NULL pointer dereference in Linux kernel - CVE-2026-80819

Vulnerability identifier: #VU147101

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-80819

CWE-ID: CWE-476

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper synchronization in the RFCOMM deferred setup acceptance path when processing a recvmsg call after a remote DISC frame is received for a deferred data link connection. A remote attacker can send a DISC frame to a deferred RFCOMM data link connection to cause a denial of service.

Linux kernel
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Micro Extras
SUSE Linux Micro
SUSE Linux Enterprise Live Patching
Ubuntu
linux (Ubuntu package)
linux-kvm (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-azure (Ubuntu package)
linux-raspi (Ubuntu package)
linux-oracle (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-gke (Ubuntu package)
linux-aws-5.15 (Ubuntu package)
linux-lowlatency-hwe-5.15 (Ubuntu package)
linux-hwe-5.15 (Ubuntu package)
linux-fips (Ubuntu package)
linux-azure-5.15 (Ubuntu package)
linux-azure-fde-5.15 (Ubuntu package)
linux-nvidia-tegra-igx (Ubuntu package)
linux-realtime (Ubuntu package)
linux-intel-iotg (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-gkeop (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-ibm-5.15 (Ubuntu package)
linux-ibm (Ubuntu package)
linux-intel-iotg-5.15 (Ubuntu package)
linux-oracle-5.15 (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-intel-iot-realtime (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-lowlatency-hwe-6.8 (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-azure-6.8 (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-oracle-6.8 (Ubuntu package)
linux-nvidia-lowlatency (Ubuntu package)
linux-vmware (Ubuntu package)
linux-ibm-6.8 (Ubuntu package)
linux-gcp-6.8 (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-realtime-6.8 (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oracle-7.0 (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-azure-fde-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-aws-7.0 (Ubuntu package)
kgraft-patch-4_12_14-122_328-default
kernel-default-debugsource
kernel-default
kernel-default-man
kernel-macros
kernel-devel
kernel-source
kernel-default-devel-debuginfo
kernel-default-base
kernel-default-devel
cluster-md-kmp-default
gfs2-kmp-default
ocfs2-kmp-default-debuginfo
gfs2-kmp-default-debuginfo
dlm-kmp-default
ocfs2-kmp-default
kernel-default-base-debuginfo
dlm-kmp-default-debuginfo
cluster-md-kmp-default-debuginfo
kernel-syms
kernel-default-kgraft
kernel-default-debuginfo
kernel-default-kgraft-devel
kernel-64kb
kernel-64kb-debugsource
kernel-64kb-devel
kernel-obs-build
kernel-obs-build-debugsource

Install security update from vendor's repository.

linux (Ubuntu package) - addressed in versions 5.15.0-202.212, 6.8.0-149.149, 7.0.0-42.42
linux-kvm (Ubuntu package) - update to 5.15.0-1111.116
linux-aws (Ubuntu package) - addressed in versions 5.15.0-1119.126, 6.8.0-1069.74, 7.0.0-1016.17
linux-gcp (Ubuntu package) - addressed in versions 5.15.0-1120.130, 6.8.0-1073.81, 7.0.0-1016.18
linux-azure (Ubuntu package) - addressed in versions 5.15.0-1125.134, 6.8.0-1073.82, 7.0.0-1020.21
linux-raspi (Ubuntu package) - addressed in versions 5.15.0-1113.116, 6.8.0-1068.72, 7.0.0-1023.23
linux-oracle (Ubuntu package) - addressed in versions 5.15.0-1116.122, 6.8.0-1067.71, 7.0.0-1015.16
linux-lowlatency (Ubuntu package) - addressed in versions 5.15.0-197.207, 6.8.0-149.149.1
linux-gke (Ubuntu package) - addressed in versions 5.15.0-1115.121, 6.8.0-1068.77, 7.0.0-1010.11
linux-aws-5.15 (Ubuntu package) - update to 5.15.0-1119.126~20.04.1
linux-lowlatency-hwe-5.15 (Ubuntu package) - update to 5.15.0-197.207~20.04.1
linux-hwe-5.15 (Ubuntu package) - update to 5.15.0-202.212~20.04.1
linux-fips (Ubuntu package) - update to 5.15.0-202.212+fips1
linux-azure-5.15 (Ubuntu package) - update to 5.15.0-1125.134~20.04.1
linux-azure-fde-5.15 (Ubuntu package) - update to 5.15.0-1124.133~20.04.1
linux-nvidia-tegra-igx (Ubuntu package) - update to 5.15.0-1059.59
linux-realtime (Ubuntu package) - addressed in versions 5.15.0-1118.127, 6.8.1-1064.65, 7.0.0-43.43.1
linux-intel-iotg (Ubuntu package) - update to 5.15.0-1114.120
linux-nvidia-tegra (Ubuntu package) - update to 5.15.0-1070.72
linux-gkeop (Ubuntu package) - addressed in versions 5.15.0-1102.110, 6.8.0-1053.57
linux-nvidia (Ubuntu package) - addressed in versions 5.15.0-1114.115, 6.8.0-1067.70
linux-ibm-5.15 (Ubuntu package) - update to 5.15.0-1113.117~20.04.1
linux-ibm (Ubuntu package) - addressed in versions 5.15.0-1113.117, 6.8.0-1069.70, 7.0.0-1017.17
linux-intel-iotg-5.15 (Ubuntu package) - update to 5.15.0-1114.120~20.04.1
linux-oracle-5.15 (Ubuntu package) - update to 5.15.0-1116.122~20.04.1
linux-gcp-5.15 (Ubuntu package) - update to 5.15.0-1120.130~20.04.1
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1070.72~20.04.1
linux-azure-fde (Ubuntu package) - addressed in versions 5.15.0-1124.133, 6.8.0-1071.78, 7.0.0-1019.19
linux-intel-iot-realtime (Ubuntu package) - update to 5.15.0-1111.115
linux-gcp-fips (Ubuntu package) - addressed in versions 5.15.0-1120.130+fips1, 6.8.0-1073.81+fips1
linux-aws-fips (Ubuntu package) - addressed in versions 5.15.0-1119.126+fips1, 6.8.0-1069.74+fips1
linux-azure-fips (Ubuntu package) - addressed in versions 5.15.0-1125.134+fips1, 6.8.0-1073.82+fips1
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-149.149~22.04.1
linux-lowlatency-hwe-6.8 (Ubuntu package) - update to 6.8.0-149.149.1~22.04.1
linux-azure-fde-6.8 (Ubuntu package) - update to 6.8.0-1071.78~22.04.1
linux-azure-6.8 (Ubuntu package) - update to 6.8.0-1073.82~22.04.1
linux-aws-6.8 (Ubuntu package) - update to 6.8.0-1069.74~22.04.1
linux-oracle-6.8 (Ubuntu package) - update to 6.8.0-1067.71~22.04.1
linux-nvidia-lowlatency (Ubuntu package) - update to 6.8.0-1067.70.1
linux-vmware (Ubuntu package) - update to 6.8.0-1010.10
linux-ibm-6.8 (Ubuntu package) - update to 6.8.0-1069.70~22.04.1
linux-gcp-6.8 (Ubuntu package) - update to 6.8.0-1073.81~22.04.1
linux-raspi-realtime (Ubuntu package) - update to 6.8.0-2056.58
linux-realtime-6.8 (Ubuntu package) - update to 6.8.1-1064.65~22.04.1
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oracle-7.0 (Ubuntu package) - update to 7.0.0-1016.18~24.04.1
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1017.19~24.04.1
linux-azure-fde-7.0 (Ubuntu package) - update to 7.0.0-1019.19~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
linux-aws-7.0 (Ubuntu package) - update to 7.0.0-1017.18~24.04.1
kgraft-patch-4_12_14-122_328-default - update to 1-8.5.1
kernel-default-debugsource - addressed in versions 4.12.14-122.328.1, 6.4.0-159998.55.1
kernel-default - addressed in versions 4.12.14-122.328.1, 6.4.0-159998.55.1
kernel-default-man - update to 4.12.14-122.328.1
kernel-macros - update to 4.12.14-122.328.1
kernel-devel - update to 4.12.14-122.328.1
kernel-source - update to 4.12.14-122.328.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.328.1, 6.4.0-159998.55.1
kernel-default-base - update to 4.12.14-122.328.1
kernel-default-devel - addressed in versions 4.12.14-122.328.1, 6.4.0-159998.55.1
cluster-md-kmp-default - update to 4.12.14-122.328.1
gfs2-kmp-default - update to 4.12.14-122.328.1
ocfs2-kmp-default-debuginfo - update to 4.12.14-122.328.1
gfs2-kmp-default-debuginfo - update to 4.12.14-122.328.1
dlm-kmp-default - update to 4.12.14-122.328.1
ocfs2-kmp-default - update to 4.12.14-122.328.1
kernel-default-base-debuginfo - update to 4.12.14-122.328.1
dlm-kmp-default-debuginfo - update to 4.12.14-122.328.1
cluster-md-kmp-default-debuginfo - update to 4.12.14-122.328.1
kernel-syms - addressed in versions 4.12.14-122.328.1, 6.4.0-159998.55.1
kernel-default-kgraft - update to 4.12.14-122.328.1
kernel-default-debuginfo - update to 4.12.14-122.328.1
kernel-default-kgraft-devel - update to 4.12.14-122.328.1
kernel-64kb - update to 6.4.0-159998.55.1
kernel-64kb-debugsource - update to 6.4.0-159998.55.1
kernel-64kb-devel - update to 6.4.0-159998.55.1
kernel-obs-build - update to 6.4.0-159998.55.1
kernel-obs-build-debugsource - update to 6.4.0-159998.55.1

• https://git.kernel.org/stable/c/355bfd57ca4ca881c6eb03ca813b440a094b1f44
• https://git.kernel.org/stable/c/362726c9c6e56eea4262109183e49868c39ccd3a
• https://git.kernel.org/stable/c/43a556b2fd43f2df6dded59c2e26560a27874c24
• https://git.kernel.org/stable/c/56f0aa75c7640e46397ef73bea251fcbef9150c0
• https://git.kernel.org/stable/c/825b95561d7b7c393df9e7bc295451aaeadc3d18
• https://git.kernel.org/stable/c/b405c2f96ae2e37375105881890f7738833b1d62
• https://git.kernel.org/stable/c/d4b1a13b1eff2e80925c7368ffdeaaa50cba93df
• https://git.kernel.org/stable/c/d8d686dd5662a7c4745e4515f1237a9f3b7df181
• https://git.kernel.org/stable/c/eb71d5a1ea8ff2683e394b48ae3cd676037ab4c2

• NULL pointer dereference in Linux kernel bluetooth rfcomm
• SUSE update for the Linux Kernel
• Ubuntu update for linux-azure-fde
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more
• Ubuntu update for linux-nvidia-tegra, linux-nvidia-tegra-5.15, linux-nvidia-tegra-igx
• Ubuntu update for linux, linux-aws, linux-aws-5.15 and more
• SUSE update for the Linux Kernel
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws-7.0, linux-azure-fde, linux-azure-fde-7.0 and more
• Ubuntu update for linux-aws-fips, linux-gcp-fips, linux-gkeop and more
• Ubuntu update for linux-raspi
• Ubuntu update for linux-azure-6.8, linux-azure-fde-6.8
• Ubuntu update for linux-oracle-6.8, linux-raspi, linux-raspi-realtime
• Ubuntu update for linux-aws-6.8, linux-gcp-6.8, linux-ibm-6.8 and more
• Ubuntu update for linux, linux-aws, linux-azure and more
• Ubuntu update for linux-raspi
• Ubuntu update for linux-azure-fde
• Ubuntu update for linux-nvidia-lowlatency
• Ubuntu update for linux-hwe-6.8