CVE-2026-93271

Wi-Fi frame drops via uncapped receive MCS

Published Sep 24, 2026 · Updated Sep 24, 2026

Improper receive metadata handling in Linux ath11k allows physically proximate attackers to trigger valid Wi-Fi frame drops. When ath11k_dp_rx_h_rate() receives an HT, VHT, or HE MCS above mac80211's representable range, it leaves rate_idx out of range and encoding at RX_ENC_LEGACY, causing mac80211's sanity check to reject the otherwise valid frame. Reachability requires compatible ath11k radio hardware and such a reported MCS; the observed consequence is the affected frame's loss and a kernel warning.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper receive metadata handling in Linux ath11k allows physically proximate attackers to trigger valid Wi-Fi frame drops. When ath11k_dp_rx_h_rate() receives an HT, VHT, or HE MCS above mac80211's representable range, it leaves rate_idx out of range and encoding at RX_ENC_LEGACY, causing mac80211's sanity check to reject the otherwise valid frame. Reachability requires compatible ath11k radio hardware and such a reported MCS; the observed consequence is the affected frame's loss and a kernel warning.

The record

CVE
CVE-2026-93271
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.6
  2. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <12b09e478aa7459b7893a695ef77682202f2da83
  3. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <2bb2a778a487305bd378db5fd5014fbdce4ada2c
  4. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <6ad04c3e2ec54bf5ec72c81afdd66318a116c539
  5. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <a0b3e6f9645d88f387c4fea546048a91952cd4cd
  6. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <a6b951f79e66fc8bd93a537ff1040fbfb567c8bf
  7. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <b77bfe6e59b98dff3ccfcf9b45fc27e3db498626
  8. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <ccbd20f2168f581d90265da1a925b9b6472a0b05
  9. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <fb7b9a7209f839c17c66484dfdc84c9a23c6fd2f

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=d5c65159f2895379e11ca13f62feabe93278985d <12b09e478aa7459b7893a695ef77682202f2da83; version=d5c65159f2895379e11ca13f62feabe93278985d <2bb2a778a487305bd378db5fd5014fbdce4ada2c; version=d5c65159f2895379e11ca13f62feabe93278985d <6ad04c3e2ec54bf5ec72c81afdd66318a116c539; version=d5c65159f2895379e11ca13f62feabe93278985d <a0b3e6f9645d88f387c4fea546048a91952cd4cd; version=d5c65159f2895379e11ca13f62feabe93278985d <a6b951f79e66fc8bd93a537ff1040fbfb567c8bf; version=d5c65159f2895379e11ca13f62feabe93278985d <b77bfe6e59b98dff3ccfcf9b45fc27e3db498626; version=d5c65159f2895379e11ca13f62feabe93278985d <ccbd20f2168f581d90265da1a925b9b6472a0b05; version=d5c65159f2895379e11ca13f62feabe93278985d <fb7b9a7209f839c17c66484dfdc84c9a23c6fd2f

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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