CVE-2026-13732 Gdb: gdb: out-of-bounds write in stabs parser read_member_functions() via crafted elf

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.

Exploitable avec un accès local à la machine, sans compte et si un utilisateur effectue une action ; un attaquant peut compromettre gravement la confidentialité, l’intégrité ou la disponibilité.

Vecteur d’attaque

Local

Complexité

Élevée

Privilèges requis

Aucun

Interaction

Requise

Portée

Inchangée

Confidentialité

Élevé

Intégrité

Élevé

Disponibilité

Élevé

Produits et versions touchés