What’s Vulnerable › Vulnerabilities

CVE-2023-53827: Bluetooth: L2CAP: Fix use-after-free in l2cap_disconnect_{req,rsp}

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-09 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix use-after-free in l2cap_disconnect_{req,rsp} Similar to commit d0be8347c623 ("Bluetooth: L2CAP: Fix use-after-free caused by l2cap_chan_put"), just use l2cap_chan_hold_unless_zero to prevent referencing a channel that is about to be destroyed.

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/1351551aa9058e07a20a27a158270cf84fcde621
• https://git.kernel.org/stable/c/348d446762e7c70778df8bafbdf3fa0df2123f58
• https://git.kernel.org/stable/c/a2a9339e1c9deb7e1e079e12e27a0265aea8421a
• https://git.kernel.org/stable/c/ac6725a634f7e8c0330610a8527f20c730b61115
• https://git.kernel.org/stable/c/c02421992505c95c7f3c9ad59ee35e22eac60988
• https://git.kernel.org/stable/c/d82a439c3cfdb28aa7e82e2e849c5c4dd9fca284
• https://git.kernel.org/stable/c/d9ba36c22a7bb09d6bac4cc2f243eff05da53f43
• https://git.kernel.org/stable/c/f2d38e77aa5f3effc143e7dd24da8acf02925958

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