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CVE-2016-4580

24
FAUCET Score

CVE-2016-4580 describes an information disclosure vulnerability in the Linux kernel's x25_negotiate_facilities function (net/x25/x25_facilities.c) before version 4.5.5, affecting various Linux distributions including Canonical and Ubuntu. This flaw allows remote attackers to obtain sensitive kernel stack memory information via a crafted X.25 Call Request due to improper data structure initialization. Rated 7.5 HIGH on CVSSv3, it has a network attack vector and low attack complexity, but no integrity or availability impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.5.4CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
12.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
15.10CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:15.10:*:*:*:*:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.18%
Probability of exploitation in next 30 days
EPSS Percentile
89.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0418 is in the 82nd percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 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

Vendor Patches (6)

github_advisoryvendor investigatingvia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: kernel
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: kernel
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-rt
redhatend of lifevia redhat_api
Product: Red Hat Enterprise MRG 2Fixed in: realtime-kernel

Vendor Advisories (1)

redhatCVE-2016-4580Low

kernel: Information leak in x25 module

May 8, 2016

References

git.kernel.org / cgit/linux/kernel/git/torvalds/linux.git/commit
Vendor Advisory
lists.opensuse.org / opensuse-security-announce/2016-06/msg00044.html
lists.opensuse.org / opensuse-security-announce/2016-06/msg00052.html
lists.opensuse.org / opensuse-security-announce/2016-08/msg00007.html
github.com / torvalds/linux/commit/79e48650320e6fba48369fccf13fd045315b19b8
Vendor Advisory
debian.org / security/2016/dsa-3607
kernel.org / pub/linux/kernel/v4.x/ChangeLog-4.5.5
openwall.com / lists/oss-security/2016/05/10/12
securityfocus.com / bid/90528
ubuntu.com / usn/USN-3016-1
ubuntu.com / usn/USN-3016-2
ubuntu.com / usn/USN-3016-3
ubuntu.com / usn/USN-3016-4
ubuntu.com / usn/USN-3017-1
ubuntu.com / usn/USN-3017-2
ubuntu.com / usn/USN-3017-3
ubuntu.com / usn/USN-3018-1
ubuntu.com / usn/USN-3018-2
ubuntu.com / usn/USN-3019-1
ubuntu.com / usn/USN-3020-1
ubuntu.com / usn/USN-3021-1
ubuntu.com / usn/USN-3021-2