What’s Vulnerable › Vulnerabilities

CVE-2024-56605: Bluetooth: L2CAP: do not leave dangling sk pointer on error in l2cap_sock_create()

• 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: L2CAP: do not leave dangling sk pointer on error in l2cap_sock_create() bt_sock_alloc() allocates the sk object and attaches it to the provided sock object. On error l2cap_sock_alloc() frees the sk object, but the dangling pointer is still attached to the sock object, which may create use-after-free in other code.

Affected products

• Linux kernel: before 5.4.287; from 5.5 before 5.10.231; from 5.11 before 5.15.174; from 5.16 before 6.1.120; from 6.2 before 6.6.66; from 6.7 before 6.12.5 — fixed in 5.10.231, 5.15.174, 5.4.287, 6.1.120, 6.12.5, 6.6.66

How to fix

Upgrade to a fixed version: Linux kernel 5.10.231, 5.15.174, 5.4.287, 6.1.120. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/61686abc2f3c2c67822aa23ce6f160467ec83d35
• https://git.kernel.org/stable/c/7c4f78cdb8e7501e9f92d291a7d956591bf73be9
• https://git.kernel.org/stable/c/8ad09ddc63ace3950ac43db6fbfe25b40f589dd6
• https://git.kernel.org/stable/c/a8677028dd5123e5e525b8195483994d87123de4
• https://git.kernel.org/stable/c/bb2f2342a6ddf7c04f9aefbbfe86104cd138e629
• https://git.kernel.org/stable/c/daa13175a6dea312a76099066cb4cbd4fc959a84
• https://git.kernel.org/stable/c/f6ad641646b67f29c7578dcd6c25813c7dcbf51e
• https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
• https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

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