CVE-2026-74537
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 versions
Linux kernel versions
5.15
and later are affected. Fixed in
6.18.44,
7.1.8,
7.2-rc6
and their respective stable series.
References
3 totalFrequently asked questions
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What is CVE-2026-74537?
CVE-2026-74537 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.15 onward and has been patched in 6.18.44, 7.1.8 and 7.2-rc6. CVE-2026-74537 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-74537?
Yes. CVE-2026-74537 has been patched. Fixed versions include 6.18.44, 7.1.8 and 7.2-rc6. If you are running Linux kernel 5.15 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-74537 actively exploited?
No. CVE-2026-74537 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.