CVE-2026-31416 [Medium] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_log: account for netlink header size This is a followup to an old bug fix: NLMSG_DONE needs to account for the netlink header size, not just the attribute size. This can result in a WARN splat + drop of the netlink message, but other than this there are no ill effects.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-04-14	—	0.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-04-14

—

0.02%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.5	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.5

3.1

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

3.6

[email protected]

OS Trackers for CVE-2026-31416

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2026-31416 not yet assigned priority: Debian including 2 source packages (linux, linux-6.1), 6 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 6.	https://security-tracker.debian.org/tracker/CVE-2026-31416
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2026-31416
`suse`	low	CVE-2026-31416 severity low: SUSE including 4 source package names (kernel-default, kernel-default-base, kernel-default-devel, kernel-source), 4 product×package rows across 1 product lines (SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE): Known Not Affected 4.	https://www.suse.com/security/cve/CVE-2026-31416/
`ubuntu`	medium	CVE-2026-31416 medium priority: Ubuntu including 161 source packages (linux, linux-allwinner-5.19, …), 1449 status rows across 9 suites (bionic, focal, jammy, noble, questing, resolute, trusty, upstream, xenial): DNE 1047, ignored 172, needed 129, released 84, not-affected 13, needs-triage 4.	https://ubuntu.com/security/CVE-2026-31416

Affected software / configurations for CVE-2026-31416

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 3.10.61, < 3.11	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 3.12.34, < 3.13	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 3.14.25, < 3.15	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 3.18, < 5.10.253	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.203	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 6.1.168	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.2, < 6.6.134	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.7, < 6.12.81	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.13, < 6.18.22	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.19, < 6.19.12	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	7.0	cpe:2.3:o:linux:linux_kernel:7.0:rc1::::::
linux	linux_kernel	7.0	cpe:2.3:o:linux:linux_kernel:7.0:rc2::::::
linux	linux_kernel	7.0	cpe:2.3:o:linux:linux_kernel:7.0:rc3::::::
linux	linux_kernel	7.0	cpe:2.3:o:linux:linux_kernel:7.0:rc4::::::
linux	linux_kernel	7.0	cpe:2.3:o:linux:linux_kernel:7.0:rc5::::::
linux	linux_kernel	7.0	cpe:2.3:o:linux:linux_kernel:7.0:rc6::::::
linux	linux_kernel	7.0	cpe:2.3:o:linux:linux_kernel:7.0:rc7::::::

References for CVE-2026-31416

URL	Tags
https://git.kernel.org/stable/c/09883bf257f4243ed5a1fd35078ec6f0d0f3696a	Patch
https://git.kernel.org/stable/c/4ec216410fac9de83c99177a160ebb8d42fad075	Patch
https://git.kernel.org/stable/c/607245c4dbb86d9a10dd8388da0fb82170a99b61	Patch
https://git.kernel.org/stable/c/6b419700e459fbf707ca1543b7c1b57a60fedb73	Patch
https://git.kernel.org/stable/c/6d52a4a0520a6696bdde51caa11f2d6821cd0c01	Patch
https://git.kernel.org/stable/c/761b45c661af48da6a065868d59ab1e1f64fd9b6	Patch
https://git.kernel.org/stable/c/88a8f56e6276f616baad4274c6b8e4683e26e520	Patch
https://git.kernel.org/stable/c/f08ffa3e1c8e36b6131f69c5eb23700c28cbd262	Patch

URL

CVE-2026-31416 | netfilter: nfnetlink_log: account for netlink header size

Exploit prediction scoring system (EPSS) score for CVE-2026-31416

Common vulnerability scoring system (CVSS) metrics for CVE-2026-31416

Weakness enumeration for CVE-2026-31416

GitHub Security Advisory for CVE-2026-31416

OS Trackers for CVE-2026-31416

Affected software / configurations for CVE-2026-31416

References for CVE-2026-31416