CVE-2026-3497
Summary
| CVE | CVE-2026-3497 |
|---|---|
| State | PUBLISHED |
| Assigner | canonical |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-03-12 19:16:19 UTC |
| Updated | 2026-07-15 02:21:00 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 6.9 MEDIUM from [email protected]
CVSS: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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS: 0.021800000 probability, percentile 0.803500000 (date 2026-07-18)
Problem Types: CWE-908 | CWE-824 | CWE-908 CWE-908 Use of Uninitialized Resource | CWE-824 Access of Uninitialized Pointer
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 6.9 | MEDIUM | CVSS: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/C... |
| 4.0 | CNA | CVSS | 2.7 | LOW | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N |
| 3.1 | [email protected] | Primary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | ADP | CVSS | 8.2 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 8.2 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H |
CVSS v4.0 Breakdown
CVSS: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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Canonical | Ubuntu Linux | 25.10 | All | All | All |
| Operating System | Canonical | Ubuntu Linux | 20.04 | All | All | All |
| Operating System | Canonical | Ubuntu Linux | 22.04 | All | All | All |
| Operating System | Canonical | Ubuntu Linux | 24.04 | All | All | All |
| Operating System | Debian | Debian Linux | 11.0 | All | All | All |
| Application | Openbsd | Openssh | - | All | All | All |
| Operating System | Redhat | Enterprise Linux | 10.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 8.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 9.0 | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Ubuntu | Openssh | affected 1:10.0p1-5ubuntu5 1:10.0p1-5ubuntu5.1 dpkg | Not specified |
| CNA | Ubuntu | Openssh | affected 1:9.6p1-3ubuntu13 1:9.6p1-3ubuntu13.15 dpkg | Not specified |
| CNA | Ubuntu | Openssh | affected 1:8.9p1-3 1:8.9p1-3ubuntu0.14 dpkg | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 10 | unaffected 0:9.9p1-13.el10_1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | unaffected 0:9.9p1-7.el10_0.2 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8 | unaffected 0:8.0p1-28.el8_10 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | unaffected 0:8.0p1-7.el8_4.1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | unaffected 0:8.0p1-7.el8_4.1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | unaffected 0:8.0p1-15.el8_6.4 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8.6 Telecommunications Update Service | unaffected 0:8.0p1-15.el8_6.4 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8.6 Update Services For SAP Solutions | unaffected 0:8.0p1-15.el8_6.4 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | unaffected 0:8.0p1-20.el8_8.3 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions | unaffected 0:8.0p1-20.el8_8.3 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:8.7p1-48.el9_7 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9.0 Update Services For SAP Solutions | unaffected 0:8.7p1-13.el9_0.2 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions | unaffected 0:8.7p1-30.el9_2.10 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | unaffected 0:8.7p1-38.el9_4.7 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | unaffected 0:8.7p1-45.el9_6.2 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Container Platform 4.12 | unaffected 412.86.202605271418-0 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Container Platform 4.13 | unaffected 413.92.202605271328-0 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Container Platform 4.14 | unaffected 414.92.202605060243-0 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Container Platform 4.15 | unaffected 415.92.202605060220-0 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Container Platform 4.16 | unaffected 416.94.202605200242-0 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Container Platform 4.17 | unaffected 417.94.202605112123-0 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Container Platform 4.18 | unaffected 418.94.202604240015-0 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Container Platform 4.19 | unaffected 4.19.9.6.202605201155-0 * rpm | Not specified |
| ADP | Red Hat | RHEL-8 Based Middleware Containers | unaffected 7.13.5-4.1777325677 * rpm | Not specified |
| ADP | Red Hat | RHEL-8 Based Middleware Containers | unaffected 7.13.5-4.1777325711 * rpm | Not specified |
| ADP | Red Hat | RHEL-8 Based Middleware Containers | unaffected 7.13.5-4.1777325710 * rpm | Not specified |
| ADP | Red Hat | RHEL-8 Based Middleware Containers | unaffected 7.13.5-3.1777325680 * rpm | Not specified |
| ADP | Red Hat | RHEL-8 Based Middleware Containers | unaffected 7.13.5-4.1777325709 * rpm | Not specified |
| ADP | Red Hat | RHEL-8 Based Middleware Containers | unaffected 7.13.5-4.1777325680 * rpm | Not specified |
| ADP | Red Hat | RHEL-8 Based Middleware Containers | unaffected 7.13.5-4.1777325708 * rpm | Not specified |
| ADP | Red Hat | Red Hat AI Inference Server 3.2 | unaffected 1779223654 * rpm | Not specified |
| ADP | Red Hat | Red Hat AI Inference Server 3.2 | unaffected 1779223651 * rpm | Not specified |
| ADP | Red Hat | Red Hat AI Inference Server 3.2 | unaffected 1780681984 * rpm | Not specified |
| ADP | Red Hat | Red Hat AI Inference Server 3.3 | unaffected 1778244559 * rpm | Not specified |
| ADP | Red Hat | Red Hat AI Inference Server 3.3 | unaffected 1778244531 * rpm | Not specified |
| ADP | Red Hat | Red Hat AI Inference Server 3.3 | unaffected 1778274666 * rpm | Not specified |
| ADP | Red Hat | Red Hat AI Inference Server 3.3 | unaffected 1778244546 * rpm | Not specified |
| ADP | Red Hat | Red Hat Hardened Images | unaffected 10.2p1-9.hum1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Update Infrastructure 5 | unaffected 1776868772 * rpm | Not specified |
| ADP | Red Hat | Red Hat Update Infrastructure 5 | unaffected 1776868842 * rpm | Not specified |
| ADP | Red Hat | Multicluster Engine For Kubernetes | Not specified | Not specified |
| ADP | Red Hat | OpenShift Pipelines | Not specified | Not specified |
| ADP | Red Hat | Red Hat Advanced Cluster Management For Kubernetes 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 7 | Not specified | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
| ADP | Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/errata/RHSA-2026:6462 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:15891 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| www.openwall.com/lists/oss-security/2026/03/18/4 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | Mailing List, Third Party Advisory |
| lists.debian.org/debian-lts-announce/2026/04/msg00014.html | af854a3a-2127-422b-91ae-364da2661108 | lists.debian.org | Mailing List, Third Party Advisory |
| www.openwall.com/lists/oss-security/2026/03/18/5 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | Mailing List, Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:25096 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:16030 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:14773 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-3497 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| www.openwall.com/lists/oss-security/2026/03/18/7 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | Mailing List, Third Party Advisory |
| www.openwall.com/lists/oss-security/2026/03/12/3 | [email protected] | www.openwall.com | Mailing List, Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:16009 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| www.openwall.com/lists/oss-security/2026/03/12/3 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | Mailing List, Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:13750 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:20087 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:17596 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:15893 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| www.openwall.com/lists/oss-security/2026/03/18/2 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | Mailing List, Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:19725 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:15087 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| cert-portal.siemens.com/productcert/html/ssa-019113.html | 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e | cert-portal.siemens.com | |
| access.redhat.com/errata/RHSA-2026:16174 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:9415 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| www.openwall.com/lists/oss-security/2026/03/14/4 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | Mailing List, Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:10714 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:10065 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:16008 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:21690 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:13812 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:21695 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:12071 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:19724 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:20040 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3497.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:9732 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:5475 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| ubuntu.com/security/CVE-2026-3497 | [email protected] | ubuntu.com | Third Party Advisory |
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | |
| access.redhat.com/errata/RHSA-2026:7107 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:6463 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:6461 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| www.openwall.com/lists/oss-security/2026/03/14/3 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | Mailing List, Third Party Advisory |
| access.redhat.com/errata/RHSA-2026:14924 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Jeremy Brown (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2026-03-12T19:01:37.007Z | Reported to Red Hat. |
| ADP | 2026-03-12T18:27:44.917Z | Made public. |
Solutions
ADP: RHSA-2026:21695: Red Hat OpenShift Container Platform 4.12
ADP: RHSA-2026:13812: Middleware Containers for OpenShift
ADP: RHSA-2026:21690: Red Hat OpenShift Container Platform 4.13
ADP: RHSA-2026:15087: Red Hat OpenShift Container Platform 4.14
ADP: RHSA-2026:14773: Red Hat OpenShift Container Platform 4.15
ADP: RHSA-2026:20087: Red Hat OpenShift Container Platform 4.16
ADP: RHSA-2026:17596: Red Hat OpenShift Container Platform 4.17
ADP: RHSA-2026:12071: Red Hat OpenShift Container Platform 4.18
ADP: RHSA-2026:20040: Red Hat OpenShift Container Platform 4.19
ADP: RHSA-2026:7107: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
ADP: RHSA-2026:6463: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10)
ADP: RHSA-2026:6461: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux BaseOS (v. 8)
ADP: RHSA-2026:15891: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4), Red Hat Enterprise Linux BaseOS AUS (v.8.4), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
ADP: RHSA-2026:15893: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream E4S (v.8.6), Red Hat Enterprise Linux AppStream TUS (v.8.6), Red Hat Enterprise Linux BaseOS AUS (v.8.6), Red Hat Enterprise Linux BaseOS E4S (v.8.6), Red Hat Enterprise Linux BaseOS TUS (v.8.6)
ADP: RHSA-2026:14924: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8), Red Hat Enterprise Linux BaseOS E4S (v.8.8), Red Hat Enterprise Linux BaseOS TUS (v.8.8)
ADP: RHSA-2026:13750: Red Hat Enterprise Linux AppStream E4S (v.9.0), Red Hat Enterprise Linux BaseOS E4S (v.9.0)
ADP: RHSA-2026:10714: Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux BaseOS E4S (v.9.2)
ADP: RHSA-2026:9732: Red Hat Enterprise Linux AppStream EUS (v.9.4), Red Hat Enterprise Linux BaseOS EUS (v.9.4)
ADP: RHSA-2026:9415: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6)
ADP: RHSA-2026:6462: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9)
ADP: RHSA-2026:25096: Red Hat AI Inference Server 3.2
ADP: RHSA-2026:19724: Red Hat AI Inference Server 3.2
ADP: RHSA-2026:19725: Red Hat AI Inference Server 3.2
ADP: RHSA-2026:16008: Red Hat AI Inference Server 3.3
ADP: RHSA-2026:16030: Red Hat AI Inference Server 3.3
ADP: RHSA-2026:16009: Red Hat AI Inference Server 3.3
ADP: RHSA-2026:16174: Red Hat AI Inference Server 3.3
ADP: RHSA-2026:5475: Red Hat Hardened Images
ADP: RHSA-2026:10065: Red Hat Update Infrastructure 5
Workarounds
ADP: To mitigate this issue, disable GSSAPI key exchange in the OpenSSH server configuration. This prevents the server from processing GSSAPI messages, eliminating the vulnerability's attack surface. Edit `/etc/ssh/sshd_config` and add or modify the line: ``` GSSAPIKeyExchange no ``` After saving the changes, restart the `sshd` service for the mitigation to take effect. This action will prevent users from authenticating via GSSAPI. ``` # systemctl restart sshd ```