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NVD / CVE Program· CNA Linux

CVE-2026-23237: platform/x86: classmate-laptop: Add missing NULL pointer checks

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.21% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 97528b1622b8f129574d29a571c32a3c85eafa3c, 993708fc18d0d0919db438361b4e8c1f980a8d1b, 9cf4b9b8ad09d6e05307abc4e951cabdff4be652; cbl2 kernel 5.15.200.1-1 on CBL Mariner 2.0 5.15.202.1-1.

Low priority for now. Upgrade to Linux Linux 97528b1622b8f129574d29a571c32a3c85eafa3c, 993708fc18d0d0919db438361b4e8c1f980a8d1b, 9cf4b9b8ad09d6e05307abc4e951cabdff4be652; cbl2 kernel 5.15.200.1-1 on CBL Mariner 2.0 5.15.202.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: platform/x86: classmate-laptop: Add missing NULL pointer checks In a few places in the Classmate laptop driver, code using the accel object may run before that object's address is stored in the driver data of the input device using it. For example, cmpc_accel_sensitivity_store_v4() is the "show" method of cmpc_accel_sensitivity_attr_v4 which is added in cmpc_accel_add_v4(), before calling dev_set_drvdata() for inputdev->dev. If the sysfs attribute is accessed prematurely, the dev_get_drvdata(&inputdev->dev) call in in cmpc_accel_sensitivity_store_v4() returns NULL which leads to a NULL pointer dereference going forward. Moreover, sysfs attributes using the input device are added before initializing that device by cmpc_add_acpi_notify_device() and if one of them is accessed before running that function, a NULL pointer dereference will occur. For example, cmpc_accel_sensitivity_attr_v4 is added before calling cmpc_add_acpi_notify_device() and if it is read prematurely, the dev_get_drvdata(&acpi->dev) call in cmpc_accel_sensitivity_show_v4() returns NULL which leads to a NULL pointer dereference going forward. Fix this by adding NULL pointer checks in all of the relevant places.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Mar 4, 2026
Updated
Nov 5, 2026
EPSS
0.2% · 11th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel2.6.33.1 and later · before 5.10.251
  • linux linux kernel5.11 and later · before 5.15.201
  • linux linux kernel5.16 and later · before 6.1.164
  • linux linux kernel6.2 and later · before 6.6.127
  • linux linux kernel6.7 and later · before 6.12.74
  • linux linux kernel6.13 and later · before 6.18.13
  • linux linux kernel2.6.33
  • linux linux kernel6.19

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.33affected
    • 529aa8cb0a59367d08883f818e8c47028e819d0d and later · before 993708fc18d0d0919db438361b4e8c1f980a8d1baffected · git
    • 529aa8cb0a59367d08883f818e8c47028e819d0d and later · before af673209d43b46257540997aba042b90ef3258c0affected · git
    • 529aa8cb0a59367d08883f818e8c47028e819d0d and later · before eb214804f03c829decf10998e9b7dd26f4c8ab9eaffected · git
    • 529aa8cb0a59367d08883f818e8c47028e819d0d and later · before 9cf4b9b8ad09d6e05307abc4e951cabdff4be652affected · git
    • 529aa8cb0a59367d08883f818e8c47028e819d0d and later · before da6e06a5fdbabea3870d18c227734b5dea5b3be6affected · git
    • 529aa8cb0a59367d08883f818e8c47028e819d0d and later · before 97528b1622b8f129574d29a571c32a3c85eafa3caffected · git
    • 529aa8cb0a59367d08883f818e8c47028e819d0d and later · before fe747d7112283f47169e9c16e751179a9b38611eaffected · git
    • before 2.6.33not affected · semver
    • 5.10.251 and later · up to and including 5.10.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.164-16.1.164-1
Debian:13linuxbefore 6.12.74-26.12.74-2
Debian:14linuxbefore 6.18.13-16.18.13-1
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7_Update_15before 1-150700.15.3.11-150700.15.3.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-64kbbefore 6.4.0-150700.53.55.16.4.0-150700.53.55.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-defaultbefore 6.4.0-150700.53.55.16.4.0-150700.53.55.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-default-basebefore 6.4.0-150700.53.55.1.150700.17.33.16.4.0-150700.53.55.1.150700.17.33.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-sourcebefore 6.4.0-150700.53.55.16.4.0-150700.53.55.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-zfcpdumpbefore 6.4.0-150700.53.55.16.4.0-150700.53.55.1
SUSE:Linux Enterprise Module for Development Tools 15 SP7kernel-docsbefore 6.4.0-150700.53.55.16.4.0-150700.53.55.1
SUSE:Linux Enterprise Module for Development Tools 15 SP7kernel-obs-buildbefore 6.4.0-150700.53.55.16.4.0-150700.53.55.1
SUSE:Linux Enterprise Module for Development Tools 15 SP7kernel-symsbefore 6.4.0-150700.53.55.16.4.0-150700.53.55.1
SUSE:Linux Enterprise Module for Public Cloud 15 SP7kernel-azurebefore 6.4.0-150700.53.55.16.4.0-150700.53.55.1
SUSE:Linux Micro Extras 6.2kernel-obs-buildbefore 6.12.0-160000.33.16.12.0-160000.33.1
SUSE:Linux Micro Extras 6.2kernel-symsbefore 6.12.0-160000.33.16.12.0-160000.33.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-23231Mar 4, 2026 · netfilter: nf_tables: fix use-after-free in nf_tables_addchain()
    31Monitor
  • ← EarlierCVE-2025-71238Mar 4, 2026 · scsi: qla2xxx: Fix bsg_done() causing double free
    31Monitor
  • Later →CVE-2024-14027Mar 9, 2026 · xattr: switch to CLASS(fd)
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux97528b1622b8f129574d29a571c32a3c85eafa3cVendor (CNA)
Linux Linux993708fc18d0d0919db438361b4e8c1f980a8d1bVendor (CNA)
Linux Linux9cf4b9b8ad09d6e05307abc4e951cabdff4be652Vendor (CNA)
Linux Linuxaf673209d43b46257540997aba042b90ef3258c0Vendor (CNA)
Linux Linuxda6e06a5fdbabea3870d18c227734b5dea5b3be6Vendor (CNA)
Linux Linuxeb214804f03c829decf10998e9b7dd26f4c8ab9eVendor (CNA)
Linux Linuxfe747d7112283f47169e9c16e751179a9b38611eVendor (CNA)
cbl2 kernel 5.15.200.1-1 on CBL Mariner 2.05.15.202.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.164-1 · Debian:12Package registry (OSV)
suse:kernel-64kb6.4.0-150700.53.55.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)
suse:kernel-azure6.4.0-150700.53.55.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP7Package registry (OSV)
suse:kernel-default6.4.0-150700.53.55.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)
suse:kernel-default-base6.4.0-150700.53.55.1.150700.17.33.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)
suse:kernel-docs6.4.0-150700.53.55.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7Package registry (OSV)
suse:kernel-livepatch-SLE15-SP7_Update_151-150700.15.3.1 · SUSE:Linux Enterprise Live Patching 15 SP7Package registry (OSV)
suse:kernel-obs-build6.12.0-160000.33.1 · SUSE:Linux Micro Extras 6.2Package registry (OSV)
suse:kernel-source6.4.0-150700.53.55.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)
suse:kernel-syms6.12.0-160000.33.1 · SUSE:Linux Micro Extras 6.2Package registry (OSV)
suse:kernel-zfcpdump6.4.0-150700.53.55.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records