A vulnerability was found in Linux Kernel, an out-of-bounds read occurs when checking userspace params in drivers/media/dvb-frontends/cx24116.c. The maximum size for a DiSEqC command is 6, according to the userspace API. However, the code allows larger values such as 23. This was originally classfied as a buffer-overflow but it is not. It has been reclassified as a possible information leak. Reference: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1fa2337a315a2448c5434f41e00d56b01a22283c https://github.com/torvalds/linux/commit/1fa2337a315a2448c5434f41e00d56b01a22283c https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.1.4
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1735656]
This was fixed in stable kernel 4.1.4 and has never impacted any currently supported Fedora release.
Statement: This flaw requires a Conexant CX24116 series TV-media card to be in the system for this driver to load. This flaw is when an attacker attempts to use the card to communicate with a satellite tv control subsystem ( via Digital Satellite Equipment Control command) by issuing a specially crafted ioctl to the device.
This flaw is rated as moderate because this attack vector could allow a local attacker to leak kernel-internal information to userspace.
Note to any customers following along: I had originally misundertood this flaw, I apologise for any confusion. The impact and description has been modified to reflect my new understanding of this issue.
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2020:1016 https://access.redhat.com/errata/RHSA-2020:1016
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2020:1070 https://access.redhat.com/errata/RHSA-2020:1070
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2015-9289