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High · 8.2 CVE-2025-37749 EUVD-2025-13070GHSA-v3g9-9rfh-r7cr

net: ppp: Add bound checking for skb data on ppp_sync_txmung

Published May 1, 2025 · Updated Aug 5, 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-fde-6.8 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-lts-xenial 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: ppp: Add bound checking for skb data on ppp_sync_txmung

Ensure we have enough data in linear buffer from skb before accessing
initial bytes. This prevents potential out-of-bounds accesses
when processing short packets.

When ppp_sync_txmung receives an incoming package with an empty
payload:
(remote) gef➤ p *(struct pppoe_hdr *) (skb->head + skb->network_header)
$18 = {
type = 0x1,
ver = 0x1,
code = 0x0,
sid = 0x2,
length = 0x0,
tag = 0xffff8880371cdb96
}

from the skb struct (trimmed)
tail = 0x16,
end = 0x140,
head = 0xffff88803346f400 "4",
data = 0xffff88803346f416 ":\377",
truesize = 0x380,
len = 0x0,
data_len = 0x0,
mac_len = 0xe,
hdr_len = 0x0,

it is not safe to access data[2].

[pabeni@redhat.com: fixed subj typo]

Affected products

VendorProductAffectedFixed
Linux Linux 2.6.12 5.4.293

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 6.8.0-1016.20 —
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 6.8.0-100.100 USN-8028-1
Ubuntu 24.04 LTS linux-aws +1 6.8.0-1046.49 USN-8028-5
Ubuntu 24.04 LTS linux-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-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-ibm 6.8.0-1044.44 USN-8028-8
Ubuntu 24.04 LTS linux-intel +10 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-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-xilinx 6.8.0-1023.24 USN-8052-2
Show 19 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 +1 6.8.0-1046.49~22.04.1 USN-8028-5
Ubuntu 22.04 LTS linux-azure 5.15.0-1094.103 USN-7711-1
Ubuntu 22.04 LTS linux-azure-6.8 6.8.0-1051.57~22.04.1 USN-8126-1
Ubuntu 22.04 LTS linux-azure-fde 5.15.0-1094.103.1 —
Ubuntu 22.04 LTS linux-azure-fde-6.8 6.8.0-1046.53~22.04.1 —
Ubuntu 22.04 LTS linux-gcp 5.15.0-1087.96 USN-7654-1
Ubuntu 22.04 LTS linux-gcp-6.8 6.8.0-1047.50~22.04.2 USN-8031-1
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 +1 6.8.0-100.100~22.04.1 USN-8028-6
Ubuntu 22.04 LTS linux-ibm 5.15.0-1080.83 USN-7654-1
Ubuntu 22.04 LTS linux-ibm-6.8 6.8.0-1044.44~22.04.1 USN-8028-8
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 6.8.0-100.100.1~22.04.1 USN-8028-6
Ubuntu 22.04 LTS linux-nvidia 5.15.0-1082.83 USN-7654-1
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 6.8.0-1043.44~22.04.1 USN-8028-5
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-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 6.8.0-2037.38 USN-8028-3
Ubuntu Pro Realtime 24.04 LTS linux-realtime 6.8.1-1041.42 USN-8028-3
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 6.8.1-1041.42~22.04.1 USN-8028-2
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 16.04 LTS linux-fips No fix yet —
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
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-updates 16.04 LTS linux-fips 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 +7 No fix yet —
Ubuntu Pro 14.04 LTS linux +3 No fix yet —
ReleasePackageFixed inAdvisory
RHEL 10 rv +76 6.12.0-124.8.1.el10_1 RHSA-2025:20095
RHEL 9 rv +77 5.14.0-570.17.1.el9_6 RHSA-2025:7903
Show 1 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
RHEL 9.4 EUS bpftool 7.3.0-427.70.1.el9_4 RHSA-2025:8248
RHEL 9.4 EUS rv +64 5.14.0-427.70.1.el9_4 RHSA-2025:8248

AlmaLinux

Errata ↗
ReleasePackageFixed inAdvisory
AlmaLinux 10 rv +74 6.12.0-124.8.1.el10_1 ALSA-2025:20095
AlmaLinux 9 rv +75 5.14.0-570.17.1.el9_6 ALSA-2025:7903

Rocky Linux

Errata ↗
ReleasePackageFixed inAdvisory
Rocky Linux 10 kernel 6.12.0-124.8.1.el10_1 RLSA-2025:20095
ReleasePackageFixed inAdvisory
SLES 15 SP7 kernel-64kb +6 6.4.0-150700.53.3.1 SUSE-SU-2025:01951-1
SLES 15 SP7 kernel-azure +2 6.4.0-150700.20.3.1 SUSE-SU-2025:01967-1
SLES 15 SP7 kernel-default-base 6.4.0-150700.53.3.1.150700.17.2.1 SUSE-SU-2025:01951-1
SLES 15 SP6 kernel-64kb +6 6.4.0-150600.23.53.1 SUSE-SU-2025:02000-1
SLES 15 SP6 kernel-azure +2 6.4.0-150600.8.40.1 SUSE-SU-2025:01965-1
SLES 15 SP6 kernel-coco +3 6.4.0-15061.21.coco15sp6.1 SUSE-SU-2025:01919-1
SLES 15 SP6 kernel-default-base 6.4.0-150600.23.53.1.150600.12.24.1 SUSE-SU-2025:02000-1
SLES 12 SP5 kernel-syms +2 4.12.14-122.261.1 SUSE-SU-2025:01983-1
Show 7 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLE Micro 6.1 kernel-default-base 6.4.0-30.1.21.8 SUSE-SU-2025:20419-1
SLE Micro 6.1 kernel-rt +1 6.4.0-33.1 SUSE-SU-2025:20421-1
SLE Micro 6.1 kernel-source +2 6.4.0-30.1 SUSE-SU-2025:20419-1
SLE Micro 6.0 kernel-default-base 6.4.0-30.1.21.8 SUSE-SU-2025:20408-1
SLE Micro 6.0 kernel-rt +1 6.4.0-33.1 SUSE-SU-2025:20413-1
SLE Micro 6.0 kernel-source +2 6.4.0-30.1 SUSE-SU-2025:20408-1
SLE Live Patching 15 SP7 kernel-default 6.4.0-150700.53.3.1 SUSE-SU-2025:01951-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7-RT_Update_1 1-150700.1.3.1 SUSE-SU-2025:01972-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7_Update_1 1-150700.15.3.1 SUSE-SU-2025:01951-1
SLE Live Patching 15 SP6 kernel-default 6.4.0-150600.23.53.1 SUSE-SU-2025:02000-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6-RT_Update_11 1-150600.1.3.2 SUSE-SU-2025:01964-1
SLE Live Patching 15 SP6 kernel-livepatch-SLE15-SP6_Update_12 1-150600.13.3.1 SUSE-SU-2025:02000-1
SLE Live Patching 12 SP5 kernel-default 4.12.14-122.261.1 SUSE-SU-2025:01983-1
SLE Live Patching 12 SP5 kgraft-patch-SLE12-SP5_Update_69 1-8.3.1 SUSE-SU-2025:01983-1
SUSE Real Time Module 15 SP7 kernel-rt +3 6.4.0-150700.7.3.1 SUSE-SU-2025:01972-1
SUSE Real Time Module 15 SP6 kernel-rt +3 6.4.0-150600.10.39.1 SUSE-SU-2025:01964-1
ReleasePackageFixed inAdvisory
openSUSE Leap 15.6 dtb-aarch64 +10 6.4.0-150600.23.53.1 SUSE-SU-2025:02000-1
openSUSE Leap 15.6 kernel-azure +2 6.4.0-150600.8.40.1 SUSE-SU-2025:01965-1
openSUSE Leap 15.6 kernel-default-base 6.4.0-150600.23.53.1.150600.12.24.1 SUSE-SU-2025:02000-1
openSUSE Leap 15.6 kernel-rt +3 6.4.0-150600.10.39.1 SUSE-SU-2025:01964-1

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 9 rv +28 5.14.0-570.17.1.0.1.el9_6 ELSA-2025-7903
Oracle Linux 8 bpftool +18 5.15.0-310.184.5.2.el9uek ELSA-2025-20470
Oracle Linux 7 kernel-uek +6 5.4.17-2136.345.5.3.el8uek ELSA-2025-20471
Oracle Linux 7 kernel-uek-tools 5.4.17-2136.345.5.3.el7uek ELSA-2025-20471

Advisories 50

References