CVE-2016-3707 [High] | Security Vulnerability in Linux Kernel-Rt

The icmp_check_sysrq function in net/ipv4/icmp.c in the kernel.org projects/rt patches for the Linux kernel, as used in the kernel-rt package before 3.10.0-327.22.1 in Red Hat Enterprise Linux for Real Time 7 and other products, allows remote attackers to execute SysRq commands via crafted ICMP Echo Request packets, as demonstrated by a brute-force attack to discover a cookie, or an attack that occurs after reading the local icmp_echo_sysrq file.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	1.79%	3.39%	+1.60%
2	2025-08-26	1.87%	1.79%	-0.09%
3	2025-03-30	—	1.87%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

1.79%

3.39%

+1.60%

2025-08-26

1.87%

1.79%

-0.09%

2025-03-30

—

1.87%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.1	3.0	HIGH	`CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. 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.	2.2	5.9	[email protected]
6.8	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:P/I:P/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	8.6	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

8.1

3.0

HIGH

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
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.

2.2

5.9

[email protected]

6.8

2.0

MEDIUM

AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

8.6

6.4

[email protected]

OS Trackers for CVE-2016-3707

vendor	priority	summary	link
`debian`	unimportant	CVE-2016-3707 unimportant 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-2016-3707
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2016-3707
`ubuntu`	medium	CVE-2016-3707 medium priority: Ubuntu including 31 source packages (linux, linux-aws, …), 186 status rows across 6 suites (bionic, eoan, focal, trusty, upstream, xenial): DNE 95, not-affected 91.	https://ubuntu.com/security/CVE-2016-3707

Affected software / configurations for CVE-2016-3707

Vendor	Product	Version	Raw CPE
linux	linux_kernel-rt	<= 3.10.0	cpe:2.3:o:linux:linux_kernel-rt::::::::
redhat	enterprise_linux_for_real_time	7	cpe:2.3:o:redhat:enterprise_linux_for_real_time:7:::::::*
redhat	enterprise_linux_for_real_time_for_nfv	7	cpe:2.3:o:redhat:enterprise_linux_for_real_time_for_nfv:7:::::::*
novell	suse_linux_enterprise_real_time_extension	12.0	cpe:2.3:o:novell:suse_linux_enterprise_real_time_extension:12.0:sp1::::::

References for CVE-2016-3707

URL	Tags
http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00005.html	Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00000.html	Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00007.html
http://www.openwall.com/lists/oss-security/2016/05/17/1
https://access.redhat.com/errata/RHSA-2016:1301	Third Party Advisory
https://access.redhat.com/errata/RHSA-2016:1341	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1327484	Issue Tracking

URL

CVE-2016-3707

Exploit prediction scoring system (EPSS) score for CVE-2016-3707

Common vulnerability scoring system (CVSS) metrics for CVE-2016-3707

Weakness enumeration for CVE-2016-3707

OS Trackers for CVE-2016-3707

Affected software / configurations for CVE-2016-3707

References for CVE-2016-3707