What’s Vulnerable › Vulnerabilities

CVE-2023-54214: Bluetooth: L2CAP: Fix potential user-after-free

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-30 · updated 2026-10-28

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix potential user-after-free This fixes all instances of which requires to allocate a buffer calling alloc_skb which may release the chan lock and reacquire later which makes it possible that the chan is disconnected in the meantime.

Affected products

• Linux kernel: 3.5 — fixed in 6.3

How to fix

Upgrade to a fixed version: Linux kernel 6.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/31a288a4df7f6a28e65da22a4ab2add4a963738e
• https://git.kernel.org/stable/c/60aaccf16d1e099c16bebfb96428ae762cb528f7
• https://git.kernel.org/stable/c/64e28ecf44e46de9f01915a4146706a21c3469d2
• https://git.kernel.org/stable/c/994e3e18908f5c4a12d07b44018e6aa85f071048
• https://git.kernel.org/stable/c/a6a7d1541fefddf7ca0cfb34c1bff63ff809cc49
• https://git.kernel.org/stable/c/b2fde8cb2a25125111f2144604e0e7c0ebcc4bba
• https://git.kernel.org/stable/c/b8ed41cc04fb74005aa51d17865ca3d022760335
• https://git.kernel.org/stable/c/df5703348813235874d851934e957c3723d71644

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