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Advisories

llama.cpp b7492–b9060 Use-After-Free RCE via llama-server

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severity
critical
date
Affecting

  • llama.cpp >= b7492, <= b9060

CWE
  • CWE-416 Use After Free
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSS
9.2
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Vladimir Tokarev (@G1ND1L4) - Vulnerability Research Tech Lead, Cyera, Ofek Itach (@ofekitach) - Security Research Team Lead, Cyera
Description
llama.cpp builds b7492 through the latest b9060 contains a use-after-free vulnerability in the vocab pointer of llama-server when the --sleep-idle-seconds feature is enabled, allowing unauthenticated remote attackers to execute arbitrary code. Attackers can trigger the vulnerability by sending requests to affected endpoints while the server transitions to sleep mode, causing concurrent worker threads to dereference a freed vocab pointer that can be reclaimed with attacker-controlled data to achieve remote code execution.

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