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Critical · 9.8 CVE-2026-52914 EUVD-2026-38717GHSA-637x-w8p5-96wm

batman-adv: fix fragment reassembly length accounting

Published Jun 24, 2026 · Updated Oct 19, 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-5.15 Package: linux-aws-5.19 Package: linux-aws-5.3 Package: linux-aws-5.4 Package: linux-aws-5.8 Package: linux-aws-6.14 Package: linux-aws-6.17 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-6.14 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-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-6.14 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-5.4 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-5.4 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-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-6.17 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-5.4 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-5.4 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: Azure Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

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

batman-adv: fix fragment reassembly length accounting

batman-adv keeps a running payload length for queued fragments and uses it
to validate a fragment chain before reassembly.

That accounting currently allows the accumulated fragment length to be
truncated during updates. As a result, malformed fragment chains can
bypass the intended validation and drive reassembly with inconsistent
length state, leading to a local denial of service.

Fix the accounting by storing the accumulated length in a length-typed
field and rejecting update overflows before the existing validation logic
runs.

The fix was verified against the original reproducer and against valid
fragment reassembly paths.

Affected products

VendorProductAffectedFixed
Linux Linux 3.13 5.10.258

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 7.0.12-1 —
Debian 13 linux 6.12.94-1 —
Debian 12 linux 6.1.176-1 —
ReleasePackageFixed inAdvisory
Ubuntu Nvidia-BlueField 24.04 LTS linux-bluefield 6.8.0-1028.33 —
Ubuntu Nvidia-BlueField 22.04 LTS linux-bluefield 5.15.0-1096.98 —
Ubuntu 26.04 LTS linux 7.0.0-28.28 USN-8566-1
Ubuntu 26.04 LTS linux-aws +2 7.0.0-1009.9 USN-8618-1, USN-8603-1, USN-8568-1
Ubuntu 26.04 LTS linux-gcp +1 7.0.0-1008.8 USN-8593-1, USN-8566-1
Ubuntu 26.04 LTS linux-gke 7.0.0-1003.4 USN-8566-1
Ubuntu 26.04 LTS linux-ibm +1 7.0.0-1010.10 USN-8603-1, USN-8593-1
Ubuntu 26.04 LTS linux-nvidia 7.0.0-1016.16 USN-8663-1
Ubuntu 26.04 LTS linux-nvidia-bos 7.0.0-2016.16 USN-8664-1
Ubuntu 26.04 LTS linux-raspi 7.0.0-1015.15 USN-8618-1
Ubuntu 26.04 LTS linux-riscv +1 7.0.0-28.28.1 USN-8566-1
Ubuntu 25.10 linux +8 No fix yet —
Ubuntu 24.04 LTS linux 6.8.0-137.137 USN-8630-1
Ubuntu 24.04 LTS linux-aws 6.8.0-1062.65 USN-8630-1
Ubuntu 24.04 LTS linux-azure 6.8.0-1064.72 USN-8630-1
Ubuntu 24.04 LTS linux-azure-7.0 7.0.0-1014.14~24.04.1 USN-8728-2
Ubuntu 24.04 LTS linux-azure-fde 6.8.0-1063.70 USN-8630-1
Ubuntu 24.04 LTS linux-azure-fde-7.0 7.0.0-1013.13~24.04.1 —
Ubuntu 24.04 LTS linux-gcp 6.8.0-1065.73 USN-8630-1
Ubuntu 24.04 LTS linux-gcp-7.0 +1 7.0.0-1011.11~24.04.1 USN-8728-3, USN-8728-1
Ubuntu 24.04 LTS linux-gke 6.8.0-1060.68 USN-8630-1
Ubuntu 24.04 LTS linux-gkeop 6.8.0-1047.51 USN-8630-1
Ubuntu 24.04 LTS linux-hwe-7.0 7.0.0-28.28~24.04.1 USN-8569-1
Ubuntu 24.04 LTS linux-ibm 6.8.0-1062.63 USN-8630-1
Ubuntu 24.04 LTS linux-lowlatency 6.8.0-137.137.1 USN-8630-2
Ubuntu 24.04 LTS linux-nvidia 6.8.0-1060.63 USN-8630-1
Ubuntu 24.04 LTS linux-nvidia-6.17 6.17.0-1032.32 USN-8748-1
Ubuntu 24.04 LTS linux-nvidia-7.0 7.0.0-1016.16~24.04.1 USN-8663-1
Ubuntu 24.04 LTS linux-nvidia-lowlatency 6.8.0-1060.63.1 USN-8630-1
Ubuntu 24.04 LTS linux-nvidia-tegra 6.8.0-1031.32 USN-8630-2
Ubuntu 24.04 LTS linux-oem-6.17 6.17.0-1033.33 USN-8911-1
Ubuntu 24.04 LTS linux-oracle 6.8.0-1059.62 USN-8630-2
Ubuntu 24.04 LTS linux-raspi 6.8.0-1062.66 USN-8630-5
Ubuntu 24.04 LTS linux-riscv +26 No fix yet —
Ubuntu 24.04 LTS linux-riscv-7.0 7.0.0-28.28.1~24.04.3 —
Ubuntu 24.04 LTS linux-vmware 6.8.0-1008.8 —
Ubuntu 24.04 LTS linux-xilinx 6.8.0-1034.35 USN-8630-1
Show 19 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 22.04 LTS linux 5.15.0-186.196 USN-8575-1
Ubuntu 22.04 LTS linux-aws 5.15.0-1112.119 USN-8575-2
Ubuntu 22.04 LTS linux-aws-6.8 6.8.0-1062.65~22.04.2 USN-8630-4
Ubuntu 22.04 LTS linux-azure +1 5.15.0-1117.126 USN-8610-1, USN-8575-3
Ubuntu 22.04 LTS linux-azure-6.8 6.8.0-1064.72~22.04.1 USN-8630-1
Ubuntu 22.04 LTS linux-azure-fde-6.8 6.8.0-1063.70~22.04.1 USN-8630-1
Ubuntu 22.04 LTS linux-gcp 5.15.0-1112.122 USN-8575-1
Ubuntu 22.04 LTS linux-gcp-6.8 6.8.0-1065.73~22.04.1 USN-8630-1
Ubuntu 22.04 LTS linux-gke 5.15.0-1108.114 USN-8575-1
Ubuntu 22.04 LTS linux-gkeop 5.15.0-1095.103 USN-8575-1
Ubuntu 22.04 LTS linux-hwe-6.8 6.8.0-138.138~22.04.1 USN-8656-1
Ubuntu 22.04 LTS linux-ibm 5.15.0-1106.110 USN-8575-2
Ubuntu 22.04 LTS linux-ibm-6.8 6.8.0-1062.63~22.04.1 USN-8630-1
Ubuntu 22.04 LTS linux-intel-iotg 5.15.0-1107.113 USN-8620-4
Ubuntu 22.04 LTS linux-kvm 5.15.0-1104.109 USN-8575-1
Ubuntu 22.04 LTS linux-lowlatency 5.15.0-184.194 USN-8575-1
Ubuntu 22.04 LTS linux-lowlatency-hwe-6.8 6.8.0-137.137.1~22.04.1 USN-8630-2
Ubuntu 22.04 LTS linux-nvidia 5.15.0-1107.108 USN-8575-2
Ubuntu 22.04 LTS linux-nvidia-6.8 6.8.0-1060.63~22.04.1 USN-8630-1
Ubuntu 22.04 LTS linux-nvidia-tegra 5.15.0-1064.66 USN-8576-2
Ubuntu 22.04 LTS linux-nvidia-tegra-igx 5.15.0-1053.53 USN-8576-2
Ubuntu 22.04 LTS linux-oracle 5.15.0-1109.115 USN-8575-3
Ubuntu 22.04 LTS linux-oracle-6.8 6.8.0-1059.62~22.04.1 USN-8630-3
Ubuntu 22.04 LTS linux-raspi 5.15.0-1106.109 USN-8668-2
Ubuntu 22.04 LTS linux-riscv +32 No fix yet —
Ubuntu 22.04 LTS linux-riscv-6.8 6.8.0-137.137~22.04.1 —
Ubuntu 22.04 LTS linux-xilinx-zynqmp 5.15.0-1075.79 USN-8575-1
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 6.8.0-2051.53 USN-8630-5
Ubuntu Pro Realtime 24.04 LTS linux-realtime 6.8.1-1057.58 USN-8630-1
Ubuntu Pro Realtime 24.04 LTS linux-realtime-6.14 +1 No fix yet —
Ubuntu Pro Realtime 22.04 LTS linux-intel-iot-realtime 5.15.0-1104.106 USN-8620-3
Ubuntu Pro Realtime 22.04 LTS linux-realtime 5.15.0-1111.120 USN-8575-1
Ubuntu Pro Realtime 22.04 LTS linux-realtime-6.8 6.8.1-1057.58~22.04.1 USN-8630-1
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 16.04 LTS linux-fips No fix yet —
Ubuntu Pro FIPS-updates 24.04 LTS linux-aws-fips 6.8.0-1062.65+fips1 USN-8630-1
Ubuntu Pro FIPS-updates 24.04 LTS linux-azure-fips 6.8.0-1064.72+fips1 USN-8630-1
Ubuntu Pro FIPS-updates 24.04 LTS linux-fips 6.8.0-137.137+fips1 USN-8630-1
Ubuntu Pro FIPS-updates 24.04 LTS linux-gcp-fips 6.8.0-1065.73+fips1 USN-8630-1
Ubuntu Pro FIPS-updates 22.04 LTS linux-aws-fips 5.15.0-1112.119+fips1 USN-8575-2
Ubuntu Pro FIPS-updates 22.04 LTS linux-azure-fips 5.15.0-1117.126+fips1 USN-8620-2
Ubuntu Pro FIPS-updates 22.04 LTS linux-fips 5.15.0-186.196+fips1 USN-8575-2
Ubuntu Pro FIPS-updates 22.04 LTS linux-gcp-fips 5.15.0-1112.122+fips1 USN-8575-1
Ubuntu Pro FIPS-updates 20.04 LTS linux-aws-fips 5.4.0-1163.174+fips1 USN-8715-2
Ubuntu Pro FIPS-updates 20.04 LTS linux-azure-fips 5.4.0-1167.173+fips1 USN-8666-2
Ubuntu Pro FIPS-updates 20.04 LTS linux-fips 5.4.0-1136.146 USN-8666-1
Ubuntu Pro FIPS-updates 20.04 LTS linux-gcp-fips 5.4.0-1165.174+fips1 USN-8666-3
Ubuntu Pro FIPS-updates 18.04 LTS linux-aws-fips 4.15.0-2134.140 —
Ubuntu Pro FIPS-updates 18.04 LTS linux-azure-fips 4.15.0-2114.120 USN-8644-3
Ubuntu Pro FIPS-updates 18.04 LTS linux-fips 4.15.0-1151.163 —
Ubuntu Pro FIPS-updates 18.04 LTS linux-gcp-fips 4.15.0-2097.103 USN-8644-2
Ubuntu Pro FIPS-updates 16.04 LTS linux-fips 4.4.0-1128.135 USN-8725-1
Ubuntu Pro FIPS-preview 22.04 LTS linux-fips +3 No fix yet —
Ubuntu Pro 20.04 LTS linux 5.4.0-234.254 USN-8666-1
Ubuntu Pro 20.04 LTS linux-aws 5.4.0-1162.173 USN-8666-1
Ubuntu Pro 20.04 LTS linux-aws-5.15 5.15.0-1112.119~20.04.1 USN-8575-2
Ubuntu Pro 20.04 LTS linux-azure 5.4.0-1167.173 USN-8666-1
Ubuntu Pro 20.04 LTS linux-azure-5.15 5.15.0-1117.126~20.04.1 USN-8620-1
Ubuntu Pro 20.04 LTS linux-azure-fde-5.15 5.15.0-1117.126~20.04.2 USN-8620-1
Ubuntu Pro 20.04 LTS linux-bluefield 5.4.0-1121.128 USN-8666-1
Ubuntu Pro 20.04 LTS linux-gcp 5.4.0-1165.174 USN-8666-1
Ubuntu Pro 20.04 LTS linux-gcp-5.15 5.15.0-1112.122~20.04.1 USN-8668-1
Ubuntu Pro 20.04 LTS linux-hwe-5.15 5.15.0-186.196~20.04.1 USN-8575-1
Ubuntu Pro 20.04 LTS linux-ibm 5.4.0-1108.113 USN-8666-1
Ubuntu Pro 20.04 LTS linux-ibm-5.15 +1 5.15.0-1106.110~20.04.1 —
Ubuntu Pro 20.04 LTS linux-intel-iotg-5.15 5.15.0-1107.113~20.04.1 USN-8620-3
Ubuntu Pro 20.04 LTS linux-iot 5.4.0-1066.69 USN-8666-1
Ubuntu Pro 20.04 LTS linux-kvm 5.4.0-1149.158 USN-8667-1
Ubuntu Pro 20.04 LTS linux-lowlatency-hwe-5.15 5.15.0-184.194~20.04.1 USN-8575-1
Ubuntu Pro 20.04 LTS linux-nvidia-tegra-5.15 5.15.0-1064.66~20.04.1 USN-8576-1
Ubuntu Pro 20.04 LTS linux-oracle 5.4.0-1160.170 USN-8666-1
Ubuntu Pro 20.04 LTS linux-oracle-5.15 5.15.0-1109.115~20.04.1 USN-8620-1
Ubuntu Pro 20.04 LTS linux-raspi 5.4.0-1145.158 USN-8666-1
Ubuntu Pro 20.04 LTS linux-xilinx-zynqmp 5.4.0-1080.84 USN-8666-1
Ubuntu Pro 18.04 LTS linux 4.15.0-257.269 —
Ubuntu Pro 18.04 LTS linux-aws 4.15.0-1196.209 —
Ubuntu Pro 18.04 LTS linux-aws-5.4 5.4.0-1162.173~18.04.1 USN-8666-1
Ubuntu Pro 18.04 LTS linux-azure-4.15 4.15.0-1206.221 USN-8644-3
Ubuntu Pro 18.04 LTS linux-azure-5.4 5.4.0-1167.173~18.04.1 USN-8666-2
Ubuntu Pro 18.04 LTS linux-gcp-4.15 4.15.0-1189.206 USN-8644-2
Ubuntu Pro 18.04 LTS linux-gcp-5.4 5.4.0-1165.174~18.04.1 USN-8666-1
Ubuntu Pro 18.04 LTS linux-hwe-5.4 5.4.0-234.254~18.04.1 USN-8666-1
Ubuntu Pro 18.04 LTS linux-ibm-5.4 5.4.0-1108.113~18.04.1 USN-8666-1
Ubuntu Pro 18.04 LTS linux-kvm 4.15.0-1178.183 —
Ubuntu Pro 18.04 LTS linux-oracle 4.15.0-1158.169 USN-8645-1
Ubuntu Pro 18.04 LTS linux-oracle-5.4 5.4.0-1161.171~18.04.1 USN-8715-1
Ubuntu Pro 18.04 LTS linux-raspi-5.4 5.4.0-1145.158~18.04.1 USN-8666-1
Ubuntu Pro 16.04 LTS linux 4.4.0-287.321 USN-8725-1
Ubuntu Pro 16.04 LTS linux-aws 4.4.0-1196.211 USN-8725-2
Ubuntu Pro 16.04 LTS linux-aws-hwe 4.15.0-1196.209~16.04.1 —
Ubuntu Pro 16.04 LTS linux-azure 4.15.0-1206.221~16.04.1 USN-8644-3
Ubuntu Pro 16.04 LTS linux-gcp 4.15.0-1189.206~16.04.1 USN-8644-2
Ubuntu Pro 16.04 LTS linux-hwe 4.15.0-257.269~16.04.1 —
Ubuntu Pro 16.04 LTS linux-kvm 4.4.0-1159.170 USN-8725-1
Ubuntu Pro 16.04 LTS linux-oracle 4.15.0-1158.169~16.04.1 USN-8645-1
Ubuntu Pro 14.04 LTS linux 3.13.0-217.268 USN-8646-1
Ubuntu Pro 14.04 LTS linux-aws 4.4.0-1158.164 USN-8725-1
Ubuntu Pro 14.04 LTS linux-azure 4.15.0-1206.221~14.04.1 USN-8644-3
Ubuntu Pro 14.04 LTS linux-lts-xenial 4.4.0-287.321~14.04.1 USN-8725-1
ReleasePackageFixed inAdvisory
SLES 15 SP7 kernel-64kb +4 6.4.0-150700.53.73.2 SUSE-SU-2026:3166-1
SLES 15 SP7 kernel-default-base 6.4.0-150700.53.73.2.150700.17.41.4 SUSE-SU-2026:3166-1
SLES 15 SP7 kernel-docs +2 6.4.0-150700.53.73.1 SUSE-SU-2026:3166-1
Show 4 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLE Micro 6.1 kernel-rt +4 6.4.0-51.1 SUSE-SU-2026:23194-1, SUSE-SU-2026:23193-1
SLE Micro 6.0 kernel-rt +4 6.4.0-51.1 SUSE-SU-2026:23244-1, SUSE-SU-2026:23241-1
SLE Live Patching 15 SP7 kernel-default 6.4.0-150700.53.73.2 SUSE-SU-2026:3166-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7-RT_Update_18 1-150700.1.5.1 SUSE-SU-2026:3130-1
SLE Live Patching 15 SP7 kernel-livepatch-SLE15-SP7_Update_19 1-150700.15.3.4 SUSE-SU-2026:3166-1
SUSE Real Time Module 15 SP7 kernel-rt +2 6.4.0-150700.7.67.1 SUSE-SU-2026:3130-1

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 kernel 6.6.143.1-1 —

Advisories 50

References