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NVD / CVE Program· CNA Linux

CVE-2026-74626: NTB: ntb_netdev: Preserve RX queue depth on allocation failure

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 18781cc0bfb5c7f2a51ac6d678a28f101b7c35c5, 272df0fbe6f3e04e22bc67fbdd9ac24586b942f4, 3f2a15f33f86f7bd5b920669fd40c06725d72a1e.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 18781cc0bfb5c7f2a51ac6d678a28f101b7c35c5, 272df0fbe6f3e04e22bc67fbdd9ac24586b942f4, 3f2a15f33f86f7bd5b920669fd40c06725d72a1e 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_netdev: Preserve RX queue depth on allocation failure ntb_netdev_rx_handler() hands the received skb to the network stack before allocating its replacement. If the allocation fails, nothing is reposted. Every failure therefore takes one buffer out of the RX queue while the interface remains up, and enough failures eventually stall reception. A retry path could refill the queue later, but ntb_netdev has none. Allocate the replacement first instead. If that fails, drop the packet and repost the same skb. This keeps the queue full and lets packet delivery resume as soon as memory is available again.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Aug 22, 2026
Updated
Oct 16, 2026
EPSS
0.5% · 43th 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-2026-74626

When you'll hear from us

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  • 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
    • 548c237c0a9972df5d1afaca38aa733ee577128d and later · before 6d7f8a23c130d768c0976c2578b214353674e18faffected · git
    • 548c237c0a9972df5d1afaca38aa733ee577128d and later · before 18781cc0bfb5c7f2a51ac6d678a28f101b7c35c5affected · git
    • 548c237c0a9972df5d1afaca38aa733ee577128d and later · before 272df0fbe6f3e04e22bc67fbdd9ac24586b942f4affected · git
    • 548c237c0a9972df5d1afaca38aa733ee577128d and later · before fcaf8ba7e56bb73319ac107a63b907d59536192caffected · git
    • 548c237c0a9972df5d1afaca38aa733ee577128d and later · before 3f2a15f33f86f7bd5b920669fd40c06725d72a1eaffected · git
    • 548c237c0a9972df5d1afaca38aa733ee577128d and later · before a4e340971fe8ccd245d206db4d43b2a0eec240bdaffected · git
    • 548c237c0a9972df5d1afaca38aa733ee577128d and later · before 755fd7843f300d724caceabdf9bb13adc8701540affected · git
    • 548c237c0a9972df5d1afaca38aa733ee577128d and later · before d2121faf133ac3bf9531b53a7e21273649a08517affected · 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 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.107-1~deb12u16.12.107-1~deb12u1
Debian:13linuxbefore 6.12.107-16.12.107-1
Debian:14linuxbefore 7.1.9-17.1.9-1

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-2026-74624Aug 22, 2026 · netfilter: nf_conntrack: defer invalid log until after unlock
    30Monitor
  • ← EarlierCVE-2026-74625Aug 22, 2026 · netfilter: bridge: release template ct on non-IP path
    30Monitor
  • Later →CVE-2026-74627Aug 22, 2026 · net: devmem: prevent net-iov / page mixing
    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 Linux18781cc0bfb5c7f2a51ac6d678a28f101b7c35c5Vendor (CNA)
Linux Linux272df0fbe6f3e04e22bc67fbdd9ac24586b942f4Vendor (CNA)
Linux Linux3f2a15f33f86f7bd5b920669fd40c06725d72a1eVendor (CNA)
Linux Linux6d7f8a23c130d768c0976c2578b214353674e18fVendor (CNA)
Linux Linux755fd7843f300d724caceabdf9bb13adc8701540Vendor (CNA)
Linux Linuxa4e340971fe8ccd245d206db4d43b2a0eec240bdVendor (CNA)
Linux Linuxd2121faf133ac3bf9531b53a7e21273649a08517Vendor (CNA)
Linux Linuxfcaf8ba7e56bb73319ac107a63b907d59536192cVendor (CNA)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~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