CVE-2026-63869

Kernel memory corruption via unchecked antenna shift

Published Jul 19, 2026 · Updated Jul 19, 2026

Undefined behavior in Linux Kernel allows local users to corrupt kernel memory through a crafted radiotap frame during Wi-Fi injection. ieee80211_parse_tx_radiotap passes the untrusted 8-bit IEEE80211_RADIOTAP_ANTENNA value directly to BIT() as a shift count, although the destination bitmap represents only indices 0 and 1. The path requires Wi-Fi hardware in monitor mode plus CAP_NET_RAW and CAP_NET_ADMIN; user namespaces can grant those capabilities, and the corruption exposes kernel confidentiality, integrity, and stability.

CVSS severity7.6
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Undefined behavior in Linux Kernel allows local users to corrupt kernel memory through a crafted radiotap frame during Wi-Fi injection. ieee80211_parse_tx_radiotap passes the untrusted 8-bit IEEE80211_RADIOTAP_ANTENNA value directly to BIT() as a shift count, although the destination bitmap represents only indices 0 and 1. The path requires Wi-Fi hardware in monitor mode plus CAP_NET_RAW and CAP_NET_ADMIN; user namespaces can grant those capabilities, and the corruption exposes kernel confidentiality, integrity, and stability.

The record

CVE
CVE-2026-63869
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=6.7
  2. Affected versionversion=ef246a1480cc484cd2aeda75737cb0848616ddf3 <033ce021a220913ac02416fcb5ac883a9ff8b6c7
  3. Affected versionversion=ef246a1480cc484cd2aeda75737cb0848616ddf3 <6c0cf89f36ac0c0fd8687a4ccdce2efb23a9c663
  4. Affected versionversion=ef246a1480cc484cd2aeda75737cb0848616ddf3 <9b40c59bab08f2a99abf969cc0bb92fa49de004b
  5. Affected versionversion=ef246a1480cc484cd2aeda75737cb0848616ddf3 <f6d3dc8e8492bf8435e0b23c99472af7bafd6b44

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.7; version=ef246a1480cc484cd2aeda75737cb0848616ddf3 <033ce021a220913ac02416fcb5ac883a9ff8b6c7; version=ef246a1480cc484cd2aeda75737cb0848616ddf3 <6c0cf89f36ac0c0fd8687a4ccdce2efb23a9c663; version=ef246a1480cc484cd2aeda75737cb0848616ddf3 <9b40c59bab08f2a99abf969cc0bb92fa49de004b; version=ef246a1480cc484cd2aeda75737cb0848616ddf3 <f6d3dc8e8492bf8435e0b23c99472af7bafd6b44

Published CVSS scores

7.6Linux kernel CNACVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

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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