Description
The eap_pwd_process function in eap_server/eap_server_pwd.c in hostapd 2.x before 2.6 does not validate that the reassembly buffer is large enough for the final fragment when used with (1) an internal EAP server or (2) a RADIUS server and EAP-pwd is enabled in a runtime configuration, which allows remote attackers to cause a denial of service (process termination) via a large final fragment in an EAP-pwd message.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | wpa | 2.3-2.3 | — |
| Debian 13 | wpa | 2.3-2.3 | — |
| Debian 12 | wpa | 2.3-2.3 | — |
| Debian 8 | wpa | 2.3-1+deb8u3 | DSA-3397-1 |
| Debian 7 | wpa | 1.0-3+deb7u3 | DSA-3397-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | wpa | 2.1-0ubuntu1.4 | USN-2808-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | hostapd | 2.6-1.1 | openSUSE-SU-2024:10022-1 |
Advisories 3
- DSA-3397-1 wpa - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-2808-1 wpa vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- openSUSE-SU-2024:10022-1 hostapd-2.6-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026