CVE-2013-2596: Linux Kernel Integer Overflow Vulnerability

Q: How do I fix CVE-2013-2596?

linux kernel: upgrade to 3.0.75, 3.2.45, 3.4.42, 3.8.9; android: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2013-2596 being exploited?

Yes. CVE-2013-2596 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

Q: What does CVE-2013-2596 affect?

CVE-2013-2596 affects linux kernel, android. Severity is high (CVSS 7.8). 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 en

Q: How urgent is CVE-2013-2596?

Priority 84/100. High severity; Exploited in the wild (CISA KEV); Public exploit reference; On your watchlist

Patch now

HIGH 7.8EXPLOITEDWATCHLISTUPGRADEMITIGATE

CVE-2013-2596 is a high-severity flaw (CVSS 7.8) affecting linux kernel, android, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Exploited in the wild (CISA KEV)
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	3.2% (top 12%)
CISA exploited list	Yes, fix due 2022-10-06
Weakness	CWE-190
Published	2013-04-13
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: linux · motorola

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2013-04-13 02:59 UTCPublished CVE record published
2022-09-15Exploited Added to the CISA Known Exploited Vulnerabilities list
2022-10-06Deadline CISA due date for US federal agencies to patch
2026-06-16 23:53 UTCUpdated Record last modified

linux linux kernel UPGRADE

Affected: >= 2.6.12 and < 3.0.75 · >= 3.1 and < 3.2.45 · >= 3.3 and < 3.4.42 · >= 3.5 and < 3.8.9

Fixed in: 3.0.75, 3.2.45, 3.4.42, 3.8.9

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

motorola android MITIGATE

Affected: 4.1.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.1.2

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora ELN · makedumpfile · FIXED · 1.8.0-1.eln159 · FEDORA-2026-3bf4582b1f · source

sudo dnf upgrade --advisory=FEDORA-2026-3bf4582b1f

Fedora 46 · python-resend · FIXED · 2.50.1-1.fc46 · FEDORA-2026-8c29ba68cc · source

sudo dnf upgrade --advisory=FEDORA-2026-8c29ba68cc

Ubuntu 20.04 · linux · NOT AFFECTED

Ubuntu 20.04 · linux-aws · NOT AFFECTED

Ubuntu 20.04 · linux-azure · NOT AFFECTED

Ubuntu 20.04 · linux-gcp · NOT AFFECTED

Ubuntu 20.04 · linux-hwe-5.8 · NOT AFFECTED

Debian 12 · linux · FIXED · 3.9-1

sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "3.9-1" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · linux · FIXED · 3.9-1

sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "3.9-1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 5 · kernel · FIXED · kernel-2.6.18-409.el5

sudo dnf upgrade --advisory=RHSA-2016:0450 rpm -q kernel

RHEL 6 · kernel · FIXED · kernel-2.6.32-504.el6

sudo dnf upgrade --advisory=RHSA-2014:1392 rpm -q kernel

RHEL 6.2 Advanced Update Support · kernel · FIXED · kernel-2.6.32-220.60.2.el6

sudo dnf upgrade --advisory=RHSA-2015:0695 rpm -q kernel

RHEL 6.4 Advanced Update Support · kernel · FIXED · kernel-2.6.32-358.59.1.el6

sudo dnf upgrade --advisory=RHSA-2015:0803 rpm -q kernel

RHEL 6.5 Extended Update Support · kernel · FIXED · kernel-2.6.32-431.53.2.el6

sudo dnf upgrade --advisory=RHSA-2015:0782 rpm -q kernel

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: hiikezoe/libfb_mem_exploit (6 stars)

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2013-2596?

linux kernel: upgrade to 3.0.75, 3.2.45, 3.4.42, 3.8.9; android: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2013-2596 being exploited?

Yes. CVE-2013-2596 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2013-2596 affect?

CVE-2013-2596 affects linux kernel, android. Severity is high (CVSS 7.8). 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 en

How urgent is CVE-2013-2596?

Priority 84/100. High severity; Exploited in the wild (CISA KEV); Public exploit reference; On your watchlist

Software pages

Linux kernel vulnerabilities · Android vulnerabilities

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References

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