Metrics
Affected Vendors & Products
No advisories yet.
Solution
No solution given by the vendor.
Workaround
There is no mitigation for this vulnerability. gdbserver has no authentication mechanism; exposure is limited only by network access to the gdbserver port. --- CME Mitigation Guidance (2026-11-06) --- Disclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure. The highest-value action is to restrict network access to exposed gdbserver listening ports and eliminate untrusted agent-expression length handling in gdbserver: upgrade to the corresponding fixed Red Hat builds, which apply the documented input check, closing crafted agent-expression packet with declared length exceeding actual payload data. Until patched, this is a concern on Linux systems hosting gdbserver with an exposed listening port, so Restrict network access to the gdbserver listening port using host or network firewalls, limiting connectivity to trusted debugging clients only. As a compensating measure, Maintain SELinux in enforcing mode to confine the gdbserver process domain and limit host impact if heap disclosures are used to stage subsequent code execution. These controls limit blast radius and contain exploitation, but they do not fix the underlying length validation defect — apply the upstream patch to fully remediate. Highest-impact CME: CME-301 SELinux (Enforcing Mode) (medium)
Fri, 06 Nov 2026 19:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Fri, 06 Nov 2026 00:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| References |
| |
| Metrics |
threat_severity
|
threat_severity
|
Thu, 05 Nov 2026 18:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Red Hat
Red Hat enterprise Linux Redhat hardened Images |
|
| Vendors & Products |
Red Hat
Red Hat enterprise Linux Redhat hardened Images |
Thu, 05 Nov 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | A length validation flaw in gdbserver's agent-expression parser allows an unauthenticated remote attacker to read uninitialized heap memory from the gdbserver process and cause a denial of service. Disclosed heap content includes addresses suitable for defeating ASLR in further exploitation. | |
| Title | Gdb: gdbserver: heap disclosure and wild pointer in gdb_parse_agent_expr via untrusted agent-expression length | |
| First Time appeared |
Redhat
Redhat enterprise Linux Redhat hummingbird Redhat rhel Els |
|
| Weaknesses | CWE-822 | |
| CPEs | cpe:/a:redhat:enterprise_linux:10 cpe:/a:redhat:enterprise_linux:8 cpe:/a:redhat:enterprise_linux:9 cpe:/a:redhat:hummingbird:1 cpe:/o:redhat:rhel_els:6 cpe:/o:redhat:rhel_els:7 |
|
| Vendors & Products |
Redhat
Redhat enterprise Linux Redhat hummingbird Redhat rhel Els |
|
| References |
| |
| Metrics |
cvssV3_1
|
Projects
Sign in to view the affected projects.
Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-11-06T19:55:34.343Z
Reserved: 2026-11-04T13:28:12.839Z
Link: CVE-2026-121996
Updated: 2026-11-05T18:52:14.813Z
Status : Awaiting Analysis
Published: 2026-11-05T17:18:00.870
Modified: 2026-11-05T19:17:16.407
Link: CVE-2026-121996
OpenCVE Enrichment
Updated: 2026-11-05T17:45:06Z