CVE-2025-7403 — Write-what-where Condition in Zephyr

CWE-123 — Write-what-where Condition2 documents2 sources
Severity
6.5MEDIUMNVD
CNA7.6
EPSS
0.0%
top 93.48%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Zephyrproject-rtos ZephyrZephyrproject Zephyr
Timeline
PublishedSep 19

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.

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 2.8 | Impact: 3.6

Affected Packages2 packages

▶CVEListV5zephyrproject-rtos/zephyr* — 4.1

Patches

Patch: github.com ↗

🔴Vulnerability Details

1
CVEList
Bluetooth: bt_conn_tx_processor unsafe handling↗2025-09-19
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CVE-2025-7403 — Write-what-where Condition in Zephyr | cvebase