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OpenAdvisories
High · 7.8 CVE-2025-37756 EUVD-2025-13060GHSA-5cvr-qr2r-c7rm

net: tls: explicitly disallow disconnect

Published May 1, 2025 · Updated Oct 15, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: linux Package: linux 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-5.4 Package: linux-aws-5.8 Package: linux-aws-6.2 Package: linux-aws-6.5 Package: linux-aws-6.8 Package: linux-aws-fips Package: linux-aws-hwe Package: linux-azure Package: linux-azure-4.15 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-5.4 Package: linux-azure-5.8 Package: linux-azure-6.11 Package: linux-azure-6.2 Package: linux-azure-6.5 Package: linux-azure-6.8 Package: linux-azure-edge Package: linux-azure-fde Package: linux-azure-fde-5.19 Package: linux-azure-fde-6.2 Package: linux-azure-fips Package: linux-azure-nvidia Package: linux-bluefield Package: linux-fips Package: linux-gcp Package: linux-gcp-4.15 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-5.4 Package: linux-gcp-5.8 Package: linux-gcp-6.11 Package: linux-gcp-6.2 Package: linux-gcp-6.5 Package: linux-gcp-6.8 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-5.4 Package: linux-hwe-5.8 Package: linux-hwe-6.11 Package: linux-hwe-6.2 Package: linux-hwe-6.5 Package: linux-hwe-6.8 Package: linux-hwe-edge Package: linux-ibm Package: linux-ibm-5.15 Package: linux-ibm-5.4 Package: linux-ibm-6.8 Package: linux-intel Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-intel-iotg Package: linux-intel-iotg-5.15 Package: linux-iot 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-6.2 Package: linux-nvidia-6.5 Package: linux-nvidia-6.8 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-6.5 Package: linux-oem-6.8 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-5.4 Package: linux-oracle-5.8 Package: linux-oracle-6.5 Package: linux-oracle-6.8 Package: linux-raspi Package: linux-raspi-5.4 Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime 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-6.5 Package: linux-riscv-6.8 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:

net: tls: explicitly disallow disconnect

syzbot discovered that it can disconnect a TLS socket and then
run into all sort of unexpected corner cases. I have a vague
recollection of Eric pointing this out to us a long time ago.
Supporting disconnect is really hard, for one thing if offload
is enabled we'd need to wait for all packets to be _acked_.
Disconnect is not commonly used, disallow it.

The immediate problem syzbot run into is the warning in the strp,
but that's just the easiest bug to trigger:

WARNING: CPU: 0 PID: 5834 at net/tls/tls_strp.c:486 tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486
RIP: 0010:tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486
Call Trace:
<TASK>
tls_rx_rec_wait+0x280/0xa60 net/tls/tls_sw.c:1363
tls_sw_recvmsg+0x85c/0x1c30 net/tls/tls_sw.c:2043
inet6_recvmsg+0x2c9/0x730 net/ipv6/af_inet6.c:678
sock_recvmsg_nosec net/socket.c:1023 [inline]
sock_recvmsg+0x109/0x280 net/socket.c:1045
__sys_recvfrom+0x202/0x380 net/socket.c:2237

Affected products

VendorProductAffectedFixed
Linux Linux 4.13 5.10.237

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.

ReleasePackageFixed inAdvisory
Debian 14 linux 6.12.25-1 —
Debian 13 linux 6.12.25-1 —
Debian 12 linux 6.1.135-1 —
Debian 11 linux 5.10.237-1 DLA-4178-1
Debian 11 linux-6.1 6.1.137-1~deb11u1 DLA-4193-1
ReleasePackageFixed inAdvisory
Ubuntu Nvidia-BlueField 24.04 LTS linux-bluefield 6.8.0-1012.16 —
Ubuntu Nvidia-BlueField 22.04 LTS linux-bluefield 5.15.0-1072.74 —
Ubuntu 25.10 linux-azure-fde No fix yet —
Ubuntu 25.04 linux 6.14.0-22.22 USN-7594-1
Ubuntu 25.04 linux-aws +3 6.14.0-1007.7 USN-7594-3, USN-7594-2, USN-7594-1
Ubuntu 25.04 linux-gcp 6.14.0-1008.8 USN-7594-1
Ubuntu 25.04 linux-realtime 6.14.0-1004.4 USN-7594-1
Ubuntu 24.04 LTS linux 6.8.0-85.85 USN-7792-1
Ubuntu 24.04 LTS linux-aws 6.8.0-1040.42 USN-7792-1
Ubuntu 24.04 LTS linux-azure 6.8.0-1040.46 USN-7808-1
Ubuntu 24.04 LTS linux-azure-nvidia 6.8.0-1025.27 USN-7809-1
Ubuntu 24.04 LTS linux-gcp 6.8.0-1041.43 USN-7792-1
Ubuntu 24.04 LTS linux-gke 6.8.0-1037.41 USN-7792-1
Ubuntu 24.04 LTS linux-gkeop 6.8.0-1024.26 USN-7792-1
Ubuntu 24.04 LTS linux-ibm 6.8.0-1038.38 USN-7792-1
Ubuntu 24.04 LTS linux-intel +10 No fix yet —
Ubuntu 24.04 LTS linux-lowlatency 6.8.0-85.85.1 USN-7792-1
Ubuntu 24.04 LTS linux-nvidia 6.8.0-1040.43 USN-7792-1
Ubuntu 24.04 LTS linux-nvidia-lowlatency 6.8.0-1040.43.1 USN-7792-1
Ubuntu 24.04 LTS linux-nvidia-tegra 6.8.0-1012.12 —
Ubuntu 24.04 LTS linux-oracle 6.8.0-1037.38 USN-7801-2
Ubuntu 24.04 LTS linux-raspi 6.8.0-1040.44 USN-7792-2
Ubuntu 24.04 LTS linux-xilinx 6.8.0-1018.19 —
Show 17 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 22.04 LTS linux +1 5.15.0-144.157 USN-7654-1
Ubuntu 22.04 LTS linux-aws 5.15.0-1088.95 USN-7654-1
Ubuntu 22.04 LTS linux-aws-6.8 6.8.0-1040.42~22.04.1 USN-7792-3
Ubuntu 22.04 LTS linux-azure 5.15.0-1094.103 USN-7711-1
Ubuntu 22.04 LTS linux-azure-6.8 6.8.0-1040.46~22.04.1 USN-7808-2
Ubuntu 22.04 LTS linux-azure-fde 5.15.0-1094.103.1 —
Ubuntu 22.04 LTS linux-gcp 5.15.0-1087.96 USN-7654-1
Ubuntu 22.04 LTS linux-gcp-6.8 6.8.0-1041.43~22.04.1 USN-7792-1
Ubuntu 22.04 LTS linux-gke +1 5.15.0-1085.91 USN-7654-1
Ubuntu 22.04 LTS linux-gkeop 5.15.0-1070.78 USN-7654-1
Ubuntu 22.04 LTS linux-hwe-6.8 6.8.0-85.85~22.04.1 USN-7801-1
Ubuntu 22.04 LTS linux-ibm 5.15.0-1080.83 USN-7654-1
Ubuntu 22.04 LTS linux-ibm-6.8 6.8.0-1038.38~22.04.1 USN-7792-1
Ubuntu 22.04 LTS linux-intel-iotg 5.15.0-1083.89 USN-7654-1
Ubuntu 22.04 LTS linux-kvm 5.15.0-1084.89 USN-7654-4
Ubuntu 22.04 LTS linux-lowlatency-hwe-6.8 6.8.0-85.85.1~22.04.1 USN-7792-1
Ubuntu 22.04 LTS linux-nvidia 5.15.0-1082.83 USN-7654-1
Ubuntu 22.04 LTS linux-nvidia-6.8 6.8.0-1040.43~22.04.1 USN-7792-1
Ubuntu 22.04 LTS linux-nvidia-tegra 5.15.0-1041.41 USN-7654-1
Ubuntu 22.04 LTS linux-nvidia-tegra-igx 5.15.0-1030.30 USN-7654-1
Ubuntu 22.04 LTS linux-oracle-6.8 6.8.0-1037.38~22.04.1 USN-7801-3
Ubuntu 22.04 LTS linux-raspi 5.15.0-1083.86 USN-7686-1
Ubuntu 22.04 LTS linux-riscv +32 No fix yet —
Ubuntu 22.04 LTS linux-riscv-6.8 6.8.0-86.87~22.04.1 —
Ubuntu 22.04 LTS linux-xilinx-zynqmp 5.15.0-1052.56 USN-7654-5
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-raspi-realtime 6.8.0-2031.32 USN-7800-1
Ubuntu Pro Realtime 24.04 LTS linux-realtime 6.8.1-1035.36 USN-7799-1
Ubuntu Pro Realtime 22.04 LTS linux-intel-iot-realtime 5.15.0-1081.83 USN-7654-2
Ubuntu Pro Realtime 22.04 LTS linux-realtime 5.15.0-1088.97 USN-7654-2
Ubuntu Pro Realtime 22.04 LTS linux-realtime-6.8 6.8.1-1035.36~22.04.1 USN-7799-1
Ubuntu Pro FIPS 20.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS 18.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 24.04 LTS linux-aws-fips 6.8.0-1040.42+fips1 —
Ubuntu Pro FIPS-updates 24.04 LTS linux-azure-fips 6.8.0-1040.46+fips1 —
Ubuntu Pro FIPS-updates 24.04 LTS linux-fips 6.8.0-85.85+fips1 —
Ubuntu Pro FIPS-updates 24.04 LTS linux-gcp-fips 6.8.0-1041.43+fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS linux-aws-fips 5.15.0-1088.95+fips1 USN-7654-3
Ubuntu Pro FIPS-updates 22.04 LTS linux-azure-fips 5.15.0-1094.103+fips1 USN-7712-1
Ubuntu Pro FIPS-updates 22.04 LTS linux-fips 5.15.0-144.157+fips1 USN-7654-3
Ubuntu Pro FIPS-updates 22.04 LTS linux-gcp-fips 5.15.0-1087.96+fips1 USN-7654-3
Ubuntu Pro FIPS-updates 20.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro FIPS-updates 18.04 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 +10 No fix yet —
Ubuntu Pro 20.04 LTS linux-aws-5.15 5.15.0-1088.95~20.04.1 USN-7654-1
Ubuntu Pro 20.04 LTS linux-azure-5.15 5.15.0-1094.103~20.04.1 USN-7712-2
Ubuntu Pro 20.04 LTS linux-gcp-5.15 5.15.0-1087.96~20.04.2 USN-7654-1
Ubuntu Pro 20.04 LTS linux-hwe-5.15 +1 5.15.0-144.157~20.04.1 USN-7654-1
Ubuntu Pro 20.04 LTS linux-ibm-5.15 5.15.0-1080.83~20.04.1 USN-7654-1
Ubuntu Pro 20.04 LTS linux-intel-iotg-5.15 5.15.0-1083.89~20.04.1 USN-7655-1
Ubuntu Pro 20.04 LTS linux-nvidia-tegra-5.15 5.15.0-1041.41~20.04.1 USN-7654-1
Ubuntu Pro 20.04 LTS linux-oracle-5.15 5.15.0-1085.91~20.04.3 USN-7654-1
Ubuntu Pro 20.04 LTS linux-riscv-5.15 5.15.0-1083.87~20.04.1 —
Ubuntu Pro 18.04 LTS linux +12 No fix yet —
Ubuntu Pro 16.04 LTS linux-gcp +4 No fix yet —
Ubuntu Pro 14.04 LTS linux-azure No fix yet —
ReleasePackageFixed inAdvisory
SLES 15 SP7 kernel-64kb +6 6.4.0-150700.53.6.1 SUSE-SU-2025:02307-1
SLES 15 SP7 kernel-azure +2 6.4.0-150700.20.6.1 SUSE-SU-2025:02254-1
SLES 15 SP7 kernel-default-base 6.4.0-150700.53.6.1.150700.17.6.1 SUSE-SU-2025:02307-1
SLES 15 SP6 kernel-64kb +3 6.4.0-150600.23.60.4 SUSE-SU-2025:02538-1
SLES 15 SP6 kernel-azure +2 6.4.0-150600.8.43.1 SUSE-SU-2025:02249-1
SLES 15 SP6 kernel-coco +3 6.4.0-15061.28.coco15sp6.1 SUSE-SU-2025:02923-1
SLES 15 SP6 kernel-default 6.4.0-150600.23.60.5 SUSE-SU-2025:02538-1
SLES 15 SP6 kernel-default-base 6.4.0-150600.23.60.5.150600.12.26.4 SUSE-SU-2025:02538-1
SLES 15 SP6 kernel-docs +1 6.4.0-150600.23.60.3 SUSE-SU-2025:02538-1
SLES 12 SP5 kernel-syms +2 4.12.14-122.266.1 SUSE-SU-2025:02334-1
Show 7 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLE Micro 6.1 kernel-default-base 6.4.0-31.1.21.9 SUSE-SU-2025:20475-1
SLE Micro 6.1 kernel-rt +1 6.4.0-34.1 SUSE-SU-2025:20483-1
SLE Micro 6.1 kernel-source +2 6.4.0-31.1 SUSE-SU-2025:20475-1
SLE Micro 6.0 kernel-default-base 6.4.0-31.1.21.9 SUSE-SU-2025:20493-1
SLE Micro 6.0 kernel-rt +1 6.4.0-34.1 SUSE-SU-2025:20498-1
SLE Micro 6.0 kernel-source +2 6.4.0-31.1 SUSE-SU-2025:20493-1
SLE Live Patching 15 SP7 kernel-default 6.4.0-150700.53.6.1 SUSE-SU-2025:02307-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7-RT_Update_2 1-150700.1.5.1 SUSE-SU-2025:02333-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7_Update_2 1-150700.15.3.1 SUSE-SU-2025:02307-1
SLE Live Patching 15 SP6 kernel-default 6.4.0-150600.23.60.5 SUSE-SU-2025:02538-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6-RT_Update_13 1-150600.1.5.1 SUSE-SU-2025:02335-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_13 1-150600.13.6.4 SUSE-SU-2025:02538-1
SLE Live Patching 12 SP5 kernel-default 4.12.14-122.266.1 SUSE-SU-2025:02334-1
SLE Live Patching 12 SP5 kgraft-patch-SLE12-SP5_Update_70 1-8.5.1 SUSE-SU-2025:02334-1
SUSE Real Time Module 15 SP7 kernel-rt +2 6.4.0-150700.7.8.1 SUSE-SU-2025:02333-1
SUSE Real Time Module 15 SP6 kernel-rt +3 6.4.0-150600.10.44.1 SUSE-SU-2025:02335-1
ReleasePackageFixed inAdvisory
openSUSE Leap 15.6 dtb-aarch64 +2 6.4.0-150600.23.60.3 SUSE-SU-2025:02538-1
openSUSE Leap 15.6 kernel-64kb +5 6.4.0-150600.23.60.4 SUSE-SU-2025:02538-1
openSUSE Leap 15.6 kernel-azure +2 6.4.0-150600.8.43.1 SUSE-SU-2025:02249-1
openSUSE Leap 15.6 kernel-default 6.4.0-150600.23.60.5 SUSE-SU-2025:02538-1
openSUSE Leap 15.6 kernel-default-base 6.4.0-150600.23.60.5.150600.12.26.4 SUSE-SU-2025:02538-1
openSUSE Leap 15.6 kernel-obs-qa 6.4.0-150600.23.60.2 SUSE-SU-2025:02538-1
openSUSE Leap 15.6 kernel-rt +3 6.4.0-150600.10.44.1 SUSE-SU-2025:02335-1

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2023 kernel-livepatch-6.12.25-32.101 +1 1.0-0.amzn2023 ALAS2023-2025-1050, ALAS2023-2025-995
Amazon Linux 2023 perf +14 6.1.140-154.222.amzn2023 ALAS2023-2025-1050, ALAS2023-2025-995
Amazon Linux 2023 perf6.12 +5 6.12.25-32.101.amzn2023 ALAS2023-2025-995

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 9 kernel-uek +34 6.12.0-101.33.4.3.el10uek ELSA-2025-20530, ELSA-2025-20480
Oracle Linux 8 bpftool +18 5.15.0-310.184.5.2.el9uek ELSA-2025-20470

Advisories 44

References