CVE-2026-52937
tap: fix stack info leak in tap_ioctl() SIOCGIFHWADDR
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Jun 24, 2026 |
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Affected Versions
Linux / Linux
3b23a32a63219f51a5298bc55a65ecee866e79d0 < 719007c3492f0f1f9e9cdbed8ac45ba45bb13eeb 3b23a32a63219f51a5298bc55a65ecee866e79d0 < 05305e832be7b9d65b2b72caacf7d850b3942b2a 3b23a32a63219f51a5298bc55a65ecee866e79d0 < bddc09212c24934643bd44fc794748d2bbb3b6cd 176188cff67ec1aa55103647b61d02315cc38e98 1fc205d9e400f069ebf30d3faa6ec2bab2cbd7b4 4d0ae760c02c98fc78b78d3a0509896bc648ad1c 5.4.103 < 5.5 5.10.21 < 5.11 5.11.4 < 5.12
Linux / Linux
5.12