CVE-2026-89774
Bluetooth: SCO: hold sk properly in sco_conn_ready
Reported by linux · Published September 16, 2026
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.
EPSS 0.40% · 34.7th percentile
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| Linux | Linux | d141d9b769bcd1b747898528c5023270cda040f2, 73cb063f5ec6ca51eb1e246c6d332563002ac277, 7199c78c3a3e399a4dc439d845826793880ccedc, 6e3840578aaad1a296aab1eaaa89ea3b7d5cbae1, 50aae396dc30377bec8e3b181b8346f8fd38f7d8, 4e37f6452d586b95c346a9abdd2fb80b67794f39 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | 27c24fda62b601d6f9ca5e992502578c4310876f, 27c24fda62b601d6f9ca5e992502578c4310876f, 27c24fda62b601d6f9ca5e992502578c4310876f |
| Linux | Linux | 5.15, 0, 5.15.212 |
| Linux | Linux | 7.1, 0, 5.15.212 |
| linux | linux_kernel | 5.15, 5.15, 5.15 |
Timeline
- Sep 16, 2026 EPSS Score (19 in total, the first dated here)
- Sep 16, 2026 CVE Published
- Sep 16, 2026 CVE Updated
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