VulnerabilityPublished 25 Jun 2026Updated 6 Nov 2026

CVE-2026-53257: Linux kernel · wifi: cfg80211: enforce HE/EHT cap/oper consistency

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in cb9959ab5f99611d27a06586add84811fe8102dc : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:49 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 cb9959ab5f99611d27a06586add84811fe8102dc, afe815a67ec8f2fd03c261fb64f5cde7eb05c17a, 0f5e9ddd7e8e7758771a63cdd498a2007dc8da7a

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Jun 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 cb9959ab5f99611d27a06586add84811fe8102dc, afe815a67ec8f2fd03c261fb64f5cde7eb05c17a or 0f5e9ddd7e8e7758771a63cdd498a2007dc8da7a.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 22c64f37e1d4e757b0073a72f1439c2c3509c5cb, < cb9959ab5f99611d27a06586add84811fe8102dc	Fixed in cb9959ab5f99611d27a06586add84811fe8102dc
LinuxLinux	Affected ≥ 22c64f37e1d4e757b0073a72f1439c2c3509c5cb, < afe815a67ec8f2fd03c261fb64f5cde7eb05c17a	Fixed in afe815a67ec8f2fd03c261fb64f5cde7eb05c17a
LinuxLinux	Affected ≥ 22c64f37e1d4e757b0073a72f1439c2c3509c5cb, < 0f5e9ddd7e8e7758771a63cdd498a2007dc8da7a	Fixed in 0f5e9ddd7e8e7758771a63cdd498a2007dc8da7a
LinuxLinux	Affected =6.16	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: enforce HE/EHT cap/oper consistency Xiang Mei reports that mac80211 could crash if eht_cap is set but eht_oper isn't. Rather than fixing that for the individual user(s), enforce that both HE/EHT have consistent elements.

References

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