PT-2026-51730 · Linux · Linux
Published
2026-06-24
·
Updated
2026-06-24
·
CVE-2026-52937
None
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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.
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Related Identifiers
Affected Products
Linux