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

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

https://cvefeed.io/rssfeed/latest.atom / Wed, 06/24/2026 - 13:01
CVE ID :CVE-2026-52937
Published : June 24, 2026, 7:14 a.m. | 2 hours, 26 minutes ago
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.
Severity: 0.0 | NA
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