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CVE-2011-4326

24
FAUCET Score

CVE-2011-4326 describes a denial-of-service vulnerability in the Linux kernel, specifically affecting versions prior to 2.6.39. This flaw, residing in the udp6_ufo_fragment function, allows remote attackers to crash a system by sending specially crafted fragmented IPv6 UDP packets to a bridge device when UDP Fragmentation Offload (UFO) is enabled. With a CVSS score of 7.1, this vulnerability is considered high severity due to its network-based attack vector, medium attack complexity, and complete availability impact. There is no evidence of active exploitation, nor are there known public exploits or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.6.39CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 6.0.0, <= 6.6.0CPE matchmatch criteria
cpe:2.3:o:avaya:96x1_ip_deskphone_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.1HIGH

AV:N/AC:M/Au:N/C:N/I:N/A:C

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.21%
Probability of exploitation in next 30 days
EPSS Percentile
86.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0321 is in the 46th percentile among its peer group of 8,918 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 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 (3)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: kernel-0:2.6.32-131.21.1.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise MRG 2Fixed in: kernel-rt-0:2.6.33.9-rt31.79.el6rt
View patch

Vendor Advisories (1)

redhatCVE-2011-4326Important

kernel: wrong headroom check in udp6_ufo_fragment()

Mar 3, 2011

References

downloads.avaya.com / css/P8/documents/100156038
Third Party Advisory
ftp.osuosl.org / pub/linux/kernel/v2.6/ChangeLog-2.6.39
Broken Link
git.kernel.org
bugzilla.redhat.com / show_bug.cgi
ExploitIssue TrackingThird Party Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party Advisory
github.com / torvalds/linux/commit/a9cf73ea7ff78f52662c8658d93c226effbbedde
PatchThird Party Advisory
openwall.com / lists/oss-security/2011/11/21/10
Mailing List
securityfocus.com / bid/50751
Third Party AdvisoryVDB Entry