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Vulnerability · Published Jun 24, 2026 · Assigned by Linux

CVE-2026-52931batman-adv: tp_meter: avoid use of uninit sender vars

Critical 9.8

In plain English

A critical-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.5%top 57.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: tp_meter: avoid use of uninit sender vars batadv_tp_recv_ack() and batadv_tp_stop() are only valid for tp_vars in the BATADV_TP_SENDER role. When called with a BATADV_TP_RECEIVER role, it proceeds to read sender-only members that were never initialized, leading to undefined behavior. This can be triggered when a node that is currently acting as a receiver in an ongoing tp_meter session receives a malicious ACK packet. Guard against this by checking tp_vars->role immediately after the lookup and bailing out if it is not BATADV_TP_SENDER, before any of those members are accessed.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.176-1DEBIAN-CVE-2026-52931
Debian:13linux6.12.94-1DEBIAN-CVE-2026-52931
Debian:14linux7.0.12-1DEBIAN-CVE-2026-52931
Ubuntu:22.04:LTSlinux5.15.0-186.196UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux6.8.0-137.137UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux6.8.0-137.137USN-8630-1
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2026-52931
Ubuntu:26.04:LTSlinux7.0.0-28.28UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-aws5.15.0-1112.119UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-aws6.8.0-1062.65USN-8630-1
Ubuntu:24.04:LTSlinux-aws6.8.0-1062.65UBUNTU-CVE-2026-52931
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2026-52931
Ubuntu:26.04:LTSlinux-aws7.0.0-1009.9UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1062.65~22.04.2UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1062.65~22.04.2USN-8630-4
Ubuntu:22.04:LTSlinux-azure5.15.0-1117.126UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-azure6.8.0-1064.72UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-azure6.8.0-1064.72USN-8630-1
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2026-52931
Ubuntu:26.04:LTSlinux-azure7.0.0-1010.10UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1064.72~22.04.1USN-8630-1
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1064.72~22.04.1UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-azure-7.07.0.0-1014.14~24.04.1UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1117.126UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1063.70USN-8630-1
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1063.70UBUNTU-CVE-2026-52931
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-52931
Ubuntu:26.04:LTSlinux-azure-fde7.0.0-1009.9UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-azure-fde-6.86.8.0-1063.70~22.04.1UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-azure-fde-6.86.8.0-1063.70~22.04.1USN-8630-1
Ubuntu:24.04:LTSlinux-azure-fde-7.07.0.0-1013.13~24.04.1UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-gcp5.15.0-1112.122UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-gcp6.8.0-1065.73UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-gcp6.8.0-1065.73USN-8630-1
Ubuntu:25.10linux-gcpno fix listedUBUNTU-CVE-2026-52931
Ubuntu:26.04:LTSlinux-gcp7.0.0-1008.8UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1065.73~22.04.1UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1065.73~22.04.1USN-8630-1
Ubuntu:24.04:LTSlinux-gcp-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-gke5.15.0-1108.114UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-gke6.8.0-1060.68UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-gke6.8.0-1060.68USN-8630-1
Ubuntu:26.04:LTSlinux-gke7.0.0-1003.4UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1095.103UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1047.51USN-8630-1
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1047.51UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-138.138~22.04.1UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-138.138~22.04.1USN-8656-1
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-28.28~24.04.1UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-ibm5.15.0-1106.110UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-ibm6.8.0-1062.63UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-ibm6.8.0-1062.63USN-8630-1
Ubuntu:26.04:LTSlinux-ibm7.0.0-1010.10UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1062.63~22.04.1UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1062.63~22.04.1USN-8630-1
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1107.113UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-kvm5.15.0-1104.109UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-184.194UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-137.137.1UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-137.137.1USN-8630-2
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-137.137.1~22.04.1USN-8630-2
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-137.137.1~22.04.1UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1107.108UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1060.63USN-8630-1
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1060.63UBUNTU-CVE-2026-52931
Ubuntu:26.04:LTSlinux-nvidia7.0.0-1016.16UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-nvidia-6.176.17.0-1032.32USN-8748-1
Ubuntu:24.04:LTSlinux-nvidia-6.176.17.0-1032.32UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1060.63~22.04.1USN-8630-1
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1060.63~22.04.1UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-nvidia-7.07.0.0-1016.16~24.04.1UBUNTU-CVE-2026-52931
Ubuntu:26.04:LTSlinux-nvidia-bos7.0.0-2016.16UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1060.63.1USN-8630-1
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1060.63.1UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1064.66UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1031.32UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1031.32USN-8630-2
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1053.53UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-oem-6.176.17.0-1033.33UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-oem-6.176.17.0-1033.33USN-8911-1
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-52931
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1009.9UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-oracle5.15.0-1109.115UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-oracle6.8.0-1059.62USN-8630-2
Ubuntu:24.04:LTSlinux-oracle6.8.0-1059.62UBUNTU-CVE-2026-52931
Ubuntu:25.10linux-oracleno fix listedUBUNTU-CVE-2026-52931
Ubuntu:26.04:LTSlinux-oracle7.0.0-1008.8UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1059.62~22.04.1USN-8630-3
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1059.62~22.04.1UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-oracle-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-raspi5.15.0-1106.109UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-raspi6.8.0-1062.66UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-raspi6.8.0-1062.66USN-8630-5
Ubuntu:25.10linux-raspino fix listedUBUNTU-CVE-2026-52931
Ubuntu:26.04:LTSlinux-raspi7.0.0-1015.15UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-52931
Ubuntu:25.10linux-realtimeno fix listedUBUNTU-CVE-2026-52931
Ubuntu:26.04:LTSlinux-realtime7.0.0-28.28.1UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-52931
Ubuntu:25.10linux-riscvno fix listedUBUNTU-CVE-2026-52931
Ubuntu:26.04:LTSlinux-riscv7.0.0-28.28.1UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-137.137~22.04.1UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-28.28.1~24.04.3UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-vmware6.8.0-1008.8UBUNTU-CVE-2026-52931
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1034.35USN-8630-1
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1034.35UBUNTU-CVE-2026-52931
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1075.79UBUNTU-CVE-2026-52931

Affected products (as reported)

VendorProductVersions
Linux Linux 33a3bb4a3345bb511f9c69c913da95d4693e2a4e – before 0e388af04b3958b178a1b979527f93eb46ea1fee33a3bb4a3345bb511f9c69c913da95d4693e2a4e – before 1a21c055f66e78973712a4a1be2a554f1ee2e4f433a3bb4a3345bb511f9c69c913da95d4693e2a4e – before 9884c9c02d3c90e9215db3c5128f59045d20ae9133a3bb4a3345bb511f9c69c913da95d4693e2a4e – before 53f931e0146ae5bdab4cba302646827d06b3794b33a3bb4a3345bb511f9c69c913da95d4693e2a4e – before ecdaa3e4d91040206afe21bc8a0d1198a0971ff333a3bb4a3345bb511f9c69c913da95d4693e2a4e – before dc2ae5fbd2dadc26735092f140b246841d969a1133a3bb4a3345bb511f9c69c913da95d4693e2a4e – before 85397e48afe6be83ffca5ad3f4792296bfc81d3d33a3bb4a3345bb511f9c69c913da95d4693e2a4e – before 6c65cf23d4c6170fcf5714c32aa64689718cb142
Linux Linux 4.8

Weakness: CWE-457 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References