Description
A flaw was found in GDB's STABS debug format parser. The read_member_functions() function in gdb/stabsread.c contains a linked list removal bug in the code that separates destructor and non-destructor member functions of C++ classes. The bug causes the 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. 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. The inferior process does not need to be executed. Under controlled conditions, this was demonstrated to achieve execution of arbitrary commands within the GDB process.
References10
- access.redhat.com/errata/RHSA-2026:73425
- access.redhat.com/errata/RHSA-2026:73426
- access.redhat.com/errata/RHSA-2026:73427
- access.redhat.com/errata/RHSA-2026:79357
- access.redhat.com/errata/RHSA-2026:82447
- access.redhat.com/errata/RHSA-2026:82939
- access.redhat.com/errata/RHSA-2026:96095
- access.redhat.com/errata/RHSA-2026:96096
- access.redhat.com/errata/RHSA-2026:96097
- access.redhat.com/errata/RHSA-2026:96098
Metrics
- CVSS 3.1
-
7.0
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 3 · as of 8 November 2026
- CWE
- CWE-787
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.