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NVD / CVE Program· CNA Linux

CVE-2026-97963: net: stmmac: initialize ptp_lock at probe time

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 0338c68e22abd2ee509ec2e32508a50896618c32, 25cc0096efba83b4e0e6fa50f03e9543b41e9d3d, 420315413b29635de1d4ea4142e410e6465260f3; 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 0338c68e22abd2ee509ec2e32508a50896618c32, 25cc0096efba83b4e0e6fa50f03e9543b41e9d3d, 420315413b29635de1d4ea4142e410e6465260f3; 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: net: stmmac: initialize ptp_lock at probe time priv->ptp_lock is only initialized in stmmac_ptp_register(), which runs during __stmmac_open(). However, the lock is also used while the interface is down and has never been opened: tc_taprio_configure() invokes the PTP gettime64() callback to compute the EST base time when offloading a TAPRIO schedule, and stmmac_get_time() takes priv->ptp_lock. Using an uninitialized rwlock is undefined behaviour. Move the rwlock_init() to __stmmac_dvr_probe(), together with the other private locks, so that ptp_lock is always valid regardless of the interface state.

—No exploit Fix available
Published
Sep 25, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 6th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
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

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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.

—

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

    • 5.6affected
    • b60189e0392fa06348911077ef281eb2b1047b6a and later · before ee33e424d4932c70f103b94a46b685923f236f65affected · git
    • b60189e0392fa06348911077ef281eb2b1047b6a and later · before 7ced87834f3a58761d4bbcabf8326478548e6a54affected · git
    • b60189e0392fa06348911077ef281eb2b1047b6a and later · before 79fb5bcc50996964e076dffbdc24b7d2c06bd957affected · git
    • b60189e0392fa06348911077ef281eb2b1047b6a and later · before 420315413b29635de1d4ea4142e410e6465260f3affected · git
    • b60189e0392fa06348911077ef281eb2b1047b6a and later · before 25cc0096efba83b4e0e6fa50f03e9543b41e9d3daffected · git
    • b60189e0392fa06348911077ef281eb2b1047b6a and later · before b1986595cf827c38ff929e22fbc9ca8f76379306affected · git
    • b60189e0392fa06348911077ef281eb2b1047b6a and later · before 0338c68e22abd2ee509ec2e32508a50896618c32affected · git
    • before 5.6not 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-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-97961Sep 25, 2026 · perf/core: Allow list_del during perf_event_overflow()
    0Monitor
  • ← EarlierCVE-2026-97962Sep 25, 2026 · net/mlx5e: Move representor vnic reporter to eswitch devlink port
    0Monitor
  • Later →CVE-2026-97964Sep 25, 2026 · ppp_synctty: ensure a writeable skb header
    0Monitor

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 Linux0338c68e22abd2ee509ec2e32508a50896618c32Vendor (CNA)
Linux Linux25cc0096efba83b4e0e6fa50f03e9543b41e9d3dVendor (CNA)
Linux Linux420315413b29635de1d4ea4142e410e6465260f3Vendor (CNA)
Linux Linux79fb5bcc50996964e076dffbdc24b7d2c06bd957Vendor (CNA)
Linux Linux7ced87834f3a58761d4bbcabf8326478548e6a54Vendor (CNA)
Linux Linuxb1986595cf827c38ff929e22fbc9ca8f76379306Vendor (CNA)
Linux Linuxee33e424d4932c70f103b94a46b685923f236f65Vendor (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

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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. Fix✗ → ✓

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References

Show all references (6 more)

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

All records