CVE-2026-89774
Bluetooth: SCO: hold sk properly in sco_conn_ready
At a glance
- Source
- NVD
- EPSS
- EPSS 0.40 % · percentile 34 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Received
Description
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.
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
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | Linux |
| CVSS 3.1 | HIGH 8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-80255
- GCVE · GCVE-0-2026-89774
CERT-FR advisories
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1333 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1286 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 27c24fda62b601d6f9ca5e992502578c4310876f < 50aae396dc30377bec8e3b181b8346f8fd38f7d8 ; affected 27c24fda62b601d6f9ca5e992502578c4310876f < 6e3840578aaad1a296aab1eaaa89ea3b7d5cbae1 ; affected 27c24fda62b601d6f9ca5e992502578c4310876f < d141d9b769bcd1b747898528c5023270cda040f2 ; affected 27c24fda62b601d6f9ca5e992502578c4310876f < 73cb063f5ec6ca51eb1e246c6d332563002ac277 ; affected 27c24fda62b601d6f9ca5e992502578c4310876f < 7199c78c3a3e399a4dc439d845826793880ccedc ; affected 27c24fda62b601d6f9ca5e992502578c4310876f < 4e37f6452d586b95c346a9abdd2fb80b67794f39 |
| Linux · Linux | affected 5.15 ; unaffected 0 < 5.15 ; unaffected 5.15.212 ≤ 5.15.* ; unaffected 6.1.178 ≤ 6.1.* ; unaffected 6.6.145 ≤ 6.6.* ; unaffected 6.12.97 ≤ 6.12.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |