CVE-2016-4805

Use-after-free vulnerability in drivers/net/ppp/ppp_generic.c in the Linux kernel before 4.5.2 allows local users to cause a denial of service (memory corruption and system crash, or spinlock) or possibly have unspecified other impact by removing a network namespace, related to the ppp_register_net_channel and ppp_unregister_channel functions.

Published: 2016-05-23 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-4805 is rated Moderate Risk (44.7/100): CVSS High severity, with low exploitation likelihood (EPSS 0.48%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2016-4805

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.12% 0.48% +0.36%
2 2025-03-30 0.45% 0.12% -0.33%
3 2025-03-29 — 0.45% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-4805

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
7.2 2.0 HIGH
AV:L/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 3.9 10.0 [email protected]

Weakness enumeration for CVE-2016-4805

OS Trackers for CVE-2016-4805

vendor priority summary link
debian not yet assigned CVE-2016-4805 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2016-4805
redhat low — https://access.redhat.com/security/cve/CVE-2016-4805
suse low CVE-2016-4805 severity low: SUSE including 168 source package names (kernel-bigsmp-3.0.101-0.47.86.1, kernel-bigsmp-base-3.0.101-0.47.86.1, …), 319 product×package rows across 35 product lines (SUSE Linux Enterprise Desktop 12, SUSE Linux Enterprise Desktop 12 SP1, … (35 product lines)): Fixed 313, Known Not Affected 6. https://www.suse.com/security/cve/CVE-2016-4805/
ubuntu medium CVE-2016-4805 medium priority: Ubuntu including 27 source packages (linux, linux-armadaxp, …), 185 status rows across 7 suites (precise, trusty, upstream, wily, xenial, yakkety, zesty): DNE 119, released 40, ignored 15, not-affected 11. https://ubuntu.com/security/CVE-2016-4805

Affected software / configurations for CVE-2016-4805

Vendor Product Version Raw CPE
novell suse_linux_enterprise_desktop 12.0 cpe:2.3:o:novell:suse_linux_enterprise_desktop:12.0:-:*:*:*:*:*:*
novell suse_linux_enterprise_workstation_extension 12.0 cpe:2.3:a:novell:suse_linux_enterprise_workstation_extension:12.0:-:*:*:*:*:*:*
novell suse_linux_enterprise_module_for_public_cloud 12.0 cpe:2.3:a:novell:suse_linux_enterprise_module_for_public_cloud:12.0:-:*:*:*:*:*:*
novell suse_linux_enterprise_server 11.0 cpe:2.3:o:novell:suse_linux_enterprise_server:11.0:sp4:*:*:*:*:*:*
novell opensuse_leap 42.1 cpe:2.3:o:novell:opensuse_leap:42.1:*:*:*:*:*:*:*
novell suse_linux_enterprise_software_development_kit 11.0 cpe:2.3:a:novell:suse_linux_enterprise_software_development_kit:11.0:sp4:*:*:*:*:*:*
redhat enterprise_linux 6.0 cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
canonical ubuntu_linux 12.04 cpe:2.3:o:canonical:ubuntu_linux:12.04:-:lts:*:*:*:*:*
linux linux_kernel >= 2.6.30, < 3.2.80 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 3.3, < 3.10.102 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 3.11, < 3.12.59 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 3.13, < 3.14.67 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 3.15, < 3.16.35 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 3.17, < 3.18.37 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 3.19, < 4.1.28 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 4.2, < 4.4.8 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 4.5, < 4.5.2 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
novell suse_linux_enterprise_software_development_kit 12.0 cpe:2.3:a:novell:suse_linux_enterprise_software_development_kit:12.0:-:*:*:*:*:*:*
novell suse_linux_enterprise_workstation_extension 12.0 cpe:2.3:a:novell:suse_linux_enterprise_workstation_extension:12.0:sp1:*:*:*:*:*:*
novell suse_linux_enterprise_server 12.0 cpe:2.3:o:novell:suse_linux_enterprise_server:12.0:-:*:*:*:*:*:*
novell suse_linux_enterprise_desktop 12.0 cpe:2.3:o:novell:suse_linux_enterprise_desktop:12.0:sp1:*:*:*:*:*:*
redhat enterprise_linux 7.0 cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
oracle linux 6 cpe:2.3:o:oracle:linux:6:*:*:*:*:*:*:*
novell suse_linux_enterprise_real_time_extension 11.0 cpe:2.3:o:novell:suse_linux_enterprise_real_time_extension:11.0:sp4:*:*:*:*:*:*
novell suse_linux_enterprise_server 12.0 cpe:2.3:o:novell:suse_linux_enterprise_server:12.0:sp1:*:*:*:*:*:*
novell suse_linux_enterprise_real_time_extension 12.0 cpe:2.3:o:novell:suse_linux_enterprise_real_time_extension:12.0:sp1:*:*:*:*:*:*
novell suse_linux_enterprise_software_development_kit 12.0 cpe:2.3:a:novell:suse_linux_enterprise_software_development_kit:12.0:sp1:*:*:*:*:*:*
novell suse_linux_enterprise_live_patching 12.0 cpe:2.3:a:novell:suse_linux_enterprise_live_patching:12.0:-:*:*:*:*:*:*

References for CVE-2016-4805

URL Tags
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1f461dcdd296eecedaffffc6bae2bfa90bd7eb89 Patch Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00044.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00052.html Mailing List Release Notes Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00054.html Mailing List Release Notes Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00000.html Mailing List Release Notes Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00007.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00044.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00055.html Mailing List Third Party Advisory
http://www.debian.org/security/2016/dsa-3607 Third Party Advisory
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.5.2 Mailing List Vendor Advisory
http://www.openwall.com/lists/oss-security/2016/05/15/2 Mailing List Patch Third Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html Third Party Advisory
http://www.oracle.com/technetwork/topics/security/ovmbulletinoct2016-3090547.html Third Party Advisory
http://www.securityfocus.com/bid/90605 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1036763 Third Party Advisory VDB Entry
http://www.ubuntu.com/usn/USN-3021-1 Third Party Advisory
http://www.ubuntu.com/usn/USN-3021-2 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1335803 Issue Tracking Third Party Advisory
https://github.com/torvalds/linux/commit/1f461dcdd296eecedaffffc6bae2bfa90bd7eb89 Patch Third Party Advisory
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