Description
The EAP-pwd implementation in hostapd (EAP server) before 2.8 and wpa_supplicant (EAP peer) before 2.8 does not validate fragmentation reassembly state properly for a case where an unexpected fragment could be received. This could result in process termination due to a NULL pointer dereference (denial of service). This affects eap_server/eap_server_pwd.c and eap_peer/eap_pwd.c.
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 | 2:2.7+git20190128+0c1e29f-5 | — |
| Debian 13 | wpa | 2:2.7+git20190128+0c1e29f-5 | — |
| Debian 12 | wpa | 2:2.7+git20190128+0c1e29f-5 | — |
| Debian 9 | wpa | 2:2.4-1+deb9u4 | DSA-4450-1 |
| Debian 8 | wpa | 2.3-1+deb8u8 | DLA-1867-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | wpa | 2:2.6-15ubuntu2.3 | USN-3969-1 |
| Ubuntu 16.04 LTS | wpa | 2.4-0ubuntu6.5 | USN-3969-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | wpa | 2.1-0ubuntu1.7+esm1 | USN-3969-2 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | wpa_supplicant | 2.9-4.20.1 | SUSE-SU-2020:3380-1 |
| SLES 15 SP1 | wpa_supplicant | 2.9-4.20.1 | SUSE-SU-2020:3380-1 |
| SLES 15 | wpa_supplicant | 2.9-4.20.1 | SUSE-SU-2020:3380-1 |
| SLES 12 SP5 | wpa_supplicant | 2.9-23.3.1 | SUSE-SU-2020:3424-1 |
| SLES 12 SP4 | wpa_supplicant | 2.9-15.22.1 | SUSE-SU-2022:1853-1 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | wpa_supplicant | 2.9-15.22.1 | SUSE-SU-2022:1853-1 |
| SLES 12 SP2 | wpa_supplicant | 2.9-15.22.1 | SUSE-SU-2022:1853-1 |
| SLES for SAP 15 | wpa_supplicant | 2.9-4.20.1 | SUSE-SU-2020:3380-1 |
| SLES for SAP 12 SP5 | wpa_supplicant | 2.9-23.3.1 | SUSE-SU-2020:3424-1 |
| SLES for SAP 12 SP4 | wpa_supplicant | 2.9-15.22.1 | SUSE-SU-2022:1853-1 |
| SLES for SAP 12 SP3 | wpa_supplicant | 2.9-15.22.1 | SUSE-SU-2022:1853-1 |
| SLE HPC 15 | wpa_supplicant | 2.9-4.20.1 | SUSE-SU-2020:3380-1 |
| SUSE OpenStack Cloud Crowbar 9 | wpa_supplicant | 2.9-15.22.1 | SUSE-SU-2022:1853-1 |
| SUSE OpenStack Cloud Crowbar 8 | wpa_supplicant | 2.9-15.22.1 | SUSE-SU-2022:1853-1 |
| SUSE OpenStack Cloud 9 | wpa_supplicant | 2.9-15.22.1 | SUSE-SU-2022:1853-1 |
| SUSE OpenStack Cloud 8 | wpa_supplicant | 2.9-15.22.1 | SUSE-SU-2022:1853-1 |
| SUSE HPE Helion OpenStack 8 | wpa_supplicant | 2.9-15.22.1 | SUSE-SU-2022:1853-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | wpa_supplicant | 2.9-13.4 | openSUSE-SU-2024:11515-1 |
| openSUSE Leap 15.2 | wpa_supplicant | 2.9-lp152.8.3.1 | openSUSE-SU-2020:2059-1 |
| openSUSE Leap 15.1 | wpa_supplicant | 2.9-lp151.5.10.1 | openSUSE-SU-2020:2053-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | hostapd | 2.8-r0 | — |
| Alpine v3.24 | wpa_supplicant | 2.7-r3 | — |
| Alpine v3.23 | hostapd | 2.8-r0 | — |
| Alpine v3.23 | wpa_supplicant | 2.7-r3 | — |
| Alpine v3.22 | hostapd | 2.8-r0 | — |
| Alpine v3.22 | wpa_supplicant | 2.7-r3 | — |
| Alpine v3.21 | hostapd | 2.8-r0 | — |
| Alpine v3.21 | wpa_supplicant | 2.7-r3 | — |
| Alpine v3.20 | hostapd | 2.8-r0 | — |
| Alpine v3.20 | wpa_supplicant | 2.7-r3 | — |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | hostapd | 2.8-r0 | — |
| Alpine v3.19 | wpa_supplicant | 2.7-r3 | — |
| Alpine v3.18 | hostapd | 2.8-r0 | — |
| Alpine v3.18 | wpa_supplicant | 2.7-r3 | — |
| Alpine v3.17 | hostapd | 2.8-r0 | — |
| Alpine v3.17 | wpa_supplicant | 2.7-r3 | — |
| Alpine v3.16 | hostapd | 2.8-r0 | — |
| Alpine v3.16 | wpa_supplicant | 2.7-r3 | — |
| Alpine v3.15 | hostapd | 2.8-r0 | — |
| Alpine v3.15 | wpa_supplicant | 2.7-r3 | — |
| Alpine v3.14 | hostapd | 2.8-r0 | — |
| Alpine v3.14 | wpa_supplicant | 2.7-r3 | — |
| Alpine v3.13 | hostapd | 2.8-r0 | — |
| Alpine v3.13 | wpa_supplicant | 2.7-r3 | — |
| Alpine v3.12 | hostapd | 2.8-r0 | — |
| Alpine v3.12 | wpa_supplicant | 2.7-r3 | — |
| Alpine v3.11 | hostapd | 2.8-r0 | — |
| Alpine v3.11 | wpa_supplicant | 2.7-r3 | — |
| Alpine v3.10 | hostapd | 2.8-r0 | — |
| Alpine v3.10 | wpa_supplicant | 2.7-r3 | — |
| Alpine v3.9 | hostapd | 2.7-r1 | — |
| Alpine v3.9 | wpa_supplicant | 2.7-r3 | — |
| Alpine v3.8 | hostapd | 2.6-r5 | — |
| Alpine v3.8 | wpa_supplicant | 2.6-r15 | — |
| Alpine v3.7 | hostapd | 2.6-r4 | — |
| Alpine v3.7 | wpa_supplicant | 2.6-r10 | — |
Advisories 10
- DSA-4450-1 wpa - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1867-1 wpa - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3969-1 wpa vulnerability Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-3969-2 wpa vulnerability Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2022:1853-1 Security update for wpa_supplicant SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11515-1 wpa_supplicant-2.9-13.4 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3424-1 Security update for wpa_supplicant SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:2053-1 Security update for wpa_supplicant SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3380-1 Security update for wpa_supplicant SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:2059-1 Security update for wpa_supplicant SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://www.openwall.com/lists/oss-security/2019/04/18/6
- https://w1.fi/security/2019-5/eap-pwd-message-reassembly-issue-with-unexpected-fragment.txt
- https://w1.fi/security/2019-5/
- [oss-security] 20190426 Re: wpa_supplicant/hostapd: EAP-pwd message reassembly issue with unexpected fragment mailing-list
- USN-3969-1 vendor-advisory
- USN-3969-2 vendor-advisory
- FEDORA-2019-ff1b728d09 vendor-advisory
- FreeBSD-SA-19:03 vendor-advisory
- 20190515 FreeBSD Security Advisory FreeBSD-SA-19:03.wpa mailing-list
- DSA-4450 vendor-advisory
- 20190527 [SECURITY] [DSA 4450-1] wpa security update mailing-list
- FEDORA-2019-28d3ca93d2 vendor-advisory
- [debian-lts-announce] 20190731 [SECURITY] [DLA 1867-1] wpa security update mailing-list
- FEDORA-2019-d6bc3771a4 vendor-advisory
- GLSA-201908-25 vendor-advisory