CVE-2026-23019 [Medium] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: net: marvell: prestera: fix NULL dereference on devlink_alloc() failure devlink_alloc() may return NULL on allocation failure, but prestera_devlink_alloc() unconditionally calls devlink_priv() on the returned pointer. This leads to a NULL pointer dereference if devlink allocation fails. Add a check for a NULL devlink pointer and return NULL early to avoid the crash.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-01-31	—	0.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-01-31

—

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-2026-23019

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2026-23019 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 5, open 1.	https://security-tracker.debian.org/tracker/CVE-2026-23019
`redhat`	—	—	https://access.redhat.com/security/cve/CVE-2026-23019
`suse`	medium	CVE-2026-23019 severity moderate: SUSE including 16 source package names (cluster-md-kmp-default, dlm-kmp-default, …), 64 product×package rows across 13 product lines (SUSE Linux Enterprise Live Patching 12 SP5, SUSE Linux Enterprise Micro 5.0, … (13 product lines)): Known Not Affected 64.	https://www.suse.com/security/cve/CVE-2026-23019/
`ubuntu`	medium	CVE-2026-23019 medium priority: Ubuntu including 157 source packages (linux, linux-allwinner-5.19, …), 1256 status rows across 8 suites (bionic, focal, jammy, noble, questing, trusty, upstream, xenial): DNE 871, ignored 169, released 114, needed 50, not-affected 46, pending 6.	https://ubuntu.com/security/CVE-2026-23019

Affected software / configurations for CVE-2026-23019

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 5.10.1, < 5.15.198	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 6.1.161	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.2, < 6.6.121	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.7, < 6.12.66	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.13, < 6.18.6	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	5.10	cpe:2.3:o:linux:linux_kernel:5.10:-::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc1::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc2::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc3::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc4::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc5::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc6::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc7::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc8::::::

References for CVE-2026-23019

URL	Tags
https://git.kernel.org/stable/c/325aea74be7e192b5c947c782da23b0d19a5fda2	Patch
https://git.kernel.org/stable/c/326a4b7e61d01db3507f71c8bb5e85362f607064	Patch
https://git.kernel.org/stable/c/3950054c9512add0cc79ab7e72b6d2f9f675e25b	Patch
https://git.kernel.org/stable/c/8a4333b2818f0d853b43e139936c20659366e4a0	Patch
https://git.kernel.org/stable/c/94e070cd50790317fba7787ae6006934b7edcb6f	Patch
https://git.kernel.org/stable/c/a428e0da1248c353557970848994f35fd3f005e2	Patch

URL

CVE-2026-23019 | net: marvell: prestera: fix NULL dereference on devlink_alloc() failure

Exploit prediction scoring system (EPSS) score for CVE-2026-23019

Common vulnerability scoring system (CVSS) metrics for CVE-2026-23019

Weakness enumeration for CVE-2026-23019

OS Trackers for CVE-2026-23019

Affected software / configurations for CVE-2026-23019

References for CVE-2026-23019