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CVE-2012-4565

19
FAUCET Score

CVE-2012-4565 describes a denial-of-service vulnerability in the Linux kernel, specifically within the tcp_illinois_info function when the Illinois congestion control setting is enabled. A local attacker can trigger a divide-by-zero error and system crash (OOPS) by reading TCP statistics. This vulnerability has a CVSS score of 4.7, indicating a medium severity, and requires local access with medium attack complexity to achieve a complete loss of availability. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.4.18CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
3.4.1CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:3.4.1:*:*:*:*:*:*:*
3.4.2CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:3.4.2:*:*:*:*:*:*:*
3.4.3CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:3.4.3:*:*:*:*:*:*:*
3.4.4CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:3.4.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.7MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
LOCAL
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
3.4
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
0.49%
Probability of exploitation in next 30 days
EPSS Percentile
39.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0049 is in the 75th percentile among its peer group of 1,595 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 0.0 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-0:2.6.32-279.19.1.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise MRG 2Fixed in: kernel-rt-0:3.2.33-rt50.66.el6rt
View patch

Vendor Advisories (1)

redhatCVE-2012-4565Moderate

kernel: net: divide by zero in tcp algorithm illinois

Oct 31, 2012

References

git.kernel.org
lists.fedoraproject.org / pipermail/package-announce/2012-November/091110.html
rhn.redhat.com / errata/RHSA-2012-1580.html
bugzilla.redhat.com / show_bug.cgi
secunia.com / advisories/51409
github.com / torvalds/linux/commit/8f363b77ee4fbf7c3bbcf5ec2c5ca482d396d664
Exploit
kernel.org / pub/linux/kernel/v3.x/ChangeLog-3.4.19
openwall.com / lists/oss-security/2012/10/31/5
securityfocus.com / bid/56346
ubuntu.com / usn/USN-1644-1
ubuntu.com / usn/USN-1645-1
ubuntu.com / usn/USN-1646-1
ubuntu.com / usn/USN-1647-1
ubuntu.com / usn/USN-1648-1
ubuntu.com / usn/USN-1649-1
ubuntu.com / usn/USN-1650-1
ubuntu.com / usn/USN-1651-1
ubuntu.com / usn/USN-1652-1