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.
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Advisories
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Fixes
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.
References
History
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 |
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| 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 |
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| Vendors & Products |
Redhat
Redhat enterprise Linux Redhat hummingbird Redhat rhel Els |
|
| References |
| |
| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-11-05T16:08:52.127Z
Reserved: 2026-11-04T13:28:12.839Z
Link: CVE-2026-121996
No data.
Status : Awaiting Analysis
Published: 2026-11-05T17:18:00.870
Modified: 2026-11-05T17:18:01.010
Link: CVE-2026-121996
No data.
OpenCVE Enrichment
No data.
Weaknesses