What’s Vulnerable › Vulnerabilities

CVE-2024-56604: Bluetooth: RFCOMM: avoid leaving dangling sk pointer in rfcomm_sock_alloc()

• Severity: high (CVSS 7.8 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: 2024-12-27 · updated 2026-06-17
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: avoid leaving dangling sk pointer in rfcomm_sock_alloc() bt_sock_alloc() attaches allocated sk object to the provided sock object. If rfcomm_dlc_alloc() fails, we release the sk object, but leave the dangling pointer in the sock object, which may cause use-after-free. Fix this by swapping calls to bt_sock_alloc() and rfcomm_dlc_alloc().

Affected products

• Linux kernel: before 6.1.120; from 6.2 before 6.6.66; from 6.7 before 6.12.5 — fixed in 6.1.120, 6.12.5, 6.6.66

How to fix

Upgrade to a fixed version: Linux kernel 6.1.120, 6.12.5, 6.6.66. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/32df687e129ef0f9afcbcc914f7c32deb28fd481
• https://git.kernel.org/stable/c/3945c799f12b8d1f49a3b48369ca494d981ac465
• https://git.kernel.org/stable/c/6021ccc2471b7b95e29b7cfc7938e042bf56e281
• https://git.kernel.org/stable/c/ac3eaac4cf142a15fe67be747a682b1416efeb6e
• https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html

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