High 8.8Published Aug 15, 2026

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

Updated under an hour ago (Oct 27, 2026, 2:30 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 27c24fda62b601d6f9ca5e992502578c4310876f before 44590dc53c9e949d2fed399a571a89c3d7d0b245; from 27c24fda62b601d6f9ca5e992502578c4310876f before 99b65f0ea3370c13687ff870330c425b6ca44e89; 27c24fda62b601d6f9ca5e992502578c4310876f builds before 4e9b5e8669b3602a4e01b6d1e9539b72e42c84d5; from 27c24fda62b601d6f9ca5e992502578c4310876f before 1308d72903d792d10b82bc4ef08b8a4452308b04; 27c24fda62b601d6f9ca5e992502578c4310876f builds before 0d255e63fcf3f13a570d7ac11678fa1164ac015c	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.