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High · 8.8 CVE-2026-74537 EUVD-2026-59730GHSA-4f56-g5vg-w2cg

Bluetooth: ISO: hold sk properly in iso_conn_ready

Published Aug 15, 2026 · Updated Oct 30, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: linux Package: linux Package: linux-6.12 Package: linux-allwinner-5.19 Package: linux-aws Package: linux-aws-5.0 Package: linux-aws-5.11 Package: linux-aws-5.13 Package: linux-aws-5.15 Package: linux-aws-5.19 Package: linux-aws-5.3 Package: linux-aws-5.8 Package: linux-aws-6.14 Package: linux-aws-6.17 Package: linux-aws-6.2 Package: linux-aws-6.5 Package: linux-aws-6.8 Package: linux-aws-7.0 Package: linux-aws-fips Package: linux-azure Package: linux-azure-5.11 Package: linux-azure-5.13 Package: linux-azure-5.15 Package: linux-azure-5.19 Package: linux-azure-5.3 Package: linux-azure-5.8 Package: linux-azure-6.11 Package: linux-azure-6.14 Package: linux-azure-6.17 Package: linux-azure-6.2 Package: linux-azure-6.5 Package: linux-azure-6.8 Package: linux-azure-7.0 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.15 Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.14 Package: linux-azure-fde-6.17 Package: linux-azure-fde-6.2 Package: linux-azure-fde-6.8 Package: linux-azure-fde-7.0 Package: linux-azure-fips Package: linux-azure-nvidia Package: linux-azure-nvidia-6.14 Package: linux-bluefield Package: linux-fips Package: linux-gcp Package: linux-gcp-5.11 Package: linux-gcp-5.13 Package: linux-gcp-5.15 Package: linux-gcp-5.19 Package: linux-gcp-5.3 Package: linux-gcp-5.8 Package: linux-gcp-6.11 Package: linux-gcp-6.14 Package: linux-gcp-6.17 Package: linux-gcp-6.2 Package: linux-gcp-6.5 Package: linux-gcp-6.8 Package: linux-gcp-7.0 Package: linux-gcp-fips Package: linux-gke Package: linux-gke-4.15 Package: linux-gke-5.15 Package: linux-gke-5.4 Package: linux-gkeop Package: linux-gkeop-5.15 Package: linux-gkeop-5.4 Package: linux-hwe Package: linux-hwe-5.11 Package: linux-hwe-5.13 Package: linux-hwe-5.15 Package: linux-hwe-5.19 Package: linux-hwe-5.8 Package: linux-hwe-6.11 Package: linux-hwe-6.14 Package: linux-hwe-6.17 Package: linux-hwe-6.2 Package: linux-hwe-6.5 Package: linux-hwe-6.8 Package: linux-hwe-7.0 Package: linux-hwe-edge Package: linux-ibm Package: linux-ibm-5.15 Package: linux-ibm-6.8 Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-intel-iotg Package: linux-intel-iotg-5.15 Package: linux-kvm Package: linux-lowlatency Package: linux-lowlatency-hwe-5.15 Package: linux-lowlatency-hwe-5.19 Package: linux-lowlatency-hwe-6.11 Package: linux-lowlatency-hwe-6.2 Package: linux-lowlatency-hwe-6.5 Package: linux-lowlatency-hwe-6.8 Package: linux-nvidia Package: linux-nvidia-6.11 Package: linux-nvidia-6.17 Package: linux-nvidia-6.2 Package: linux-nvidia-6.5 Package: linux-nvidia-6.8 Package: linux-nvidia-7.0 Package: linux-nvidia-bos Package: linux-nvidia-lowlatency Package: linux-nvidia-tegra Package: linux-nvidia-tegra-5.15 Package: linux-nvidia-tegra-igx Package: linux-oem Package: linux-oem-5.10 Package: linux-oem-5.13 Package: linux-oem-5.14 Package: linux-oem-5.17 Package: linux-oem-5.6 Package: linux-oem-6.0 Package: linux-oem-6.1 Package: linux-oem-6.11 Package: linux-oem-6.14 Package: linux-oem-6.17 Package: linux-oem-6.5 Package: linux-oem-6.8 Package: linux-oem-7.0 Package: linux-oracle Package: linux-oracle-5.0 Package: linux-oracle-5.11 Package: linux-oracle-5.13 Package: linux-oracle-5.15 Package: linux-oracle-5.3 Package: linux-oracle-5.8 Package: linux-oracle-6.14 Package: linux-oracle-6.17 Package: linux-oracle-6.5 Package: linux-oracle-6.8 Package: linux-oracle-7.0 Package: linux-raspi Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime Package: linux-realtime-6.14 Package: linux-realtime-6.17 Package: linux-realtime-6.8 Package: linux-riscv Package: linux-riscv-5.11 Package: linux-riscv-5.15 Package: linux-riscv-5.19 Package: linux-riscv-5.8 Package: linux-riscv-6.14 Package: linux-riscv-6.17 Package: linux-riscv-6.5 Package: linux-riscv-6.8 Package: linux-riscv-7.0 Package: linux-starfive-5.19 Package: linux-starfive-6.2 Package: linux-starfive-6.5 Package: linux-vmware Package: linux-xilinx Package: linux-xilinx-zynqmp Platform: Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

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

Bluetooth: ISO: hold sk properly in iso_conn_ready

sk deref in iso_conn_ready must be done either under conn->lock, or
holding a refcount, to avoid concurrent close. conn->sk is currently
accessed without either:

[Task 1] [Task 2]
iso_sock_release
iso_conn_ready
sk = conn->sk
lock_sock(sk)
conn->sk = NULL
lock_sock(sk)
release_sock(sk)
iso_sock_kill(sk)
UAF on sk deref

Fix possible UAF by holding sk refcount in iso_conn_ready(). Also
recheck after lock_sock that the socket is still valid. Adjust locking
so conn->sk is cleared only under lock_sock.

Affected products

VendorProductAffectedFixed
Linux Linux 5.15 6.1.191

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 linux 7.1.8-1 —
Debian 13 linux 6.12.115-2 —
Debian 12 linux No fix yet —
Debian 12 linux-6.12 6.12.115-2~deb12u1 —

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu Nvidia-BlueField 24.04 LTS linux-bluefield No fix yet —
Ubuntu Nvidia-BlueField 22.04 LTS linux-bluefield No fix yet —
Ubuntu 26.04 LTS linux 7.0.0-42.42 USN-8959-1
Ubuntu 26.04 LTS linux-aws 7.0.0-1016.17 USN-8959-1
Ubuntu 26.04 LTS linux-azure 7.0.0-1020.21 USN-9019-1
Ubuntu 26.04 LTS linux-azure-fde 7.0.0-1019.19 USN-9020-1
Ubuntu 26.04 LTS linux-gcp 7.0.0-1016.18 USN-8959-1
Ubuntu 26.04 LTS linux-gke 7.0.0-1010.11 USN-9020-1
Ubuntu 26.04 LTS linux-ibm +1 7.0.0-1017.17 USN-8960-1, USN-8959-1
Ubuntu 26.04 LTS linux-nvidia +1 No fix yet —
Ubuntu 26.04 LTS linux-oracle 7.0.0-1015.16 USN-8959-1
Ubuntu 26.04 LTS linux-raspi 7.0.0-1023.23 USN-9021-1
Ubuntu 26.04 LTS linux-realtime 7.0.0-43.43.1 USN-9020-1
Ubuntu 26.04 LTS linux-riscv 7.0.0-42.42.1 —
Ubuntu 24.04 LTS linux +45 No fix yet —
Ubuntu 24.04 LTS linux-aws-7.0 7.0.0-1017.18~24.04.1 USN-9020-1
Ubuntu 24.04 LTS linux-azure-fde-7.0 7.0.0-1019.19~24.04.1 USN-9020-1
Ubuntu 24.04 LTS linux-gcp-7.0 7.0.0-1017.19~24.04.1 USN-9020-1
Ubuntu 24.04 LTS linux-hwe-7.0 7.0.0-42.42~24.04.1 USN-8959-1
Ubuntu 24.04 LTS linux-nvidia-tegra 6.8.0-1036.39 USN-8886-1
Ubuntu 24.04 LTS linux-oracle-7.0 7.0.0-1016.18~24.04.1 USN-9020-1
Ubuntu 24.04 LTS linux-riscv-7.0 7.0.0-42.42.1~24.04.1 —
Ubuntu 22.04 LTS linux +59 No fix yet —
Show 9 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 20.04 LTS linux-gke +28 No fix yet —
Ubuntu 18.04 LTS linux-gcp +14 No fix yet —
Ubuntu 16.04 LTS linux-hwe-edge No fix yet —
Ubuntu Pro Realtime 24.04 LTS linux-realtime +3 No fix yet —
Ubuntu Pro Realtime 22.04 LTS linux-realtime +2 No fix yet —
Ubuntu Pro FIPS-updates 24.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 22.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-preview 22.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro 20.04 LTS linux-aws-5.15 +10 No fix yet —

SUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
SLES 15 SP7 kernel-64kb +7 6.4.0-150700.53.81.1 SUSE-SU-2026:4254-1
SLES 15 SP7 kernel-default-base 6.4.0-150700.53.81.1.150700.17.45.1 SUSE-SU-2026:4254-1
SLES 15 SP6 kernel-64kb +6 6.4.0-150600.23.135.1 SUSE-SU-2026:4369-1
SLES 15 SP6 kernel-default-base 6.4.0-150600.23.135.1.150600.12.62.4 SUSE-SU-2026:4369-1
SLES 15 SP5 kernel-64kb +6 5.14.21-150500.55.189.1 SUSE-SU-2026:4595-1
SLES 15 SP5 kernel-default-base 5.14.21-150500.55.189.1.150500.6.87.4 SUSE-SU-2026:4595-1
SLES 15 SP4 kernel-64kb +2 5.14.21-150400.24.240.2 SUSE-SU-2026:4284-1
SLES 15 SP4 kernel-default-base 5.14.21-150400.24.240.2.150400.24.120.2 SUSE-SU-2026:4284-1
SLES 15 SP4 kernel-docs +3 5.14.21-150400.24.240.1 SUSE-SU-2026:4284-1
SLES 12 SP5 kernel-syms +2 4.12.14-122.328.1 SUSE-SU-2026:4282-1
Show 19 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLES for SAP 16.0 kernel-64kb +8 6.12.0-160000.38.1 SUSE-SU-2026:23902-1
SLES for SAP 16.0 kernel-default-base 6.12.0-160000.38.1.160000.2.23 SUSE-SU-2026:23902-1
SLES for SAP 15 SP6 kernel-default-base 6.4.0-150600.23.135.1.150600.12.62.4 SUSE-SU-2026:4369-1
SLES for SAP 15 SP6 kernel-docs +4 6.4.0-150600.23.135.1 SUSE-SU-2026:4369-1
SLES for SAP 15 SP5 kernel-default-base 5.14.21-150500.55.189.1.150500.6.87.4 SUSE-SU-2026:4595-1
SLES for SAP 15 SP5 kernel-docs +4 5.14.21-150500.55.189.1 SUSE-SU-2026:4595-1
SLES for SAP 15 SP4 kernel-default 5.14.21-150400.24.240.2 SUSE-SU-2026:4284-1
SLES for SAP 15 SP4 kernel-default-base 5.14.21-150400.24.240.2.150400.24.120.2 SUSE-SU-2026:4284-1
SLES for SAP 15 SP4 kernel-docs +3 5.14.21-150400.24.240.1 SUSE-SU-2026:4284-1
SLES 16.0 kernel-64kb +8 6.12.0-160000.38.1 SUSE-SU-2026:23902-1, SUSE-SU-2026:23897-1
SLES 16.0 kernel-default-base 6.12.0-160000.38.1.160000.2.23 SUSE-SU-2026:23902-1
SLE Micro 6.2 kernel-default-base 6.12.0-160000.38.1.160000.2.23 SUSE-SU-2026:23887-1
SLE Micro 6.2 kernel-rt +5 6.12.0-160000.38.1 SUSE-SU-2026:23887-1, SUSE-SU-2026:23881-1
SLE Micro 6.1 kernel-default-base 6.4.0-52.1.21.34 SUSE-SU-2026:23529-1
SLE Micro 6.1 kernel-rt +4 6.4.0-52.1 SUSE-SU-2026:23529-1, SUSE-SU-2026:23528-1
SLE Micro 6.0 kernel-default-base 6.4.0-52.1.21.36 SUSE-SU-2026:23481-1
SLE Micro 6.0 kernel-rt +4 6.4.0-52.1 SUSE-SU-2026:23481-1, SUSE-SU-2026:23477-1
SLE Micro 5.5 kernel-default-base 5.14.21-150500.55.189.1.150500.6.87.4 SUSE-SU-2026:4595-1
SLE Micro 5.5 kernel-rt +1 5.14.21-150500.13.161.1 SUSE-SU-2026:4347-1
SLE Micro 5.5 kernel-source +1 5.14.21-150500.55.189.1 SUSE-SU-2026:4595-1
SLE Micro 5.4 kernel-default 5.14.21-150400.24.240.2 SUSE-SU-2026:4284-1
SLE Micro 5.4 kernel-default-base 5.14.21-150400.24.240.2.150400.24.120.2 SUSE-SU-2026:4284-1
SLE Micro 5.4 kernel-rt +1 5.14.21-150400.15.186.1 SUSE-SU-2026:4279-1
SLE Micro 5.4 kernel-source 5.14.21-150400.24.240.1 SUSE-SU-2026:4284-1
SLE Micro 5.3 kernel-default 5.14.21-150400.24.240.2 SUSE-SU-2026:4284-1
SLE Micro 5.3 kernel-default-base 5.14.21-150400.24.240.2.150400.24.120.2 SUSE-SU-2026:4284-1
SLE Micro 5.3 kernel-rt +1 5.14.21-150400.15.186.1 SUSE-SU-2026:4279-1
SLE Micro 5.3 kernel-source 5.14.21-150400.24.240.1 SUSE-SU-2026:4284-1
SLE Live Patching 15 SP7 kernel-default 6.4.0-150700.53.81.1 SUSE-SU-2026:4254-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7-RT_Update_20 1-150700.1.3.1 SUSE-SU-2026:4120-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7_Update_21 1-150700.15.3.1 SUSE-SU-2026:4254-1
SLE Live Patching 15 SP6 kernel-default 6.4.0-150600.23.135.1 SUSE-SU-2026:4369-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_31 1-150600.13.3.4 SUSE-SU-2026:4369-1
SLE Live Patching 15 SP5 kernel-default 5.14.21-150500.55.189.1 SUSE-SU-2026:4595-1
SLE Live Patching 15 SP5 kernel-livepatch-SLE15-SP5_Update_45 1-150500.11.5.3 SUSE-SU-2026:4595-1
SLE Live Patching 15 SP4 kernel-default 5.14.21-150400.24.240.2 SUSE-SU-2026:4284-1
SLE Live Patching 15 SP4 kernel-livepatch-SLE15-SP4_Update_59 1-150400.9.5.1 SUSE-SU-2026:4284-1
SLE Live Patching 12 SP5 kernel-default 4.12.14-122.328.1 SUSE-SU-2026:4282-1
SLE Live Patching 12 SP5 kgraft-patch-SLE12-SP5_Update_87 1-8.5.1 SUSE-SU-2026:4282-1
SLE HPC 15 SP5 kernel-64kb +5 5.14.21-150500.55.189.1 SUSE-SU-2026:4595-1
SLE HPC 15 SP5 kernel-default-base 5.14.21-150500.55.189.1.150500.6.87.4 SUSE-SU-2026:4595-1
SLE HPC 15 SP4 kernel-64kb +1 5.14.21-150400.24.240.2 SUSE-SU-2026:4284-1
SLE HPC 15 SP4 kernel-default-base 5.14.21-150400.24.240.2.150400.24.120.2 SUSE-SU-2026:4284-1
SLE HPC 15 SP4 kernel-docs +3 5.14.21-150400.24.240.1 SUSE-SU-2026:4284-1
SUSE Real Time Module 15 SP7 kernel-rt +2 6.4.0-150700.7.75.1 SUSE-SU-2026:4120-1

openSUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
openSUSE Leap 16.0 kernel-default-base 6.12.0-160000.38.1.160000.2.22 openSUSE-SU-2026:21910-1
openSUSE Leap 16.0 kernel-rt +11 6.12.0-160000.38.1 openSUSE-SU-2026:21910-1

Advisories 24

References