CVE-2013-2596 — Linux Kernel Integer Overflow Vulnerability

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 consequentl

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2022-09-15. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2013-04-13T01:00:00.000Z
• Last modified: 2025-10-22T00:05:43.277Z
• Added to CISA KEV: 2022-09-15
• BOD 22-01 due: 2022-10-06

09References

• rhn.redhat.com — http://rhn.redhat.com/errata/RHSA-2015-0695.html
• www.securityfocus.com — http://www.securityfocus.com/bid/59264
• www.droid-life.com — http://www.droid-life.com/2013/04/09/root-method-released-for-droid-razr-hd-runn…
• www.mandriva.com — http://www.mandriva.com/security/advisories?name=MDVSA-2013:176
• marc.info — http://marc.info/?l=linux-kernel&m=136616837923938&w=2
• github.com — https://github.com/torvalds/linux/commit/b4cbb197c7e7a68dbad0d491242e3ca67420c13…
• www.oracle.com — http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.h…
• git.kernel.org — http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=…
• rhn.redhat.com — http://rhn.redhat.com/errata/RHSA-2015-0803.html
• forum.xda-developers.com — http://forum.xda-developers.com/showthread.php?t=2255491
• www.droidrzr.com — http://www.droidrzr.com/index.php/topic/15208-root-motochopper-yet-another-andro…
• www.kernel.org — http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.8.9
• rhn.redhat.com — http://rhn.redhat.com/errata/RHSA-2015-0782.html
• kb.juniper.net — http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10761
• github.com — https://github.com/torvalds/linux/commit/fc9bbca8f650e5f738af8806317c0a041a48ae4…
• git.kernel.org — http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=…