CVE-2013-2596: Linux Kernel Integer Overflow Vulnerability

Vulnerability summary

CVE-2013-2596 is a high (CVSS 7.8) Integer Overflow or Wraparound vulnerability in Linux Kernel. It is known to be exploited: CISA lists it, first on 15-09-2022. EPSS estimates a 3.21% chance of exploitation in the next 30 days, higher than 88.2% of scored vulnerabilities. 4 public exploits are recorded.

Timeline

1. 13-04-2013
   PublishedVulnerability first disclosed.
2. 15-09-2022
   Added to CISA KEVExploitedLinux Kernel Integer Overflow Vulnerability
3. 06-10-2022
   CISA remediation dueDeadline passedApply updates per vendor instructions.
4. 22-10-2025
   Last modifiedVulnerability information updated.

Description

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.

• CWE-190Integer Overflow or WraparoundThe product 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 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 become a very small or negative number.