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Critical · 9.8 CVE-2025-38566 EUVD-2025-27905GHSA-64hp-5254-q6pc

sunrpc: fix handling of server side tls alerts

Published Aug 19, 2025 · Updated Oct 15, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: kernel 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-5.19 Package: linux-aws-5.3 Package: linux-aws-5.8 Package: linux-aws-6.14 Package: linux-aws-6.2 Package: linux-aws-6.5 Package: linux-aws-6.8 Package: linux-aws-fips Package: linux-azure Package: linux-azure-5.11 Package: linux-azure-5.13 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-6.2 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-6.14 Package: linux-azure-fde-6.2 Package: linux-azure-fde-6.8 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-5.19 Package: linux-gcp-5.3 Package: linux-gcp-5.8 Package: linux-gcp-6.11 Package: linux-gcp-6.14 Package: linux-gcp-6.2 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-5.19 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-6.8 Package: linux-intel Package: linux-intel-5.13 Package: linux-intel-iot-realtime Package: linux-lowlatency 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-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-6.5 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-5.3 Package: linux-oracle-5.8 Package: linux-oracle-6.14 Package: linux-oracle-6.5 Package: linux-oracle-6.8 Package: linux-raspi Package: linux-raspi-realtime Package: linux-raspi2 Package: linux-realtime Package: linux-realtime-6.14 Package: linux-realtime-6.8 Package: linux-riscv Package: linux-riscv-5.11 Package: linux-riscv-5.19 Package: linux-riscv-5.8 Package: linux-riscv-6.14 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 Platform: Linux Ecosystem: Azure Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

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

sunrpc: fix handling of server side tls alerts

Scott Mayhew discovered a security exploit in NFS over TLS in
tls_alert_recv() due to its assumption it can read data from
the msg iterator's kvec..

kTLS implementation splits TLS non-data record payload between
the control message buffer (which includes the type such as TLS
aler or TLS cipher change) and the rest of the payload (say TLS
alert's level/description) which goes into the msg payload buffer.

This patch proposes to rework how control messages are setup and
used by sock_recvmsg().

If no control message structure is setup, kTLS layer will read and
process TLS data record types. As soon as it encounters a TLS control
message, it would return an error. At that point, NFS can setup a
kvec backed msg buffer and read in the control message such as a
TLS alert. Msg iterator can advance the kvec pointer as a part of
the copy process thus we need to revert the iterator before calling
into the tls_alert_recv.

Affected products

VendorProductAffectedFixed
Linux Linux 6.4 6.6.102

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 6.16.3-1 —
Debian 13 linux 6.12.43-1 —
ReleasePackageFixed inAdvisory
Ubuntu Nvidia-BlueField 24.04 LTS linux-bluefield 6.8.0-1016.20 —
Ubuntu 25.10 linux-azure-fde No fix yet —
Ubuntu 24.04 LTS linux 6.8.0-100.100 USN-8028-1
Ubuntu 24.04 LTS linux-aws +1 6.8.0-1046.49 USN-8028-5
Ubuntu 24.04 LTS linux-aws-6.14 +2 6.14.0-1017.17~24.04.1 USN-7934-1, USN-7879-3
Ubuntu 24.04 LTS linux-azure 6.8.0-1046.52 USN-8074-1
Ubuntu 24.04 LTS linux-azure-fde 6.8.0-1046.53 —
Ubuntu 24.04 LTS linux-azure-nvidia 6.8.0-1039.42 —
Ubuntu 24.04 LTS linux-gcp 6.8.0-1047.50 USN-8031-3
Ubuntu 24.04 LTS linux-gcp-6.14 6.14.0-1020.21~24.04.1 USN-7879-4
Ubuntu 24.04 LTS linux-gke 6.8.0-1043.48 USN-8031-3
Ubuntu 24.04 LTS linux-gkeop 6.8.0-1030.33 USN-8028-5
Ubuntu 24.04 LTS linux-hwe-6.14 6.14.0-36.36~24.04.1 USN-7879-1
Ubuntu 24.04 LTS linux-ibm 6.8.0-1044.44 USN-8028-8
Ubuntu 24.04 LTS linux-intel +12 No fix yet —
Ubuntu 24.04 LTS linux-lowlatency 6.8.0-100.100.1 USN-8052-1
Ubuntu 24.04 LTS linux-nvidia-lowlatency 6.8.0-1046.49.1 USN-8028-7
Ubuntu 24.04 LTS linux-nvidia-tegra 6.8.0-1020.20 —
Ubuntu 24.04 LTS linux-oem-6.14 6.14.0-1016.16 USN-7880-1
Ubuntu 24.04 LTS linux-oracle 6.8.0-1043.44 USN-8028-5
Ubuntu 24.04 LTS linux-raspi 6.8.0-1047.51 USN-8028-1
Ubuntu 24.04 LTS linux-riscv-6.14 6.14.0-36.36.1~24.04.1 —
Ubuntu 24.04 LTS linux-xilinx 6.8.0-1023.24 USN-8052-2
Ubuntu 22.04 LTS linux-aws-6.8 +1 6.8.0-1046.49~22.04.1 USN-8028-5
Ubuntu 22.04 LTS linux-azure-6.8 6.8.0-1051.57~22.04.1 USN-8126-1
Ubuntu 22.04 LTS linux-azure-fde-6.8 6.8.0-1046.53~22.04.1 —
Ubuntu 22.04 LTS linux-gcp-6.8 6.8.0-1047.50~22.04.2 USN-8031-1
Ubuntu 22.04 LTS linux-hwe-6.8 +1 6.8.0-100.100~22.04.1 USN-8028-6
Ubuntu 22.04 LTS linux-ibm-6.8 6.8.0-1044.44~22.04.1 USN-8028-8
Ubuntu 22.04 LTS linux-lowlatency-hwe-6.8 6.8.0-100.100.1~22.04.1 USN-8028-6
Ubuntu 22.04 LTS linux-oracle-6.8 6.8.0-1043.44~22.04.1 USN-8028-5
Ubuntu 22.04 LTS linux-riscv +32 No fix yet —
Ubuntu 20.04 LTS linux-gke +28 No fix yet —
Show 5 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
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 6.8.0-2037.38 USN-8028-3
Ubuntu Pro Realtime 24.04 LTS linux-realtime 6.8.1-1041.42 USN-8028-3
Ubuntu Pro Realtime 24.04 LTS linux-realtime-6.14 6.14.0-1016.16~24.04.1 USN-7879-2
Ubuntu Pro Realtime 22.04 LTS linux-realtime-6.8 6.8.1-1041.42~22.04.1 USN-8028-2
Ubuntu Pro FIPS-updates 24.04 LTS linux-aws-fips 6.8.0-1046.49+fips1 USN-8028-4
Ubuntu Pro FIPS-updates 24.04 LTS linux-azure-fips 6.8.0-1046.52+fips1 USN-8074-2
Ubuntu Pro FIPS-updates 24.04 LTS linux-fips 6.8.0-100.100+fips1 USN-8028-4
Ubuntu Pro FIPS-updates 24.04 LTS linux-gcp-fips 6.8.0-1047.50+fips1 USN-8031-2
ReleasePackageFixed inAdvisory
RHEL 10 rv +77 6.12.0-55.34.1.el10_0 RHSA-2025:16354
RHEL 9 rv +77 5.14.0-570.55.1.el9_6 RHSA-2025:21112, RHSA-2025:18281
Show 1 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
RHEL 9.4 EUS bpftool 7.3.0-427.94.1.el9_4 RHSA-2025:17958
RHEL 9.4 EUS rv +64 5.14.0-427.94.1.el9_4 RHSA-2025:17958

AlmaLinux

Errata ↗
ReleasePackageFixed inAdvisory
AlmaLinux 10 kernel-doc +1 6.12.0-55.34.1.el10_0 ALSA-2025:16354
AlmaLinux 9 rv +75 5.14.0-570.55.1.el9_6 ALSA-2025:18281

Rocky Linux

Errata ↗
ReleasePackageFixed inAdvisory
Rocky Linux 10 kernel 6.12.0-55.34.1.el10_0 RLSA-2025:16354
ReleasePackageFixed inAdvisory
SLES 15 SP7 kernel-64kb +6 6.4.0-150700.53.16.1 SUSE-SU-2025:03290-1
SLES 15 SP7 kernel-azure +1 6.4.0-150700.20.15.2 SUSE-SU-2025:03633-1
SLES 15 SP7 kernel-default-base 6.4.0-150700.53.16.1.150700.17.11.2 SUSE-SU-2025:03290-1
SLES 15 SP7 kernel-syms-azure 6.4.0-150700.20.15.1 SUSE-SU-2025:03633-1
SLES 15 SP6 kernel-64kb +6 6.4.0-150600.23.70.1 SUSE-SU-2025:03301-1
SLES 15 SP6 kernel-azure +2 6.4.0-150600.8.52.1 SUSE-SU-2025:03634-1
SLES 15 SP6 kernel-coco +3 6.4.0-15061.32.coco15sp6.1 SUSE-SU-2025:03602-1
SLES 15 SP6 kernel-default-base 6.4.0-150600.23.70.1.150600.12.30.2 SUSE-SU-2025:03301-1
Show 9 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLES for SAP 16.0 kernel-64kb +7 6.12.0-160000.6.1 SUSE-SU-2025:21139-1
SLES for SAP 16.0 kernel-default-base 6.12.0-160000.6.1.160000.2.4 SUSE-SU-2025:21139-1
SLES 16.0 kernel-64kb +7 6.12.0-160000.6.1 SUSE-SU-2025:21179-1, SUSE-SU-2025:21139-1
SLES 16.0 kernel-default-base 6.12.0-160000.6.1.160000.2.4 SUSE-SU-2025:21139-1
SLE Micro 6.2 kernel-default-base 6.12.0-160000.6.1.160000.2.4 SUSE-SU-2025:21074-1
SLE Micro 6.2 kernel-rt +5 6.12.0-160000.6.1 SUSE-SU-2026:20560-1, SUSE-SU-2025:21074-1
SLE Micro 6.1 kernel-default-base 6.4.0-34.1.21.11 SUSE-SU-2025:20669-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0-RT_Update_10 6-1.1 SUSE-SU-2025:20918-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0-RT_Update_4 11-1.1 SUSE-SU-2025:20912-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0-RT_Update_5 10-1.1 SUSE-SU-2025:20913-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0-RT_Update_7 8-1.3 SUSE-SU-2025:20915-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0-RT_Update_9 6-1.2 SUSE-SU-2025:20917-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0_Update_10 +1 2-1.1 SUSE-SU-2025:20919-1, SUSE-SU-2025:20908-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0_Update_2 +1 14-1.1 SUSE-SU-2025:20920-1, SUSE-SU-2025:20909-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0_Update_4 12-1.2 SUSE-SU-2025:20907-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0_Update_5 10-1.2 SUSE-SU-2025:20903-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0_Update_6 +1 8-3.1 SUSE-SU-2025:20914-1, SUSE-SU-2025:20905-1
SLE Micro 6.1 kernel-livepatch-MICRO-6-0_Update_7 +3 7-1.2 SUSE-SU-2025:20916-1, SUSE-SU-2025:20906-1, SUSE-SU-2025:20904-1
SLE Micro 6.1 kernel-rt +1 6.4.0-36.1 SUSE-SU-2025:20756-1
SLE Micro 6.1 kernel-source +2 6.4.0-34.1 SUSE-SU-2025:20669-1
SLE Micro 6.0 kernel-default-base 6.4.0-34.1.21.11 SUSE-SU-2025:20653-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0-RT_Update_10 6-1.1 SUSE-SU-2025:20879-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0-RT_Update_4 11-1.1 SUSE-SU-2025:20873-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0-RT_Update_5 10-1.1 SUSE-SU-2025:20874-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0-RT_Update_7 8-1.3 SUSE-SU-2025:20876-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0-RT_Update_9 6-1.2 SUSE-SU-2025:20878-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0_Update_10 +1 2-1.1 SUSE-SU-2025:20889-1, SUSE-SU-2025:20880-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0_Update_2 +1 14-1.1 SUSE-SU-2025:20890-1, SUSE-SU-2025:20886-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0_Update_3 +1 14-1.2 SUSE-SU-2025:20891-1, SUSE-SU-2025:20884-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0_Update_4 12-1.2 SUSE-SU-2025:20885-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0_Update_5 10-1.2 SUSE-SU-2025:20881-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0_Update_6 +1 8-3.1 SUSE-SU-2025:20887-1, SUSE-SU-2025:20875-1
SLE Micro 6.0 kernel-livepatch-MICRO-6-0_Update_7 +3 7-1.2 SUSE-SU-2025:20888-1, SUSE-SU-2025:20883-1, SUSE-SU-2025:20882-1
SLE Micro 6.0 kernel-rt +1 6.4.0-36.1 SUSE-SU-2025:20739-1
SLE Micro 6.0 kernel-source +2 6.4.0-34.1 SUSE-SU-2025:20653-1
SLE Live Patching 15 SP7 kernel-default 6.4.0-150700.53.16.1 SUSE-SU-2025:03290-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7-RT_Update_0 6-150700.3.1 SUSE-SU-2025:03650-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7-RT_Update_4 1-150700.1.3.2 SUSE-SU-2025:03382-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7_Update_0 6-150700.3.15.1 SUSE-SU-2025:3765-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7_Update_1 +2 6-150700.2.1 SUSE-SU-2025:3772-1, SUSE-SU-2025:3771-1, SUSE-SU-2025:03646-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7_Update_3 +1 2-150700.2.1 SUSE-SU-2025:3770-1, SUSE-SU-2025:03643-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7_Update_4 1-150700.15.3.2 SUSE-SU-2025:03290-1
SLE Live Patching 15 SP6 kernel-default 6.4.0-150600.23.70.1 SUSE-SU-2025:03301-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6-RT_Update_15 1-150600.1.3.1 SUSE-SU-2025:03272-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6-RT_Update_5 17-150600.2.1 SUSE-SU-2025:03638-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_10 +1 8-150600.2.1 SUSE-SU-2025:3762-1, SUSE-SU-2025:03650-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_11 7-150600.2.1 SUSE-SU-2025:3755-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_13 +1 6-150600.2.1 SUSE-SU-2025:3764-1, SUSE-SU-2025:03646-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_14 +1 2-150600.2.1 SUSE-SU-2025:3770-1, SUSE-SU-2025:03643-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_15 1-150600.13.3.2 SUSE-SU-2025:03301-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_4 +1 19-150600.2.1 SUSE-SU-2025:3742-1, SUSE-SU-2025:03636-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_6 14-150600.2.1 SUSE-SU-2025:3748-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_9 9-150600.2.1 SUSE-SU-2025:3768-1
SUSE Real Time Module 15 SP7 kernel-rt +2 6.4.0-150700.7.16.1 SUSE-SU-2025:03382-1
SUSE Real Time Module 15 SP6 kernel-rt +3 6.4.0-150600.10.52.1 SUSE-SU-2025:03272-1
ReleasePackageFixed inAdvisory
openSUSE Leap 16.0 kernel-default-base 6.12.0-160000.6.1.160000.2.4 openSUSE-SU-2025:20081-1
openSUSE Leap 16.0 kernel-rt +10 6.12.0-160000.6.1 openSUSE-SU-2025:20081-1
openSUSE Leap 15.6 dtb-aarch64 +10 6.4.0-150600.23.70.1 SUSE-SU-2025:03301-1
openSUSE Leap 15.6 kernel-azure +2 6.4.0-150600.8.52.1 SUSE-SU-2025:03634-1
openSUSE Leap 15.6 kernel-default-base 6.4.0-150600.23.70.1.150600.12.30.2 SUSE-SU-2025:03301-1
openSUSE Leap 15.6 kernel-rt +3 6.4.0-150600.10.52.1 SUSE-SU-2025:03272-1

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2023 kernel-livepatch-6.12.46-66.121 1:1.0-0.amzn2023 ALAS2023-2025-1208
Amazon Linux 2023 perf6.12 +14 1:6.12.46-66.121.amzn2023 ALAS2023-2025-1208

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 kernel 6.6.104.2-1 —

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 10 rv +28 6.12.0-55.34.1.0.1.el10_0 ELSA-2025-16354
Oracle Linux 9 kernel-uek +34 6.12.0-103.40.4.3.el10uek ELSA-2025-20662, ELSA-2025-20608
Oracle Linux 9 rv +28 5.14.0-570.55.1.0.1.el9_6 ELSA-2025-21112, ELSA-2025-18281
Oracle Linux 8 bpftool +18 5.15.0-316.196.4.2.el9uek ELSA-2026-50113, ELSA-2026-50095

Advisories 50

References