CVE-2026-13732 Red Hat CVE debrief

Who should care

Defenders responsible for GDB installations, especially in environments where untrusted ELF binaries may be processed, should assess exposure and prioritize patching. This includes operators, platform administrators, vulnerability managers, and security teams who need to ensure the security of GDB installations.

Why it matters

Defenders should prioritize patching GDB installations, especially in environments where untrusted ELF binaries may be processed, to prevent potential code execution within the GDB process.

• Potential code execution within the GDB process
• Symbol-inspection operations may trigger the out-of-bounds write

Technical summary

The read_member_functions() function in gdb/stabsread.c contains a linked list removal bug that causes an out-of-bounds write when the function list is copied to its final allocated array. The bug causes destructor entries to remain in the main function list while the list length counter is decremented. An attacker can craft an ELF binary with malicious .stab and .stabstr sections that triggers this out-of-bounds write when a user opens the file in GDB and performs any symbol-inspection operation such as setting a breakpoint.

Defensive priority

Defenders should prioritize patching GDB installations, especially in environments where untrusted ELF binaries may be processed.

Recommended defensive actions

• Patch GDB installations
• Restrict access to untrusted ELF binaries
• Monitor GDB usage for suspicious activity
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented. Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up. Review the
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description and affected products. The vulnerability is caused by a linked list removal bug in the read_member_functions() function in gdb/stabsread.c. This bug causes destructor entries to remain in the main function list while the list length counter is decremented, resulting in an out-of-bounds write when the function list is copied to its final allocated array. The inferior process does not need to be executed. Under controlled conditions, this was

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.