CVE-2013-2596
Published on April 13, 2013
Integer overflow in the fb_mmap function in drivers/video/fbmem.c in the Linux kernel before 3.8.9, as used in a certain Motorola build of Android 4.1.2 and other products, allows local users to create a read-write memory mapping for the entirety of kernel memory, and consequently gain privileges, via crafted /dev/graphics/fb0 mmap2 system calls, as demonstrated by the Motochopper pwn program.
Known Exploited Vulnerability
This Linux Kernel Integer Overflow Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Linux kernel fb_mmap function in drivers/video/fbmem.c contains an integer overflow vulnerability which allows for privilege escalation.
The following remediation steps are recommended / required by October 6, 2022: Apply updates per vendor instructions.
Vulnerability Analysis
CVE-2013-2596 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.
Integer Overflow or Wraparound
The software performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. An integer overflow or wraparound occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may wrap to become a very small or negative number. While this may be intended behavior in circumstances that rely on wrapping, it can have security consequences if the wrap is unexpected. This is especially the case if the integer overflow can be triggered using user-supplied inputs. This becomes security-critical when the result is used to control looping, make a security decision, or determine the offset or size in behaviors such as memory allocation, copying, concatenation, etc.
Products Associated with CVE-2013-2596
You can be notified by stack.watch whenever vulnerabilities like CVE-2013-2596 are published in these products:
What versions are vulnerable to CVE-2013-2596?
Each of the following must match for the vulnerability to exist.