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NVD / CVE Program· CNA Linux

CVE-2026-80988: NTB: ntb_transport: Fail TX enqueue when the QP link is down

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 4.15, 4.20, 45cc11035165918dd1f81796ea98f81ece20d361.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 4.15, 4.20, 45cc11035165918dd1f81796ea98f81ece20d361 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: Fail TX enqueue when the QP link is down Commit f195a1a6fe41 ("ntb: Drop packets when qp link is down") meant to make ntb_transport_tx_enqueue() drop packets submitted while the QP link is down, but it only returns 0 without consuming the packet. Zero means success by this function's contract, so ntb_netdev reports NETDEV_TX_OK and forgets the skb: nothing queued it, nothing frees it, and it leaks, one skb for every transmit racing a link-down. Return -ENOLINK instead, restoring the contract that a non-zero return leaves the buffer owned by the caller. With the preceding patch, ntb_netdev frees the skb on non-retryable enqueue failures and returns NETDEV_TX_OK, so a packet racing with link-down is dropped without leaking or entering a busy retry loop.

—No exploit Fix available
Published
Sep 11, 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%

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Noroxi analysis

What does it mean in your environment?

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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

    • aa6d6ed213b62cbdb09ea32abbfa085dd987a0c9, a8986a61ebee0b54c5d648444fbae09bd1c6dcd2, 94491412a2afc8a5aea4c5b455aed86d3486f0b1, c2cd5d993f57f819d46fe62387d3cc34d8468e60, 449b1978d4e50b14b2a4de3a26d0b074593926a3, 6.6affected
    • 3cfdc448e8bfa8a7eaa5af87f357330566124b78 and later · before 76c9ccc0c6bebfc74c0e727eda67687f5103ab06affected · git
    • bfa051f650a7708183bd86901ca4645dcf88c486 and later · before 96d792c65b9d5f7f9dd86a1004315db59e450c07affected · git
    • 4f4af6b8b7a23fa37decaf43b55403e6bfd8e219 and later · before 45cc11035165918dd1f81796ea98f81ece20d361affected · git
    • f195a1a6fe416882984f8bd6c61afc1383171860 and later · before e6cc541fab01099fd8efadfa4f13afdf118bf536affected · git
    • f195a1a6fe416882984f8bd6c61afc1383171860 and later · before 5eca0d899a3be661a7e2caaaa7467a6fa15d756caffected · git
    • f195a1a6fe416882984f8bd6c61afc1383171860 and later · before 894e136b432da75c0352c80299807a5c4b04f167affected · git
    • f195a1a6fe416882984f8bd6c61afc1383171860 and later · before 89177732fe1653bbfef10cf5d99bf20cf57762c2affected · git
    • f195a1a6fe416882984f8bd6c61afc1383171860 and later · before 873ce713fef5dde0939220f04f3484ec86a16fbaaffected · git
    • 5.10.195 and later · before 5.10.270affected · 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-2026-80986Sep 11, 2026 · net/smc: bound the peer rkey counts in SMC-Rv2 LLC messages
    39Monitor
  • ← EarlierCVE-2026-80987Sep 11, 2026 · NTB: ntb_transport: Reject oversized TX buffers
    30Monitor
  • Later →CVE-2026-80989Sep 11, 2026 · net: thunderbolt: Mark the connection down when bringing it up fails
    35Monitor

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 Linux4.15Vendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux45cc11035165918dd1f81796ea98f81ece20d361Vendor (CNA)
Linux Linux5.10.270Vendor (CNA)
Linux Linux5.15.221Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux5eca0d899a3be661a7e2caaaa7467a6fa15d756cVendor (CNA)
Linux Linux6.1.188Vendor (CNA)
Linux Linux6.5Vendor (CNA)
Linux Linux6.6Vendor (CNA)
Linux Linux76c9ccc0c6bebfc74c0e727eda67687f5103ab06Vendor (CNA)
Linux Linux873ce713fef5dde0939220f04f3484ec86a16fbaVendor (CNA)
Linux Linux89177732fe1653bbfef10cf5d99bf20cf57762c2Vendor (CNA)
Linux Linux894e136b432da75c0352c80299807a5c4b04f167Vendor (CNA)
Linux Linux96d792c65b9d5f7f9dd86a1004315db59e450c07Vendor (CNA)
Linux Linuxe6cc541fab01099fd8efadfa4f13afdf118bf536Vendor (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

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 (7 more)

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

All records