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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-52937

tap: fix stack info leak in tap_ioctl() SIOCGIFHWADDR

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 3b23a32a63219f51a5298bc55a65ecee866e79d0 to < 4b6dcfe0e3dfffd8057a4fc99b3f096c45709905affected
  • 3b23a32a63219f51a5298bc55a65ecee866e79d0 to < 37d028a473b0826ad5970b52b791db4a29a23627affected
  • 3b23a32a63219f51a5298bc55a65ecee866e79d0 to < 8197905d97099d8b1e3883112bbb497abd20f9f0affected
  • 3b23a32a63219f51a5298bc55a65ecee866e79d0 to < 719007c3492f0f1f9e9cdbed8ac45ba45bb13eebaffected
  • 3b23a32a63219f51a5298bc55a65ecee866e79d0 to < 05305e832be7b9d65b2b72caacf7d850b3942b2aaffected
  • 3b23a32a63219f51a5298bc55a65ecee866e79d0 to < bddc09212c24934643bd44fc794748d2bbb3b6cdaffected
  • 176188cff67ec1aa55103647b61d02315cc38e98affected
  • 1fc205d9e400f069ebf30d3faa6ec2bab2cbd7b4affected
  • 4d0ae760c02c98fc78b78d3a0509896bc648ad1caffected
  • 5.4.103 to < 5.5affected
  • 5.10.21 to < 5.11affected
  • 5.11.4 to < 5.12affected

Linux Linux

Default version status: affected

  • 5.12affected
  • 0 to < 5.12unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.114 to ≤ 6.12.*unaffected
  • 6.18.34 to ≤ 6.18.*unaffected
  • 7.0.11 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References