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CVE-2026-43019

Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync

HIGH
7.8
CVSS Score
Published: May 1, 2026 at 02:15 PM UTC
Updated: October 19, 2026 at 08:18 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.8
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync hci_conn lookup and field access must be covered by hdev lock in set_cig_params_sync, otherwise it's possible it is freed concurrently. Take hdev lock to prevent hci_conn from being deleted or modified concurrently. Just RCU lock is not suitable here, as we also want to avoid "tearing" in the configuration.

Affected

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

Linux Kernel· Linux
95%
6.13 ≤ v < 6.18.226.19 ≤ v < 6.19.126.6 ≤ v < 6.12.813a273cd0f47dd672d37736e623849374f9ab9ce96.4.166.5.37.07.0 rc17.0 rc27.0 rc37.0 rc47.0 rc57.0 rc6a091289218202bc09d9b9caa8afcde1018584aecd8570c4c3f2a3e51b3c8b5e6ec898364c5c03062
Vendor states this is fixed in 66d432e9b45bae7881ffcdb12cd8fd0bf254ef02 (fixed)
Vendor states this is fixed in 7502c1cf303b69f71d085f5ff7251b0e1b0f09df (fixed)
Vendor states this is fixed in 7d568fede8eac91161a60b710aa920abe9b0fb9f (fixed)
Vendor states this is fixed in a2639a7f0f5bf7d73f337f8f077c19415c62ed2c (fixed)
Vendor states this is fixed in bad65b4b0a96139f023eadc28a33125963208449 (fixed)
Vendor states this is fixed in 6.12.81 (unaffected)
Vendor states this is fixed in 6.18.22 (unaffected)
Vendor states this is fixed in 6.19.12 (unaffected)
Affected range stops below 6.5, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 6.6 (unaffected)
Vendor states this is fixed in 6.6.143 (unaffected)
Vendor states this is fixed in 7.0 (unaffected)

References (5)

Patch
Source: cverecord
https://git.kernel.org/stable/c/66d432e9b45bae7881ffcdb12cd8fd0bf254ef02
Patch
Source: cverecord
https://git.kernel.org/stable/c/7d568fede8eac91161a60b710aa920abe9b0fb9f
Patch
Source: cverecord
https://git.kernel.org/stable/c/bad65b4b0a96139f023eadc28a33125963208449
Patch
Source: cverecord
https://git.kernel.org/stable/c/a2639a7f0f5bf7d73f337f8f077c19415c62ed2c
Source: cverecord
https://git.kernel.org/stable/c/7502c1cf303b69f71d085f5ff7251b0e1b0f09df

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

7.8HIGHLinux
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-416CWE-362

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