Is CVE-2026-74279 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-74279 being exploited in the wild.

How severe is CVE-2026-74279?

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

Which products and versions are affected?

Linux Kernel affected versions with Cavium CPT driver (approximately 4.19 and later).

Is there a fix for CVE-2026-74279?

A patch was published on 2026-06-02. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-74279 attacked?

It is attacked with local access, in an operating system.

Am I affected by CVE-2026-74279?

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-2026-74279: Linux kernel Cavium CPT DMA cleanup off-by-one error

CVE-2026-74279 · Severity: critical · CVSS 10 · Published 2026-08-15

A bug in the Linux kernel's Cavium cryptographic accelerator driver causes incorrect cleanup of DMA-mapped memory buffers when an error occurs during setup. The faulty code repeatedly attempts to unmap the wrong buffer entry, potentially causing memory corruption or system instability while leaving other buffers unmapped and leaking memory.

Technologies: Linux Kernel. Vendors: Linux.

Quick answers

Is CVE-2026-74279 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-74279 being exploited in the wild.
How severe is CVE-2026-74279?: Critical severity, with a CVSS score of 10, published 15 August 2026.
Which products and versions are affected?: Linux Kernel affected versions with Cavium CPT driver (approximately 4.19 and later).
Is there a fix for CVE-2026-74279?: A patch was published on 2026-06-02. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-74279 attacked?: It is attacked with local access, in an operating system.
Am I affected by CVE-2026-74279?: 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

An off-by-one error in the sg_cleanup error path of the Cavium CPT virtual function driver uses the wrong loop index (list[i] instead of list[j]) when unmapping DMA buffers. This causes successfully mapped entries to remain mapped (leak) while the failed entry is unmapped repeatedly. The vulnerable code is in drivers/crypto/cavium/cpt/cptvf_reqmanager.c in the setup_sgio_components() function. Exploitation requires local kernel code execution to trigger the error path during DMA buffer setup. The fix corrects the index reference in two dma_unmap_single() calls to use the correct loop variable. Patches are available in the Linux kernel stable tree.

Affected products

Linux Linux kernel affected versions with Cavium CPT driver (approximately 4.19 and later)

Timeline

2026-08-15: disclosed
2026-06-02: patched

References

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