Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 3b23a32a63219f51a5298bc55a65ecee866e79d0 before 37d028a473b0826ad5970b52b791db4a29a23627; affected 3b23a32a63219f51a5298bc55a65ecee866e79d0 before 8197905d97099d8b1e3883112bbb497abd20f9f0; affected 3b23a32a63219f51a5298bc55a65ecee866e79d0 before 719007c3492f0f1f9e9cdbed8ac45ba45bb13eeb; affected 3b23a32a63219f51a5298bc55a65ecee866e79d0 before 05305e832be7b9d65b2b72caacf7d850b3942b2a; affected 3b23a32a63219f51a5298bc55a65ecee866e79d0 before bddc09212c24934643bd44fc794748d2bbb3b6cd; affected 176188cff67ec1aa55103647b61d02315cc38e98; affected 1fc205d9e400f069ebf30d3faa6ec2bab2cbd7b4; affected 4d0ae760c02c98fc78b78d3a0509896bc648ad1c; affected 5.4.103 before 5.5; affected 5.10.21 before 5.11; affected 5.11.4 before 5.12 |
| Linux / Linux | affected 5.12; unaffected 0 before 5.12; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.34 through 6.18.*; unaffected 7.0.11 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/37d028a473b0826ad5970b52b791db4a29a23627
- https://git.kernel.org/stable/c/8197905d97099d8b1e3883112bbb497abd20f9f0
- https://git.kernel.org/stable/c/719007c3492f0f1f9e9cdbed8ac45ba45bb13eeb
- https://git.kernel.org/stable/c/05305e832be7b9d65b2b72caacf7d850b3942b2a
- https://git.kernel.org/stable/c/bddc09212c24934643bd44fc794748d2bbb3b6cd