CVE-2023-28464 — hci_conn_cleanup in net/bluetooth/hci_conn

hci_conn_cleanup in net/bluetooth/hci_conn.c in the Linux kernel through 6.2.9 has a use-after-free (observed in hci_conn_hash_flush) because of calls to hci_dev_put and hci_conn_put. There is a double free that may lead to privilege escalation.

01What is this vulnerability?

hci_conn_cleanup in net/bluetooth/hci_conn.c in the Linux kernel through 6.2.9 has a use-after-free (observed in hci_conn_hash_flush) because of calls to hci_dev_put and hci_conn_put. There is a double free that may lead to privilege escalation.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-03-31T00:00:00.000Z
• Last modified: 2024-08-02T12:38:25.326Z

09References

• lore.kernel.org — https://lore.kernel.org/lkml/20230309074645.74309-1-wzhmmmmm%40gmail.com/
• www.openwall.com — https://www.openwall.com/lists/oss-security/2023/03/28/2
• www.openwall.com — https://www.openwall.com/lists/oss-security/2023/03/28/3
• security.netapp.com — https://security.netapp.com/advisory/ntap-20230517-0004/