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CVE-2011-1171

14
FAUCET Score

CVE-2011-1171 is a vulnerability in the IPv4 implementation of the Linux kernel (before version 2.6.39) where a missing null terminator in string data within net/ipv4/netfilter/ip_tables.c allows local users to potentially extract sensitive information from kernel memory. This flaw requires the CAP_NET_ADMIN capability to trigger a crafted request, leading to information disclosure through the modprobe process. The vulnerability has a low severity CVSS score of 2.1 (AV:L/AC:L/Au:N/C:P/I:N/A:N), indicating local access and low attack complexity are needed for a partial confidentiality impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.6.38.8CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
2.6.0CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:2.6.0:*:*:*:*:*:*:*
2.6.1CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:2.6.1:*:*:*:*:*:*:*
2.6.1CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:2.6.1:rc1:*:*:*:*:*:*
2.6.1CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:2.6.1:rc2:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

2.1LOW

AV:L/AC:L/Au:N/C:P/I:N/A:N

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Exploitability Score
3.9
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
0.39%
Probability of exploitation in next 30 days
EPSS Percentile
31.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0039 is in the 52nd percentile among its peer group of 2,096 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.6 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (5)

redhatpatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: MRG for RHEL-5Fixed in: kernel-rt-0:2.6.33.9-rt31.64.el5rt
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: kernel-0:2.6.18-238.12.1.el5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: kernel-0:2.6.32-131.0.15.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.0 EUS - Server OnlyFixed in: kernel-0:2.6.32-71.31.1.el6
View patch

Vendor Advisories (1)

redhatCVE-2011-1171Low

kernel: ipv4: netfilter: ip_tables: fix infoleak to userspace

Mar 10, 2011

References

downloads.avaya.com / css/P8/documents/100145416
git.kernel.org
marc.info
Patch
rhn.redhat.com / errata/RHSA-2011-0833.html
bugzilla.redhat.com / show_bug.cgi
Patch
securityreason.com / securityalert/8278
securityreason.com / securityalert/8283
kernel.org / pub/linux/kernel/v2.6/ChangeLog-2.6.39
openwall.com / lists/oss-security/2011/03/18/15
Patch
openwall.com / lists/oss-security/2011/03/21/1
Patch
openwall.com / lists/oss-security/2011/03/21/4
Patch