Bluetooth: ISO: hold sk properly in iso_conn_ready
CVE-2026-74537 · published 15 Aug 2026
How serious is it
- Severity: high, CVSS score 8.8 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-74537?
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Who is affected
- Linux Linux: 27c24fda62b601d6f9ca5e992502578c4310876f to < 44590dc53c9e949d2fed399a571a89c3d7d0b245, 27c24fda62b601d6f9ca5e992502578c4310876f to < 99b65f0ea3370c13687ff870330c425b6ca44e89, 27c24fda62b601d6f9ca5e992502578c4310876f to < 4e9b5e8669b3602a4e01b6d1e9539b72e42c84d5, 27c24fda62b601d6f9ca5e992502578c4310876f to < 1308d72903d792d10b82bc4ef08b8a4452308b04
- Linux Linux: 5.15
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/44590dc53c9e949d2fed399a571a89c3d7d0b245
- git.kernel.org/stable/c/99b65f0ea3370c13687ff870330c425b6ca44e89
- git.kernel.org/stable/c/4e9b5e8669b3602a4e01b6d1e9539b72e42c84d5
- git.kernel.org/stable/c/1308d72903d792d10b82bc4ef08b8a4452308b04
- git.kernel.org/stable/c/0d255e63fcf3f13a570d7ac11678fa1164ac015c
Merged from CVE List. Last updated 25 Oct 2026. All vulnerabilities · RSS · JSON