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Fencer Vulns
medium 5.5

CVE-2026-53073 json

Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error

published 2026-06-24 4 mo ago modified 2026-11-06 3 d ago also EUVD-2026-38941

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error

When hci_register_dev() fails in hci_uart_register_dev() HCI_UART_PROTO_INIT is not cleared before calling hu->proto->close(hu) and setting hu->hdev to NULL. This means incoming UART data will reach the protocol-specific recv handler in hci_uart_tty_receive() after resources are freed.

Clear HCI_UART_PROTO_INIT with a write lock before calling hu->proto->close() and setting hu->hdev to NULL. The write lock ensures all active readers have completed and no new reader can enter the protocol recv path before resources are freed.

This allows the protocol-specific recv functions to remove the "HCI_UART_REGISTERED" guard without risking a null pointer dereference if hci_register_dev() fails.

Patch / fix

  • Linux Linux 5.5, 5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, 6.14, 6.15, 6.18.33, 7.0.10, 7.1
  • linux Debian 12 6.1.176-1
  • linux Debian 13 6.12.94-1
  • linux Debian 14 7.0.10-1

debian advisories DEBIAN-CVE-2026-53073

  • linux Ubuntu 22.04 LTS 5.15.0-186.196
  • linux Ubuntu 24.04 LTS 6.8.0-136.136
  • linux Ubuntu 26.04 LTS 7.0.0-28.28
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1112.119
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1061.64
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1009.9
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1112.122
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1064.72

ubuntu advisories UBUNTU-CVE-2026-53073

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 10.2 6.12.0-211.51.1.el10_2
  • rv RHEL 10.2 6.12.0-211.51.1.el10_2
  • perf RHEL 10.2 6.12.0-211.51.1.el10_2
  • rtla RHEL 10.2 6.12.0-211.51.1.el10_2
  • libperf RHEL 10.2 6.12.0-211.51.1.el10_2
  • kernel-rt RHEL 10.2 6.12.0-211.51.1.el10_2
  • kernel-64k RHEL 10.2 6.12.0-211.51.1.el10_2
  • kernel-core RHEL 10.2 6.12.0-211.51.1.el10_2

red hat advisories RHSA-2026:63128RHSA-2026:63129

  • kernel-source Linux Micro 6.1, Linux Micro 6.0 6.4.0-51.1
  • kernel-default Linux Micro 6.1, Linux Micro 6.0 6.4.0-51.1
  • kernel-kvmsmall Linux Micro 6.1, Linux Micro 6.0 6.4.0-51.1
  • kernel-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-51.1
  • kernel-source-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-51.1
  • kernel-default SLES 16.0, SLE High Availability Extension 16.0, Linux Micro 6.2 +1 more 6.12.0-160000.37.1
  • kernel-rt Linux Micro 6.2 6.12.0-160000.37.1
  • kernel-64kb SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.37.1

suse advisories SUSE-SU-2026:23244-1SUSE-SU-2026:23241-1SUSE-SU-2026:23194-1SUSE-SU-2026:23193-1SUSE-SU-2026:23237-1SUSE-SU-2026:23068-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.37.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.37.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.37.1

opensuse advisories openSUSE-SU-2026:21555-1

  • kernel AlmaLinux 10 6.12.0-211.51.1.el10_2
  • rv AlmaLinux 10 6.12.0-211.51.1.el10_2
  • perf AlmaLinux 10 6.12.0-211.51.1.el10_2
  • rtla AlmaLinux 10 6.12.0-211.51.1.el10_2
  • libperf AlmaLinux 10 6.12.0-211.51.1.el10_2
  • kernel-rt AlmaLinux 10 6.12.0-211.51.1.el10_2
  • kernel-64k AlmaLinux 10 6.12.0-211.51.1.el10_2
  • kernel-core AlmaLinux 10 6.12.0-211.51.1.el10_2

almalinux advisories ALSA-2026:63128ALSA-2026:63129

  • kernel Rocky Linux 10 6.12.0-211.51.1.el10_2
  • kernel Rocky Linux 9 5.14.0-687.44.1.el9_8

rocky linux advisories RLSA-2026:63128RLSA-2026:63129

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-53073 updated cvss 7.0

kernel: Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error

  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.154.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.154.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.154.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.154.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.154.1.el9_6
    fixed: vendor fix RHSA-2026:94438
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.44.1.el9_8, perf 5.14.0-687.44.1.el9_8, rtla 5.14.0-687.44.1.el9_8, python3-perf 5.14.0-687.44.1.el9_8, kernel-devel-matched 5.14.0-687.44.1.el9_8, kernel-64k-devel-matched 5.14.0-687.44.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:63129
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.51.1.el10_2, perf 6.12.0-211.51.1.el10_2, rtla 6.12.0-211.51.1.el10_2, python3-perf 6.12.0-211.51.1.el10_2, kernel-devel-matched 6.12.0-211.51.1.el10_2, kernel-64k-devel-matched 6.12.0-211.51.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:63128
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.202.1.el9_2, rtla 5.14.0-284.202.1.el9_2, kernel-devel-matched 5.14.0-284.202.1.el9_2, kernel-64k-devel-matched 5.14.0-284.202.1.el9_2, kernel-debug-devel-matched 5.14.0-284.202.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.202.1.el9_2, +5 more
    fixed: vendor fix RHSA-2026:94477
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) rv 5.14.0-427.161.1.el9_4, perf 5.14.0-427.161.1.el9_4, rtla 5.14.0-427.161.1.el9_4, kernel-devel-matched 5.14.0-427.161.1.el9_4, kernel-64k-devel-matched 5.14.0-427.161.1.el9_4, kernel-debug-devel-matched 5.14.0-427.161.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:94109
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.115.1.el10_0, perf 6.12.0-55.115.1.el10_0, rtla 6.12.0-55.115.1.el10_0, python3-perf 6.12.0-55.115.1.el10_0, kernel-devel-matched 6.12.0-55.115.1.el10_0, kernel-64k-devel-matched 6.12.0-55.115.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:92362
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.154.1.el9_6, perf 5.14.0-570.154.1.el9_6, rtla 5.14.0-570.154.1.el9_6, python3-perf 5.14.0-570.154.1.el9_6, kernel-devel-matched 5.14.0-570.154.1.el9_6, kernel-64k-devel-matched 5.14.0-570.154.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:94438
show 22 more
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.44.1.el9_8, kernel-64k 5.14.0-687.44.1.el9_8, kernel-core 5.14.0-687.44.1.el9_8, kernel-tools 5.14.0-687.44.1.el9_8, kernel-modules 5.14.0-687.44.1.el9_8, kernel-64k-core 5.14.0-687.44.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:63129
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.51.1.el10_2, kernel-64k 6.12.0-211.51.1.el10_2, kernel-core 6.12.0-211.51.1.el10_2, kernel-tools 6.12.0-211.51.1.el10_2, kernel-modules 6.12.0-211.51.1.el10_2, kernel-64k-core 6.12.0-211.51.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:63128
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.202.1.el9_2, kernel 5.14.0-284.202.1.el9_2, kernel-64k 5.14.0-284.202.1.el9_2, kernel-core 5.14.0-284.202.1.el9_2, kernel-tools 5.14.0-284.202.1.el9_2, python3-perf 5.14.0-284.202.1.el9_2, +28 more
    fixed: vendor fix RHSA-2026:94477
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool 7.3.0-427.161.1.el9_4, kernel 5.14.0-427.161.1.el9_4, kernel-64k 5.14.0-427.161.1.el9_4, kernel-core 5.14.0-427.161.1.el9_4, kernel-tools 5.14.0-427.161.1.el9_4, python3-perf 5.14.0-427.161.1.el9_4, +28 more
    fixed: vendor fix RHSA-2026:94109
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.115.1.el10_0, kernel-64k 6.12.0-55.115.1.el10_0, kernel-core 6.12.0-55.115.1.el10_0, kernel-tools 6.12.0-55.115.1.el10_0, kernel-modules 6.12.0-55.115.1.el10_0, kernel-64k-core 6.12.0-55.115.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:92362
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.154.1.el9_6, kernel-64k 5.14.0-570.154.1.el9_6, kernel-core 5.14.0-570.154.1.el9_6, kernel-tools 5.14.0-570.154.1.el9_6, kernel-modules 5.14.0-570.154.1.el9_6, kernel-64k-core 5.14.0-570.154.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:94438
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.44.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.44.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.44.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.44.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.44.1.el9_8
    fixed: vendor fix RHSA-2026:63129
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.51.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.51.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.51.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.51.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.51.1.el10_2
    fixed: vendor fix RHSA-2026:63128
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.115.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.115.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.115.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.115.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.115.1.el10_0
    fixed: vendor fix RHSA-2026:92362
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.44.1.el9_8, kernel-rt-64k 5.14.0-687.44.1.el9_8, kernel-rt-core 5.14.0-687.44.1.el9_8, kernel-rt-modules 5.14.0-687.44.1.el9_8, kernel-rt-64k-core 5.14.0-687.44.1.el9_8, kernel-rt-debug-core 5.14.0-687.44.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:63129
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.51.1.el10_2, kernel-rt-64k 6.12.0-211.51.1.el10_2, kernel-rt-core 6.12.0-211.51.1.el10_2, kernel-rt-modules 6.12.0-211.51.1.el10_2, kernel-rt-64k-core 6.12.0-211.51.1.el10_2, kernel-rt-debug-core 6.12.0-211.51.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:63128
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-core 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-modules 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-debug-core 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-modules-core 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-debug-modules 5.14.0-284.202.1.rt14.487.el9_2, +4 more
    fixed: vendor fix RHSA-2026:94558
  • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt 5.14.0-427.161.1.el9_4, kernel-rt-core 5.14.0-427.161.1.el9_4, kernel-rt-modules 5.14.0-427.161.1.el9_4, kernel-rt-debug-core 5.14.0-427.161.1.el9_4, kernel-rt-modules-core 5.14.0-427.161.1.el9_4, kernel-rt-debug-modules 5.14.0-427.161.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:94109
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.115.1.el10_0, kernel-rt-64k 6.12.0-55.115.1.el10_0, kernel-rt-core 6.12.0-55.115.1.el10_0, kernel-rt-modules 6.12.0-55.115.1.el10_0, kernel-rt-64k-core 6.12.0-55.115.1.el10_0, kernel-rt-debug-core 6.12.0-55.115.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:92362
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.154.1.el9_6, kernel-rt-64k 5.14.0-570.154.1.el9_6, kernel-rt-core 5.14.0-570.154.1.el9_6, kernel-rt-modules 5.14.0-570.154.1.el9_6, kernel-rt-64k-core 5.14.0-570.154.1.el9_6, kernel-rt-debug-core 5.14.0-570.154.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:94438
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.44.1.el9_8, kernel-rt-core 5.14.0-687.44.1.el9_8, kernel-rt-modules 5.14.0-687.44.1.el9_8, kernel-rt-debug-core 5.14.0-687.44.1.el9_8, kernel-rt-modules-core 5.14.0-687.44.1.el9_8, kernel-rt-debug-modules 5.14.0-687.44.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:63129
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.51.1.el10_2, kernel-rt-core 6.12.0-211.51.1.el10_2, kernel-rt-modules 6.12.0-211.51.1.el10_2, kernel-rt-debug-core 6.12.0-211.51.1.el10_2, kernel-rt-modules-core 6.12.0-211.51.1.el10_2, kernel-rt-debug-modules 6.12.0-211.51.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:63128
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-kvm 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-core 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-modules 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-debug-kvm 5.14.0-284.202.1.rt14.487.el9_2, kernel-rt-debug-core 5.14.0-284.202.1.rt14.487.el9_2, +6 more
    fixed: vendor fix RHSA-2026:94558
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt 5.14.0-427.161.1.el9_4, kernel-rt-kvm 5.14.0-427.161.1.el9_4, kernel-rt-core 5.14.0-427.161.1.el9_4, kernel-rt-modules 5.14.0-427.161.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.161.1.el9_4, kernel-rt-debug-core 5.14.0-427.161.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:94109
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.115.1.el10_0, kernel-rt-kvm 6.12.0-55.115.1.el10_0, kernel-rt-core 6.12.0-55.115.1.el10_0, kernel-rt-modules 6.12.0-55.115.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.115.1.el10_0, kernel-rt-debug-core 6.12.0-55.115.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:92362
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.154.1.el9_6, kernel-rt-kvm 5.14.0-570.154.1.el9_6, kernel-rt-core 5.14.0-570.154.1.el9_6, kernel-rt-modules 5.14.0-570.154.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.154.1.el9_6, kernel-rt-debug-core 5.14.0-570.154.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:94438
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3 d ago

Exploit prediction

0.11% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.