CVE-2014-8102: The SProcXFixesSelectSelectionInput function in the XFixes extension in X.Org X Window System (aka X11 or X) X

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MEDIUM 6.5WATCHLISTUPGRADEDOWNGRADEMITIGATE

CVE-2014-8102 is a medium-severity flaw (CVSS 6.5) affecting x server, x11, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The SProcXFixesSelectSelectionInput function in the XFixes extension in X.Org X Window System (aka X11 or X) X11R6.8.0 and X.Org Server (aka xserver and xorg-server) before 1.16.3 allows remote authenticated users to cause a denial of service (out-of-bounds read or write) or possibly execute arbitrary code via a crafted length value.

Why this priority

EPSS top 9%: very likely to be exploited
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
EPSS exploit chance	4.4% (top 9%)
CISA exploited list	No
Weakness	CWE-119
Published	2014-12-10
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: debian · x.org

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2014-12-10 15:59 UTCPublished CVE record published
2026-06-17 00:16 UTCUpdated Record last modified

x.org x server UPGRADE

Affected: <= 1.16.2.99.901

Fixed in: newer than 1.16.2.99.901

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy x-server || rpm -q x-server || x-server --version

2. UPGRADE to newer than 1.16.2.99.901 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade x-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade x-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

x.org x11 DOWNGRADE

Affected: 6.8

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.8

1. Check installed version

apt-cache policy x11 || rpm -q x11 || x11 --version

2. No fixed release: DOWNGRADE to a release before 6.8 (Debian / Ubuntu)

apt-cache madison x11 sudo apt install x11=<VERSION_BEFORE_6.8> sudo apt-mark hold x11

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list x11 sudo dnf downgrade x11-<VERSION_BEFORE_6.8> sudo dnf versionlock add x11

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

debian debian linux MITIGATE

Affected: 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0

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.

Verify at the official source NVD · CVE Program · 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-2014-8102?

x server: upgrade to newer than 1.16.2.99.901; x11: downgrade or apply the listed mitigation; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2014-8102 being exploited?

CVE-2014-8102 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2014-8102 affect?

CVE-2014-8102 affects x server, x11, debian linux. Severity is medium (CVSS 6.5). The SProcXFixesSelectSelectionInput function in the XFixes extension in X.Org X Window System (aka X11 or X) X11R6.8.0 and X.Org Server (aka xserver and xorg-server) before 1.16.3 allows remote authenticated users to cause a denial of servi

How urgent is CVE-2014-8102?

Priority 51/100. EPSS top 9%: very likely to be exploited; On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2026-34000 MEDIUM 6.1 MITIGATE MITIGATE A flaw was found in the X.Org X server
CVE-2026-34002 MEDIUM 6.1 MITIGATE MITIGATE A flaw was found in the X.Org X server
CVE-2026-50261 HIGH 7.8 UPGRADE UPGRADE A use-after-free flaw was found in the X.Org X server and Xwayland in SyncChangeCounter()
CVE-2026-50260 HIGH 7.8 UPGRADE UPGRADE A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter()
CVE-2026-50259 HIGH 7.8 UPGRADE UPGRADE A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland

References

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