CVE-2026-21094 wpa_supplicant - Buffer Overflow

wpa_supplicant prior to SMR Sep-2026 Release 1 contains a buffer overflow caused by improper input validation, letting adjacent attackers write out-of-bounds memory remotely, exploit requires network adjacency.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.16% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
9 September 2026
Updated
15 October 2026
Weakness
CWE-20

Vendor fix

Update to SMR Sep-2026 Release 1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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