High [CVE-2026-53072] fix locking in hci_conn_request_evt with HCI_PROTO_DEFER
This high-severity Red Hat Linux advisory covers CVE-2026-53072 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 6.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix locking in hci_conn_request_evt() with HCI_PROTO_DEFER When protocol sets HCI_PROTO_DEFER, hci_conn_request_evt() calls hci_connect_cfm(conn) without hdev->lock. Generally hci_connect_cfm() assumes it is held, and if conn is deleted concurrently -> UAF.
Only SCO and ISO set HCI_PROTO_DEFER and only for defer setup listen, and HCI_EV_CONN_REQUEST is not generated for ISO. In the non-deferred listening socket code paths, hci_connect_cfm(conn) is called with hdev->lock held.
Improper handling of locking within the `hci_conn_request_evt()` function, particularly when the `HCI_PROTO_DEFER` protocol is active, can result in a Use-After-Free (UAF) vulnerability.
This condition arises when a connection object is accessed after it has been deallocated, potentially allowing a local attacker to cause a system crash or execute arbitrary code. Red Hat severity: Moderate — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).
Weakness: CWE-364. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 8.
Will not fix / out of support: Red Hat Enterprise Linux 6. Red Hat fixing advisory: RHSA-2026:65334, RHSA-2026:67150.
Affected products named by the advisory: Red Hat package: kernel-rt.
Is CVE-2026-53072 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-53072 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-53072?
Upgrade to a fixed release named by Red Hat:
- kernel-0:6.12.0-211.53.1.el10_2
- kernel-0:5.14.0-687.47.1.el9_8
- RHSA-2026:65334
- RHSA-2026:67150
Confirm against the vendor advisory before you patch.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
- kernel-0:6.12.0-211.53.1.el10_2
- kernel-0:5.14.0-687.47.1.el9_8
- RHSA-2026:65334
- RHSA-2026:67150
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Mitigation
Upgrade to a fixed release: kernel-0:6.12.0-211.53.1.el10_2, kernel-0:5.14.0-687.47.1.el9_8, RHSA-2026:65334, RHSA-2026:67150. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Get an email when Red Hat Linux Kernel publishes the next one.
See Red Hat Linux Kernel's last 90 days of advisories first. Then choose one product with live alerts free for life, or a free month of real-time alerts on everything with the severity, the fixed version and the vendor's link (card needed, then US$15/month; we email you before the first charge).
More Red Hat Linux advisories
- CVE-2026-111497Oct 22, 2026Out-of-Bounds Write in Google Brotli Decoder
- CVE-2026-109619Oct 21, 2026fatal error handling retains stale request state leading to use-after-free
- CVE-2026-109618Oct 21, 2026OOM bailout during request parsing leads to memory corruption and RCE
- CVE-2026-119977Oct 31, 2026Arbitrary code execution via predictable upgrade staging paths
- CVE-2026-97229Oct 13, 2026integer overflow issue in CI/CD regular expression compiler
- CVE-2026-64849Aug 17, 2026Unauthenticated full-read SSRF in webhook delivery: _validate_webhook_url bypassed
iPhone and Android apps · New on the App Store
Monitor future Red Hat Linux CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.