Is CVE-2026-74309 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-74309 being exploited in the wild.

How severe is CVE-2026-74309?

Critical severity, with a CVSS score of 10, published 15 August 2026.

Which products and versions are affected?

Linux Kernel multiple versions affected; patch available.

Is there a fix for CVE-2026-74309?

A patch was published on 2026-02-24: Upstream fix commit 0d21a1d6375a05274291e32c1ab7cd57dbb69513 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-74309 attacked?

It is attacked over the network, in an operating system.

Am I affected by CVE-2026-74309?

Check whether you run Linux Kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-74309: Linux kernel vDPA Octeon EP IRQ-to-ring mapping logic error

CVE-2026-74309 · Severity: critical · CVSS 10 · Published 2026-08-15

A logic error in the Linux kernel's Octeon EP virtual device adapter causes incorrect mapping between interrupt numbers and packet-processing rings. When interrupt numbers are non-contiguous or the first interrupt isn't the base address, the device mishandles ring notifications, potentially causing data loss or service disruption in virtualized networking environments.

Technologies: Linux Kernel. Vendors: Linux.

Quick answers

Is CVE-2026-74309 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-74309 being exploited in the wild.
How severe is CVE-2026-74309?: Critical severity, with a CVSS score of 10, published 15 August 2026.
Which products and versions are affected?: Linux Kernel multiple versions affected; patch available.
Is there a fix for CVE-2026-74309?: A patch was published on 2026-02-24: Upstream fix commit 0d21a1d6375a05274291e32c1ab7cd57dbb69513 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-74309 attacked?: It is attacked over the network, in an operating system.
Am I affected by CVE-2026-74309?: Check whether you run Linux Kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is a logic error in the interrupt handler (drivers/vdpa/octeon_ep/octep_vdpa_main.c). The handler incorrectly calculated ring indices by assuming IRQ numbers are contiguous and based on irqs[0], using the formula (irq - irqs[0]). This fails when IRQ numbers are non-contiguous or the base IRQ isn't at position 0, causing the handler to index into the wrong virtual queues. The fix replaces the arithmetic calculation with an explicit lookup in the irqs array, ensuring correct ring indexing regardless of IRQ numbering. Attack preconditions are minimal—any guest driver accessing the affected Octeon EP device will trigger the mishandling. The patch was committed in February 2026 and backported to stable kernels.

Affected products

Linux Linux Kernel multiple versions affected; patch available

Timeline

2026-08-15: disclosed: CVE-2026-74309 published on NVD
2026-02-24: patched: Upstream fix commit 0d21a1d6375a05274291e32c1ab7cd57dbb69513
2026-07-24: patched: Backported to stable trees (commit 3ef0cfa77a3d526591be069850d186c255e3f0cc)

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.