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

mediumCVSS 5.3CVE-2026-74626

CSIRTS triage

vendor: Linux product: Linux Kernel Denial of service

What: NTB (Non-Transparent Bridge) netdev driver does not properly preserve RX queue depth when buffer allocation fails, causing queue corruption.
Who is affected: Systems using NTB NetDev interface for cross-adapter communication.
Urgency: Medium priority; allocation failure handling is incorrect and can degrade networking reliability.
Action: Apply kernel patches addressing CVE-2026-74626 when available through distribution updates.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.3
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74626

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-746260.43% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 35% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-74626	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for NTB

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-74626: In the Linux kernel, the following vulnerability has been resolved: NTB: ntb_netdev: Preserve …nvd · 2026-08-22
highCVE-2026-68368: usb: gadget: f_ncm: validate datagram bounds in ncm_unwrap_ntb()msrc · 2026-08-11
mediumCVE-2026-12052: The USB device-side CDC NCM class control-to-host handler usbd_cdc_ncm_cth in subsys/usb/devic…nvd · 2026-08-11
unknownCVE-2026-68368: In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_ncm: valida…nvd · 2026-08-10
highCVE-2026-64254: NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BARmsrc · 2026-08-06
highCVE-2026-64430: In the Linux kernel, the following vulnerability has been resolved: NTB: epf: Avoid calling pc…nvd · 2026-07-25