What is the CVSS score of CVE-2026-23433?

CVE-2026-23433 has a CVSS 3.1 base score of 5.5 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Is there a patch available for CVE-2026-23433?

Yes, a patch is available for CVE-2026-23433. Update the affected software to the latest version immediately.

Linux CVE-2026-23433

EUVD-2026-18671 MEDIUM

NULL Pointer Dereference (CWE-476)

2026-04-03 Linux

Linux Null Pointer Dereference Denial Of Service Red Hat Suse

5.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.5 MEDIUM

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

SUSE

MEDIUM

qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

CVSS changed

Apr 23, 2026 - 21:11 NVD

5.5 (MEDIUM)

Patch available

Apr 16, 2026 - 05:29 EUVD

4ad79c874e53ebb7fe3b8ae7ac6c858a2121f415

EUVD ID Assigned

Apr 03, 2026 - 15:30 euvd

EUVD-2026-18671

Analysis Generated

Apr 03, 2026 - 15:30 vuln.today

CVE Published

Apr 03, 2026 - 15:15 nvd

N/A

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

arm_mpam: Fix null pointer dereference when restoring bandwidth counters

When an MSC supporting memory bandwidth monitoring is brought offline and then online, mpam_restore_mbwu_state() calls __ris_msmon_read() via ipi to restore the configuration of the bandwidth counters. It doesn't care about the value read, mbwu_arg.val, and doesn't set it leading to a null pointer dereference when __ris_msmon_read() adds to it. This results in a kernel oops with a call trace such as:

Call trace: __ris_msmon_read+0x19c/0x64c (P) mpam_restore_mbwu_state+0xa0/0xe8 smp_call_on_cpu_callback+0x1c/0x38 process_one_work+0x154/0x4b4 worker_thread+0x188/0x310 kthread+0x11c/0x130 ret_from_fork+0x10/0x20

Provide a local variable for val to avoid __ris_msmon_read() dereferencing a null pointer when adding to val.

AnalysisAI

Null pointer dereference in Linux kernel arm_mpam memory bandwidth monitoring causes kernel oops when an MSC supporting bandwidth monitoring transitions offline and back online. The mpam_restore_mbwu_state() function fails to initialize a value buffer before passing it to __ris_msmon_read() via IPI, triggering a crash in the bandwidth counter restoration routine. This affects ARM systems with MPAM (Memory Partitioning and Monitoring) support and results in denial of service through system instability when memory controllers are toggled.

Technical ContextAI

The vulnerability exists in ARM's Memory Partitioning and Monitoring (MPAM) subsystem within the Linux kernel. When a Memory System Controller (MSC) supporting memory bandwidth unit (MBWU) monitoring is brought offline and online, the mpam_restore_mbwu_state() function attempts to restore bandwidth counter configuration by issuing an inter-processor interrupt (IPI) to invoke __ris_msmon_read(). The root cause is a missing initialization of the mbwu_arg.val parameter-a pointer to a local variable that receives the bandwidth counter value. The __ris_msmon_read() function attempts to dereference and add to this uninitialized pointer, resulting in a null pointer dereference. This is a straightforward initialization omission (CWE-476 class) within the ARM MPAM driver code path triggered during system state transitions.

RemediationAI

Apply the upstream kernel fix by updating to a patched version containing commits ac3e12bc195786d3d44d730b5b2259fd36191848 or 4ad79c874e53ebb7fe3b8ae7ac6c858a2121f415 from the Linux stable repository (https://git.kernel.org/stable). The fix involves adding a local variable initialization for val before passing it to __ris_msmon_read(), preventing null pointer dereference. Distributions should backport these commits to their respective kernel versions. Users unable to immediately patch should avoid dynamic offlining/onlining of MPAM-enabled memory controllers until a fixed kernel is deployed.

Same weakness CWE-476 – NULL Pointer Dereference

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Same technique Null Pointer Dereference

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CVE-2014-3470 MEDIUM

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CVE-2017-3730 HIGH POC

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CVE-2017-3169 CRITICAL POC

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Vendor StatusVendor

SUSE

Severity: Medium

Product	Status
SUSE Linux Enterprise Desktop 15 SP7	Fixed
SUSE Linux Enterprise Desktop 15 SP7	Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7	Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7	Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7	Fixed

CVE-2026-23433 vulnerability details – vuln.today

Back

Linux CVE-2026-23433

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

Same weakness CWE-476 – NULL Pointer Dereference

Same technique Null Pointer Dereference

Vendor StatusVendor

SUSE

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External POC / Exploit Code