VulnerabilityPublished 17 Sep 2026Updated 19 Oct 2026

CVE-2026-92515: Linux kernel · bpf: Preserve unique-field state across nested structs

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in f08619f060468076e4acbdc10e0713af20d60e65 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Unrated

Rated by Threat Radar · 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 f08619f060468076e4acbdc10e0713af20d60e65, cec97102d4147e18568c93946014c4c8ebf86fcf, 373a1e9366e711b89bc5e45bd6edf33ef62402cd +1

Exploitation evidence

Disclosed: evidence found.
CVE published 17 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 Linux kernel to f08619f060468076e4acbdc10e0713af20d60e65, cec97102d4147e18568c93946014c4c8ebf86fcf, 373a1e9366e711b89bc5e45bd6edf33ef62402cd or 28d5f20ed022ade0fb0bfbf50b78fec782083175.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 64e8ee814819f21beeeda00d4119221443d77992, < f08619f060468076e4acbdc10e0713af20d60e65	Fixed in f08619f060468076e4acbdc10e0713af20d60e65
LinuxLinux	Affected ≥ 64e8ee814819f21beeeda00d4119221443d77992, < cec97102d4147e18568c93946014c4c8ebf86fcf	Fixed in cec97102d4147e18568c93946014c4c8ebf86fcf
LinuxLinux	Affected ≥ 64e8ee814819f21beeeda00d4119221443d77992, < 373a1e9366e711b89bc5e45bd6edf33ef62402cd	Fixed in 373a1e9366e711b89bc5e45bd6edf33ef62402cd
LinuxLinux	Affected ≥ 64e8ee814819f21beeeda00d4119221443d77992, < 28d5f20ed022ade0fb0bfbf50b78fec782083175	Fixed in 28d5f20ed022ade0fb0bfbf50b78fec782083175
LinuxLinux	Affected =6.11	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Preserve unique-field state across nested structs btf_find_struct_field() initializes a fresh seen mask for every recursive descent. Unique special fields in different levels of the same aggregate therefore do not see one another. The duplicate fields can reach btf_parse_fields(), where they trigger an invariant WARN_ON_ONCE(). A crafted user BTF can consequently trigger the warning before map creation checks capabilities. Initialize the seen mask once in btf_find_field() and pass the same pointer through struct, datasec, and nested-struct walks. This gives the entire field traversal one shared uniqueness state.

References

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