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CVE-2011-5321

20
FAUCET Score

CVE-2011-5321 is a denial-of-service vulnerability affecting the Linux kernel before version 3.1.1. It stems from improper handling of driver-lookup failures in the tty_open function, allowing local users to trigger a NULL pointer dereference and system crash through crafted access to /dev/pts device files. Rated Medium severity (CVSS 5.5), this vulnerability requires local access and can lead to a complete system compromise (Availability: High). There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.1CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.5MEDIUM

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.37%
Probability of exploitation in next 30 days
EPSS Percentile
29.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0037 is in the 85th percentile among its peer group of 15,940 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: kernel-0:2.6.32-504.30.3.el6
View patch
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2011-5321Moderate

Kernel: tty: driver reference leakage in tty_open

Oct 12, 2011

References

git.kernel.org / cgit/linux/kernel/git/torvalds/linux.git/commit
Vendor Advisory
rhn.redhat.com / errata/RHSA-2015-1221.html
bugzilla.redhat.com / show_bug.cgi
github.com / torvalds/linux/commit/c290f8358acaeffd8e0c551ddcc24d1206143376
Vendor Advisory
kernel.org / pub/linux/kernel/v3.x/ChangeLog-3.1.1
openwall.com / lists/oss-security/2015/03/13/17