What’s Vulnerable › Vulnerabilities

CVE-2025-21936: Bluetooth: Add check for mgmt_alloc_skb() in mgmt_device_connected()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-01 · updated 2026-06-17
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: Add check for mgmt_alloc_skb() in mgmt_device_connected() Add check for the return value of mgmt_alloc_skb() in mgmt_device_connected() to prevent null pointer dereference.

Affected products

• Linux kernel: from 5.17 before 6.1.131; from 6.2 before 6.6.83; from 6.7 before 6.12.19; from 6.13 before 6.13.7; 6.14-rc1, 6.14-rc2, 6.14-rc3, 6.14-rc4, 6.14-rc5 — fixed in 6.1.131, 6.12.19, 6.13.7, 6.6.83

How to fix

Upgrade to a fixed version: Linux kernel 6.1.131, 6.12.19, 6.13.7, 6.6.83. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/7841180342c9a0fd97d54f3e62c7369309b5cd84
• https://git.kernel.org/stable/c/7d39387886ffe220323cbed5c155233c3276926b
• https://git.kernel.org/stable/c/bdb1805c248e9694dbb3ffa8867cef2e52cf7261
• https://git.kernel.org/stable/c/d8df010f72b8a32aaea393e36121738bb53ed905
• https://git.kernel.org/stable/c/dc516e66fb28c61b248b393e2ddd63bd7f104969
• https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html

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