PT-2026-51730 · Linux · Linux

Publicado 2026-06-24 · Atualizado 2026-06-24 · CVE-2026-52937

Mitre

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.

Identificadores relacionados

CVE-2026-52937

Produtos afetados

Linux

Referências · 4

• https://git.kernel.org/stable/c/05305e832be7b9d65b2b72caacf7d850b3942b2a · Nota
• https://nvd.nist.gov/vuln/detail/CVE-2026-52937 · Nota de Segurança
• https://git.kernel.org/stable/c/719007c3492f0f1f9e9cdbed8ac45ba45bb13eeb · Nota
• https://git.kernel.org/stable/c/bddc09212c24934643bd44fc794748d2bbb3b6cd · Nota