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NVD / CVE Program· CNA Linux

CVE-2026-98121: watchdog: msc313e: Fix NULL pointer dereference in PM callbacks

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: 0.12% (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 6495dc16e635356fd2b7535dcbf9b6779de4e753, 744b25040d8206f7925b8ba0be5edf93fa4bf81e, 960251cc4a413d8f1eef2a2c6aca41073b57ce16; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 6495dc16e635356fd2b7535dcbf9b6779de4e753, 744b25040d8206f7925b8ba0be5edf93fa4bf81e, 960251cc4a413d8f1eef2a2c6aca41073b57ce16; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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: watchdog: msc313e: Fix NULL pointer dereference in PM callbacks msc313e_wdt_probe() doesn't set the driver data for the platform device. As a result, dev_get_drvdata() in msc313e_wdt_suspend() and msc313e_wdt_resume() will return NULL, leading to a NULL pointer dereference afterward. Set the platform device driver data in msc313e_wdt_probe().

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Sep 25, 2026
Updated
Oct 22, 2026
EPSS
0.1% · 1th 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 · 0.1%

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 kernel5.14 and later · before 5.15.222
  • linux linux kernel5.16 and later · before 6.1.189
  • linux linux kernel6.2 and later · before 6.6.158
  • linux linux kernel6.7 and later · before 6.12.111
  • linux linux kernel6.13 and later · before 6.18.53
  • linux linux kernel6.19 and later · before 7.2.7
  • linux linux kernel7.3

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

    • 5.14affected
    • e9800b7994642a794afd4894f072541c14277ce8 and later · before 960251cc4a413d8f1eef2a2c6aca41073b57ce16affected · git
    • e9800b7994642a794afd4894f072541c14277ce8 and later · before afc3ea51e479289a23c642cc8bade67b94225ed9affected · git
    • e9800b7994642a794afd4894f072541c14277ce8 and later · before a135415be56839e555e0bcdd5ffb8d2f5f947bd7affected · git
    • e9800b7994642a794afd4894f072541c14277ce8 and later · before b02f902fe4b59d65f74a25c4523a75453bd3f808affected · git
    • e9800b7994642a794afd4894f072541c14277ce8 and later · before 744b25040d8206f7925b8ba0be5edf93fa4bf81eaffected · git
    • e9800b7994642a794afd4894f072541c14277ce8 and later · before 6495dc16e635356fd2b7535dcbf9b6779de4e753affected · git
    • e9800b7994642a794afd4894f072541c14277ce8 and later · before e3eceb76515910746e6268c4e4ac1c07516ebd7baffected · git
    • before 5.14not affected · semver
    • 5.15.222 and later · up to and including 5.15.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.7-17.2.7-1

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-2026-98119Sep 25, 2026 · netfs: break unbuffered write when netfs_alloc_subrequest() fails
    22Monitor
  • ← EarlierCVE-2026-98120Sep 25, 2026 · netfs: Fix subreq ref leak
    22Monitor
  • Later →CVE-2026-98122Sep 25, 2026 · vxlan: mdb: Fix use-after-free in vxlan_mdb_remote_src_del()
    31Monitor

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 Linux6495dc16e635356fd2b7535dcbf9b6779de4e753Vendor (CNA)
Linux Linux744b25040d8206f7925b8ba0be5edf93fa4bf81eVendor (CNA)
Linux Linux960251cc4a413d8f1eef2a2c6aca41073b57ce16Vendor (CNA)
Linux Linuxa135415be56839e555e0bcdd5ffb8d2f5f947bd7Vendor (CNA)
Linux Linuxafc3ea51e479289a23c642cc8bade67b94225ed9Vendor (CNA)
Linux Linuxb02f902fe4b59d65f74a25c4523a75453bd3f808Vendor (CNA)
Linux Linuxe3eceb76515910746e6268c4e4ac1c07516ebd7bVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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. CVSS— → 5.5
  2. Severity— → medium
  3. 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