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NVD / CVE Program· CNA Linux

CVE-2026-97981: net: ethernet: cortina: Count dropped frames as NAPI work

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 27b5753077d1cfda5fe201d2ba602de76a9a09b1, 5754e0c0758805096ecfeaf4c1b146ad51ed246f, 58140f1cebb776d174dc6ff41c15401654a5b1ea; 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 27b5753077d1cfda5fe201d2ba602de76a9a09b1, 5754e0c0758805096ecfeaf4c1b146ad51ed246f, 58140f1cebb776d174dc6ff41c15401654a5b1ea; 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: ethernet: cortina: Count dropped frames as NAPI work The RX loop only consumes budget when it successfully delivers a frame. Error paths keep consuming descriptors without reducing the budget, so a stream of bad frames can process the entire receive ring in one poll. Move the budget accounting to a common end-of-frame path. This counts each completed frame as NAPI work whether it was delivered or dropped, matching the behavior of the vendor driver.

—No exploit Fix available
Published
Sep 25, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 7th 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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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
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  • 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.

—

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

    • 4.16affected
    • 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 and later · before 620b7184808b25cf58268856f892b9ba83c181fdaffected · git
    • 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 and later · before 9620e2ce9b5998ebbf157241f296f8ddb92285c2affected · git
    • 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 and later · before 27b5753077d1cfda5fe201d2ba602de76a9a09b1affected · git
    • 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 and later · before e858b9b1ea3cbbc353189d07dec40dc16967e290affected · git
    • 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 and later · before 58140f1cebb776d174dc6ff41c15401654a5b1eaaffected · git
    • 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 and later · before cceb6cd7f0e5ed2944a9ca22443d7b9da82f60abaffected · git
    • 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 and later · before 5754e0c0758805096ecfeaf4c1b146ad51ed246faffected · git
    • 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 and later · before b856c552f556bc0341c1dbe0bf88e630fd1dc4b7affected · git
    • before 4.16not 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-2026-97979Sep 25, 2026 · ice: add missing xa_destroy for sched_node_ids
    0Monitor
  • ← EarlierCVE-2026-97980Sep 25, 2026 · s390/debug: Fix NULL pointer dereference in debug_set_level()
    0Monitor
  • Later →CVE-2026-97982Sep 25, 2026 · net: ethernet: cortina: Fix budget accounting
    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 Linux27b5753077d1cfda5fe201d2ba602de76a9a09b1Vendor (CNA)
Linux Linux5754e0c0758805096ecfeaf4c1b146ad51ed246fVendor (CNA)
Linux Linux58140f1cebb776d174dc6ff41c15401654a5b1eaVendor (CNA)
Linux Linux620b7184808b25cf58268856f892b9ba83c181fdVendor (CNA)
Linux Linux9620e2ce9b5998ebbf157241f296f8ddb92285c2Vendor (CNA)
Linux Linuxb856c552f556bc0341c1dbe0bf88e630fd1dc4b7Vendor (CNA)
Linux Linuxcceb6cd7f0e5ed2944a9ca22443d7b9da82f60abVendor (CNA)
Linux Linuxe858b9b1ea3cbbc353189d07dec40dc16967e290Vendor (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✗ → ✓

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

References

Show all references (7 more)

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

All records