85c36b9f5588d5140d3	Fixed in b0f4711b426a06fb4c4be85c36b9f5588d5140d3
LinuxLinux	Affected ≥ 1cd3b407977c3ab1d2ddc26cb7113e7fb1509cd1, < 60246cdd4c515ea7d920cddf48932efcb990773e	Fixed in 60246cdd4c515ea7d920cddf48932efcb990773e
LinuxLinux	Affected ≥ 1cd3b407977c3ab1d2ddc26cb7113e7fb1509cd1, < 6fef6640bbf360e254cc0174365ed30ce3a07572	Fixed in 6fef6640bbf360e254cc0174365ed30ce3a07572
LinuxLinux	Affected =6.9	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: octeon_ep_vf: add NULL check for napi_build_skb() napi_build_skb() can return NULL on allocation failure. In __octep_vf_oq_process_rx(), the result is used directly without a NULL check in both the single-buffer and multi-fragment paths, leading to a NULL pointer dereference. Add NULL checks after both napi_build_skb() calls, properly advancing descriptors and consuming remaining fragments on failure.

References

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