Out-of-bounds read in Red Hat Enterprise Linux 10
Priority LOW 19CWE-125Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Partial Red Hat: 6 fixed, 2 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
A flaw was found in OpenSSH. This vulnerability, a heap out-of-bounds read, occurs during the cleanup of GSSAPI (Generic Security Service Application Programming Interface) indicators when a trailing NULL termination is missing in the auth-indicators array. A remote attacker, under specific configurations involving GSSAPI authentication and a Kerberos environment, could exploit this to cause the SSH authentication path to crash or abort. This leads to a denial of service (DoS), impacting the availability of the SSH service.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00652 51st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 5 advisoriesRed Hat: 6 fixed, 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | 9.9p1-25.el10_2 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9 | — | 9.9p1-9.el9_8 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9 | — | 9.9p1-9.el9_8 | Patch available | CNA |
| Red Hat | Red Hat Hardened Images | — | 10.3p1-6.hum1 | Patch available | CNA |
| Red Hat | Red Hat Update Infrastructure 5 | — | 1786435483 | Patch available | CNA |
| Red Hat | Red Hat Update Infrastructure 5 | — | 1786533529 | Patch available | CNA |
| Red Hat | Red Hat Update Infrastructure 5 | — | 1787135742 | Patch available | CNA |
| Red Hat | Red Hat Update Infrastructure 5 | — | 1787241260 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 6 | — | — | Not affected | CNA |
| Red Hat | Red Hat Enterprise Linux 7 | — | — | Not affected | CNA |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | Not affected | CNA |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — | No fix listed | CNA |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — | No fix listed | CNA |
| Red Hat | Red Hat OpenShift Container Platform 5 | — | — | No fix listed | CNA |
- Red Hat Enterprise Linux 10 VendorRed Hat Affected — Fixed in 9.9p1-25.el10_2 Patch available CNA
- Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 9.9p1-9.el9_8 Patch available CNA
- Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 9.9p1-9.el9_8 Patch available CNA
- Red Hat Hardened Images VendorRed Hat Affected — Fixed in 10.3p1-6.hum1 Patch available CNA
- Red Hat Update Infrastructure 5 VendorRed Hat Affected — Fixed in 1786435483 Patch available CNA
- Red Hat Update Infrastructure 5 VendorRed Hat Affected — Fixed in 1786533529 Patch available CNA
- Red Hat Update Infrastructure 5 VendorRed Hat Affected — Fixed in 1787135742 Patch available CNA
- Red Hat Update Infrastructure 5 VendorRed Hat Affected — Fixed in 1787241260 Patch available CNA
- Red Hat Enterprise Linux 6 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat OpenShift Container Platform 4 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat OpenShift Container Platform 4 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat OpenShift Container Platform 5 VendorRed Hat Affected — Fixed in — No fix listed CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:openbsd:openssh:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | OpenBSD |
| cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* | 6.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* | 8.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Red Hat |
- cpe:2.3:a:openbsd:openssh:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·OpenBSD
- cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Red Hat
Remediation
Red Hat 5 advisories
- RHSA-2026:58981 Released 2026-08-24 · Red Hat rating CriticalRed Hat Update Infrastructure 5.3 Technology Preview security update
- Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-kubernetes-tp-rhel9, registry.redhat.io/rhui5/installer-tp-rhel9, registry.redhat.io/rhui5/rhua-tp-rhel9
- RHSA-2026:54387 Released 2026-08-12 · Red Hat rating ImportantRed Hat Update Infrastructure 5.2 security update
- Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-kubernetes-rhel9, registry.redhat.io/rhui5/cds-rhel9, registry.redhat.io/rhui5/haproxy-rhel9 +2
- RHSA-2026:47757 Released 2026-07-30 · Red Hat rating Importantopenssh security update
- Red Hat Enterprise Linux AppStream (v. 10) openssh-askpass-9.9p1-25.el10_2, openssh-keysign-9.9p1-25.el10_2
- Red Hat Enterprise Linux BaseOS (v. 10) openssh-9.9p1-25.el10_2, openssh-clients-9.9p1-25.el10_2, openssh-keycat-9.9p1-25.el10_2 +1
Show 2 more Red Hat advisories
- RHSA-2026:47756 Released 2026-07-29 · Red Hat rating Importantopenssh security update
- Red Hat Enterprise Linux AppStream (v. 9) openssh-askpass-9.9p1-9.el9_8, pam_ssh_agent_auth-0.10.4-7.9.el9_8
- Red Hat Enterprise Linux BaseOS (v. 9) openssh-9.9p1-9.el9_8, openssh-clients-9.9p1-9.el9_8, openssh-keycat-9.9p1-9.el9_8 +1
- RHSA-2026:36759 Released 2026-07-08 · Red Hat rating ModerateRed Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images openssh-10.3p1-6.hum1@aarch64, openssh-10.3p1-6.hum1@src, openssh-10.3p1-6.hum1@x86_64 +12
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 and 7 more products — RHSA-2026:54387
4 records Highest priority Priority LOW 4 LOW
Other records, highest priority first
- TI-2026-40178 Double free in Red Hat Enterprise Linux 10Priority LOW 29
- TI-2026-11598 P11-kit: stack exhaustion via unbounded recursion in rpc attribute parsingPriority LOW 27
- TI-2026-40180 Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat…Priority LOW 26
- Advisory ·
Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 and 7 more products — RHSA-2026:36759
3 records Highest priority Priority LOW 3 LOW
Other records, highest priority first
- TI-2026-40178 Double free in Red Hat Enterprise Linux 10Priority LOW 29
- TI-2026-40180 Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat…Priority LOW 26
Show 2 more groups
- Advisory ·
Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 and 7 more products — RHSA-2026:47756
3 records Highest priority Priority LOW 3 LOW
Other records, highest priority first
- TI-2026-40178 Double free in Red Hat Enterprise Linux 10Priority LOW 29
- TI-2026-40180 Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat…Priority LOW 26
- Advisory ·
Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 and 7 more products — RHSA-2026:47757
3 records Highest priority Priority LOW 3 LOW
Other records, highest priority first
- TI-2026-40178 Double free in Red Hat Enterprise Linux 10Priority LOW 29
- TI-2026-40180 Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat…Priority LOW 26
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:47757 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:47756 |
| Red Hat Enterprise Linux BaseOS (v. 10) | Fixed | RHSA-2026:47757 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2026:47756 |
| Red Hat Hardened Images | Fixed | RHSA-2026:36759 |
| Red Hat Update Infrastructure 5 | Fixed | RHSA-2026:54387, RHSA-2026:58981 |
Not affected: 4 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Update Infrastructure 5
Timeline
- 2026-10-02 Threatist record created from CVE-2026-55654
- 2026-10-03 Alias added: GHSA-5mx2-7g4j-9m39
- 2026-10-14 EPSS moved to the 50th–90th percentile
- 2026-11-06 Affected versions changed · CNA
- 2026-11-07 Affected versions changed · Red Hat
References
More Red Hat Enterprise Linux vulnerabilities
- TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
- TI-2018-10530 Code injection in [UNKNOWN] RichFaces KEVCVSS 3.1CRITICAL 9.8
- TI-2014-05975 GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed… KEVCVSS 3.1CRITICAL 9.8
- TI-2014-05157 GNU Bash through 4.3 processes trailing strings after function definitions in the values… KEVCVSS 3.1CRITICAL 9.8
- TI-2025-23530 Sudo before 1.9.17p1 allows local users to obtain root access because /etc/nsswitch.conf… KEVCVSS 3.1CRITICAL 9.3
- TI-2021-17490 mod_proxy SSRF KEVCVSS 3.1CRITICAL 9.0
Sources
- CVE-2026-55654 · CVE Program
- CVE-2026-55654 · NVD
- FIRST EPSS
- GHSA-5mx2-7g4j-9m39 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-55654 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences