The ipxitf_ioctl function in net/ipx/af_ipx.c in the Linux kernel through 4.11.1 mishandles reference counts, which allows local users to cause a denial of service (use-after-free) or possibly have unspecified other impact via a failed SIOCGIFADDR ioctl call for an IPX interface.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
| Link | Tags |
|---|---|
| http://www.securitytracker.com/id/1039237 | third party advisory vdb entry |
| https://github.com/torvalds/linux/commit/ee0d8d8482345ff97a75a7d747efc309f13b0d80 | patch vendor advisory issue tracking |
| https://source.android.com/security/bulletin/2017-09-01 | third party advisory |
| https://patchwork.ozlabs.org/patch/757549/ | patch |
| http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ee0d8d8482345ff97a75a7d747efc309f13b0d80 | patch |
| http://www.securityfocus.com/bid/98439 | third party advisory vdb entry |
| http://www.debian.org/security/2017/dsa-3886 | third party advisory vendor advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=1447734 | patch issue tracking |