What’s Vulnerable › Vulnerabilities

CVE-2026-74537: Bluetooth: ISO: hold sk properly in iso_conn_ready

• 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: 2026-08-15 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: hold sk properly in iso_conn_ready sk deref in iso_conn_ready must be done either under conn->lock, or holding a refcount, to avoid concurrent close. conn->sk is currently accessed without either: [Task 1] [Task 2] iso_sock_release iso_conn_ready sk = conn->sk lock_sock(sk) conn->sk = NULL lock_sock(sk) release_sock(sk) iso_sock_kill(sk) UAF on sk deref Fix possible UAF by holding sk refcount in iso_conn_ready(). Also recheck after lock_sock that the socket is still valid. Adjust locking so conn->sk is cleared only under lock_sock.

Affected products

• Linux: 5.15 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0d255e63fcf3f13a570d7ac11678fa1164ac015c
• https://git.kernel.org/stable/c/1308d72903d792d10b82bc4ef08b8a4452308b04
• https://git.kernel.org/stable/c/44590dc53c9e949d2fed399a571a89c3d7d0b245
• https://git.kernel.org/stable/c/4e9b5e8669b3602a4e01b6d1e9539b72e42c84d5
• https://git.kernel.org/stable/c/622180fe44fb52d4d7bafcd67922959823fec263
• https://git.kernel.org/stable/c/99b65f0ea3370c13687ff870330c425b6ca44e89

Get alerted when CVE-2026-74537 or the next vulnerability affects your stack