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tap: fix stack info leak in tap_ioctl() SIOCGIFHWADDR

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 products

Linux
  • =<6.18.*
  • <bddc09212c24934643bd44fc794748d2bbb3b6cd
  • <5.5
  • <5.11
  • ==1fc205d9e400f069ebf30d3faa6ec2bab2cbd7b4
  • ==5.12
  • =<7.0.*
  • <5.12
  • <5.12
  • <719007c3492f0f1f9e9cdbed8ac45ba45bb13eeb
  • =<*
  • ==176188cff67ec1aa55103647b61d02315cc38e98
  • <05305e832be7b9d65b2b72caacf7d850b3942b2a
  • ==4d0ae760c02c98fc78b78d3a0509896bc648ad1c