CVE-2025-7403: zephyrproject-rtos zephyr Write-what-where Condition

Vulnerability summary

CVE-2025-7403 is a high (CVSS 7.6) Write-what-where Condition vulnerability in zephyrproject-rtos zephyr. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 10.2% of scored vulnerabilities.

Timeline

1. 19-09-2025
   PublishedVulnerability first disclosed.
2. 13-10-2026
   Last modifiedVulnerability information updated.

Description

Unsafe handling in bt_conn_tx_processor causes a use-after-free, resulting in a write-before-zero. The written 4 bytes are attacker-controlled, enabling precise memory corruption.

• CWE-123Write-what-where ConditionAny condition where the attacker has the ability to write an arbitrary value to an arbitrary location, often as the result of a buffer overflow.