CVE-2023-53827

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

HIGH
8.8
CVSS Score
Published: December 9, 2025 at 01:29 AM UTC
Updated: October 15, 2026 at 10:17 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH8.8
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

3.561d6ef3e3408cdf7e622646fb90a9f7f9560b943
Vendor states this is fixed in 1351551aa9058e07a20a27a158270cf84fcde621 (fixed)
Vendor states this is fixed in 348d446762e7c70778df8bafbdf3fa0df2123f58 (fixed)
Vendor states this is fixed in a2a9339e1c9deb7e1e079e12e27a0265aea8421a (fixed)
Vendor states this is fixed in ac6725a634f7e8c0330610a8527f20c730b61115 (fixed)
Vendor states this is fixed in c02421992505c95c7f3c9ad59ee35e22eac60988 (fixed)
Vendor states this is fixed in d82a439c3cfdb28aa7e82e2e849c5c4dd9fca284 (fixed)
Vendor states this is fixed in d9ba36c22a7bb09d6bac4cc2f243eff05da53f43 (fixed)
Vendor states this is fixed in f2d38e77aa5f3effc143e7dd24da8acf02925958 (fixed)
Vendor states this is fixed in 3.5 (unaffected)
Vendor states this is fixed in 4.14.313 (unaffected)
Vendor states this is fixed in 4.19.281 (unaffected)
Vendor states this is fixed in 5.10.178 (unaffected)
Vendor states this is fixed in 5.15.108 (unaffected)
Vendor states this is fixed in 5.4.241 (unaffected)
Vendor states this is fixed in 6.1.25 (unaffected)
Vendor states this is fixed in 6.2.12 (unaffected)
Vendor states this is fixed in 6.3 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHLinux
Vector?

Quick Info

StatusDEFERRED

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