CVE-2026-3497
Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions.
Does this matter?
Lower severity and a low EPSS score (2.22%). Track it; it rarely justifies an emergency change on its own.
Description
Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions. This vulnerability affects the GSSAPI patches added by various Linux distributions and does not affect the OpenSSH upstream project itself. The usage of sshpkt_disconnect() on an error, which does not terminate the process, allows an attacker to send an unexpected GSSAPI message type during the GSSAPI key exchange to the server, which will call the underlying function and continue the execution of the program without setting the related connection variables. As the variables are not initialized to NULL the code later accesses those uninitialized variables, accessing random memory, which could lead to undefined behavior. The recommended workaround is to use ssh_packet_disconnect() instead, which does terminate the process. The impact of the vulnerability depends heavily on the compiler flag hardening configuration.
- CVSS 4.0
- 6.9 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 2.22% probability · 83th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-908, CWE-824
- Affected
- canonical/ubuntu linux · openbsd/openssh · debian/debian linux · redhat/enterprise linux
- Source
- security@ubuntu.com
EPSS 2.2% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://ubuntu.com/security/CVE-2026-3497Third Party Advisory
- https://www.openwall.com/lists/oss-security/2026/03/12/3Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/03/12/3Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/03/14/3Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/03/14/4Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/03/18/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/03/18/4Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/03/18/5Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/03/18/7Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2026/04/msg00014.htmlMailing List, Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:10065
- https://access.redhat.com/errata/RHSA-2026:10714
- https://access.redhat.com/errata/RHSA-2026:12071
- https://access.redhat.com/errata/RHSA-2026:13750
- https://access.redhat.com/errata/RHSA-2026:13812
- https://access.redhat.com/errata/RHSA-2026:14773
- https://access.redhat.com/errata/RHSA-2026:14924
- https://access.redhat.com/errata/RHSA-2026:15087
- https://access.redhat.com/errata/RHSA-2026:15891
- https://access.redhat.com/errata/RHSA-2026:15893
- https://access.redhat.com/errata/RHSA-2026:16008
- https://access.redhat.com/errata/RHSA-2026:16009
- https://access.redhat.com/errata/RHSA-2026:16030
- https://access.redhat.com/errata/RHSA-2026:16174
- https://access.redhat.com/errata/RHSA-2026:17596
- https://access.redhat.com/errata/RHSA-2026:19724
- https://access.redhat.com/errata/RHSA-2026:19725
- https://access.redhat.com/errata/RHSA-2026:20040
- https://access.redhat.com/errata/RHSA-2026:20087
- https://access.redhat.com/errata/RHSA-2026:21690
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.