CVE-2013-2596: Linux Kernel Integer Overflow Vulnerability

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: yes — in CISA KEV since 2022-09-15
EPSS: 3.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2013-04-13 · updated 2026-06-16
Weakness: CWE-190

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.

Affected products

Linux kernel: from 2.6.12 before 3.0.75; from 3.1 before 3.2.45; from 3.3 before 3.4.42; from 3.5 before 3.8.9 — fixed in 3.0.75, 3.2.45, 3.4.42, 3.8.9
Motorola Android: 4.1.2

How to fix

Upgrade to a fixed version: Linux kernel 3.0.75, 3.2.45, 3.4.42, 3.8.9. Check the vendor advisory for mitigations.

References

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