CVE-2026-89774Bluetooth: SCO: hold sk properly in sco_conn_ready
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SCO: hold sk properly in sco_conn_ready sk deref in sco_conn_ready must be done either under conn->lock, or holding a refcount, to avoid concurrent close. conn->sk and parent sk is currently accessed without either, and without checking parent->sk_state: [Task 1] [Task 2] sco_sock_release sco_conn_ready sk = conn->sk lock_sock(sk) conn->sk = NULL lock_sock(sk) release_sock(sk) sco_sock_kill(sk) UAF on sk deref and similarly for access to sco_get_sock_listen() return value. Fix possible UAF by holding sk refcount in sco_conn_ready() and making sco_get_sock_listen() increase refcount. Also recheck after lock_sock that the socket is still valid. Adjust conn->sk locking so it's protected also by lock_sock() of the associated socket if any.
- 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
- Sep 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 27c24fda62b601d6f9ca5e992502578c4310876f before 50aae396dc30377bec8e3b181b8346f8fd38f7d8; 27c24fda62b601d6f9ca5e992502578c4310876f builds before 6e3840578aaad1a296aab1eaaa89ea3b7d5cbae1; from 27c24fda62b601d6f9ca5e992502578c4310876f before d141d9b769bcd1b747898528c5023270cda040f2; from 27c24fda62b601d6f9ca5e992502578c4310876f before 73cb063f5ec6ca51eb1e246c6d332563002ac277; from 27c24fda62b601d6f9ca5e992502578c4310876f before 7199c78c3a3e399a4dc439d845826793880ccedc; 27c24fda62b601d6f9ca5e992502578c4310876f builds before 4e37f6452d586b95c346a9abdd2fb80b67794f39 | CNA record |
References
- https://git.kernel.org/stable/c/50aae396dc30377bec8e3b181b8346f8fd38f7d8
- https://git.kernel.org/stable/c/6e3840578aaad1a296aab1eaaa89ea3b7d5cbae1
- https://git.kernel.org/stable/c/d141d9b769bcd1b747898528c5023270cda040f2
- https://git.kernel.org/stable/c/73cb063f5ec6ca51eb1e246c6d332563002ac277
- https://git.kernel.org/stable/c/7199c78c3a3e399a4dc439d845826793880ccedc
- https://git.kernel.org/stable/c/4e37f6452d586b95c346a9abdd2fb80b67794f39
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.