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Vulnerability · Published Jun 24, 2026 · Assigned by Linux

CVE-2026-52937tap: fix stack info leak in tap_ioctl() SIOCGIFHWADDR

Medium 5.5

In plain English

A medium-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 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.1%top 98.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: tap: fix stack info leak in tap_ioctl() SIOCGIFHWADDR In the SIOCGIFHWADDR path, tap_ioctl() copies 16 bytes of an uninitialised on-stack struct sockaddr_storage to userspace via ifr_hwaddr, but netif_get_mac_address() only writes sa_family and dev->addr_len (6 for Ethernet) bytes, leaving sa_data[6..13] uninitialised. Those 8 trailing bytes leak kernel stack contents; SIOCGIFHWADDR on a macvtap chardev returns kernel .text and direct-map pointers, defeating KASLR. Initialise ss at declaration.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2026-52937
Debian:13linux6.12.115-2DEBIAN-CVE-2026-52937
Debian:14linux7.0.12-1DEBIAN-CVE-2026-52937
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-52937
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2026-52937
Ubuntu:26.04:LTSlinux7.0.0-28.28UBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-52937
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2026-52937
Ubuntu:26.04:LTSlinux-aws7.0.0-1009.9UBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-52937
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2026-52937
Ubuntu:26.04:LTSlinux-azure7.0.0-1010.10UBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-azure-7.07.0.0-1014.14~24.04.1UBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-52937
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-52937
Ubuntu:26.04:LTSlinux-azure-fde7.0.0-1009.9UBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-azure-fde-7.07.0.0-1013.13~24.04.1UBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-52937
Ubuntu:25.10linux-gcpno fix listedUBUNTU-CVE-2026-52937
Ubuntu:26.04:LTSlinux-gcp7.0.0-1008.8UBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-gcp-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-52937
Ubuntu:26.04:LTSlinux-gke7.0.0-1003.4UBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-28.28~24.04.1UBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-52937
Ubuntu:26.04:LTSlinux-ibm7.0.0-1010.10UBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-52937
Ubuntu:26.04:LTSlinux-nvidia7.0.0-1016.16UBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-nvidia-7.07.0.0-1016.16~24.04.1UBUNTU-CVE-2026-52937
Ubuntu:26.04:LTSlinux-nvidia-bos7.0.0-2016.16UBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-52937
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1009.9UBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-52937
Ubuntu:25.10linux-oracleno fix listedUBUNTU-CVE-2026-52937
Ubuntu:26.04:LTSlinux-oracle7.0.0-1008.8UBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-oracle-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-52937
Ubuntu:25.10linux-raspino fix listedUBUNTU-CVE-2026-52937
Ubuntu:26.04:LTSlinux-raspi7.0.0-1015.15UBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-52937
Ubuntu:25.10linux-realtimeno fix listedUBUNTU-CVE-2026-52937
Ubuntu:26.04:LTSlinux-realtime7.0.0-28.28.1UBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-52937
Ubuntu:25.10linux-riscvno fix listedUBUNTU-CVE-2026-52937
Ubuntu:26.04:LTSlinux-riscv7.0.0-28.28.1UBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-28.28.1~24.04.3UBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-52937
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-52937
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-52937

Affected products (as reported)

VendorProductVersions
Linux Linux 3b23a32a63219f51a5298bc55a65ecee866e79d0 – before 4b6dcfe0e3dfffd8057a4fc99b3f096c457099053b23a32a63219f51a5298bc55a65ecee866e79d0 – before 37d028a473b0826ad5970b52b791db4a29a236273b23a32a63219f51a5298bc55a65ecee866e79d0 – before 8197905d97099d8b1e3883112bbb497abd20f9f03b23a32a63219f51a5298bc55a65ecee866e79d0 – before 719007c3492f0f1f9e9cdbed8ac45ba45bb13eeb3b23a32a63219f51a5298bc55a65ecee866e79d0 – before 05305e832be7b9d65b2b72caacf7d850b3942b2a3b23a32a63219f51a5298bc55a65ecee866e79d0 – before bddc09212c24934643bd44fc794748d2bbb3b6cd176188cff67ec1aa55103647b61d02315cc38e981fc205d9e400f069ebf30d3faa6ec2bab2cbd7b4
Linux Linux 5.12

References