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NVD / CVE Program· CNA Linux

CVE-2026-80987: NTB: ntb_transport: Reject oversized TX buffers

Noroxi assessment

Priority: Monitor (action score 30/100)

  • 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: 0.50% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 4890152a3069f5cb58cc24b08cfd5fe95e568fa1, 668aa3238548584ca9772da9cf43ae8c2389bbf1, 6b6bbc6c878d64eacc60877df49fce7b1b6a08d0.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 4890152a3069f5cb58cc24b08cfd5fe95e568fa1, 668aa3238548584ca9772da9cf43ae8c2389bbf1, 6b6bbc6c878d64eacc60877df49fce7b1b6a08d0 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: NTB: ntb_transport: Reject oversized TX buffers ntb_process_tx() handles an oversized buffer by calling tx_handler() with a NULL data pointer and returning success. ntb_netdev therefore neither frees the skb in its completion callback nor takes its enqueue error path, leaking it. Reject oversized buffers in ntb_transport_tx_enqueue() before acquiring a queue entry and return -EMSGSIZE. The caller retains ownership of the buffer, and the preceding netdev patch frees the skb when enqueue returns this permanent error.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Sep 11, 2026
Updated
Oct 19, 2026
EPSS
0.5% · 42th percentile
CWE
—

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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.

Follow CVE-2026-80987

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.

—

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

    • 3.9affected
    • fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 and later · before 4890152a3069f5cb58cc24b08cfd5fe95e568fa1affected · git
    • fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 and later · before 668aa3238548584ca9772da9cf43ae8c2389bbf1affected · git
    • fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 and later · before 9b0fa8a9e1057614a533cc3f18b17f82aab028d8affected · git
    • fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 and later · before b6db88cde0fb5c3bd2d3cd2bebcc06b5ce146e88affected · git
    • fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 and later · before a7f22105a7df8c7fd74d0af27ace6fa94fe03d87affected · git
    • fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 and later · before 6b6bbc6c878d64eacc60877df49fce7b1b6a08d0affected · git
    • fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 and later · before 75a604e9f1cfdebda421062fdf42225ca32154cdaffected · git
    • fce8a7bb5b4bfb8a27324703fd5b002ee9247e90 and later · before a4f2387db6f1cc2f03abba7f3a6807ad61e26ff7affected · git
    • before 3.9not 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 7.2.6-17.2.6-1

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-2026-80985Sep 11, 2026 · net/smc: carry oversized SMC-Rv2 LLC messages in the queue entry
    32Monitor
  • ← EarlierCVE-2026-80986Sep 11, 2026 · net/smc: bound the peer rkey counts in SMC-Rv2 LLC messages
    39Monitor
  • Later →CVE-2026-80988Sep 11, 2026 · NTB: ntb_transport: Fail TX enqueue when the QP link is down
    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 Linux4890152a3069f5cb58cc24b08cfd5fe95e568fa1Vendor (CNA)
Linux Linux668aa3238548584ca9772da9cf43ae8c2389bbf1Vendor (CNA)
Linux Linux6b6bbc6c878d64eacc60877df49fce7b1b6a08d0Vendor (CNA)
Linux Linux75a604e9f1cfdebda421062fdf42225ca32154cdVendor (CNA)
Linux Linux9b0fa8a9e1057614a533cc3f18b17f82aab028d8Vendor (CNA)
Linux Linuxa4f2387db6f1cc2f03abba7f3a6807ad61e26ff7Vendor (CNA)
Linux Linuxa7f22105a7df8c7fd74d0af27ace6fa94fe03d87Vendor (CNA)
Linux Linuxb6db88cde0fb5c3bd2d3cd2bebcc06b5ce146e88Vendor (CNA)
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

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • 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
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

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 (7 more)

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

All records