VulnerabilityPublished 25 Sep 2026Updated 21 Oct 2026

CVE-2026-100074: Linux kernel · bpf: Mark bpf_refcount field as unique

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in e42cede6f90177f4f92f80d3de18f628e61d2087 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:18 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in e42cede6f90177f4f92f80d3de18f628e61d2087, 641f814965d733936ca3618d4d5a12a8fa9be00e, 61e655391cb19c31f94ecd4354f624c81ce4cf75 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Sep 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 to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ d54730b50bae1f3119bd686d551d66f0fcc387ca, < e42cede6f90177f4f92f80d3de18f628e61d2087	Fixed in e42cede6f90177f4f92f80d3de18f628e61d2087
LinuxLinux	Affected ≥ d54730b50bae1f3119bd686d551d66f0fcc387ca, < 641f814965d733936ca3618d4d5a12a8fa9be00e	Fixed in 641f814965d733936ca3618d4d5a12a8fa9be00e
LinuxLinux	Affected ≥ d54730b50bae1f3119bd686d551d66f0fcc387ca, < 61e655391cb19c31f94ecd4354f624c81ce4cf75	Fixed in 61e655391cb19c31f94ecd4354f624c81ce4cf75
LinuxLinux	Affected ≥ d54730b50bae1f3119bd686d551d66f0fcc387ca, < 20b3c72c1b83054c568d2322a95e217fdc281bc3	Fixed in 20b3c72c1b83054c568d2322a95e217fdc281bc3
LinuxLinux	Affected ≥ d54730b50bae1f3119bd686d551d66f0fcc387ca, < 015f9fbcf3382c5eb563a157ee8cabb6fbfcfe5e	Fixed in 015f9fbcf3382c5eb563a157ee8cabb6fbfcfe5e
LinuxLinux	Affected =6.4	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Mark bpf_refcount field as unique BPF_REFCOUNT is not marked as a unique field, while it should be. Fix this oversight.

References

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