# CVE-2026-74721 — Linux

> As of 2026-08-22, CVE-2026-74721 is a vulnerability in Linux, EPSS 0.1% (9.8th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-74721 as of 2026-08-22; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-22

## What is CVE-2026-74721?

In the Linux kernel, the following vulnerability has been resolved: accel/amxdna: Fix page-insertion errors in amdxdna_insert_pages() Two error paths in amdxdna_insert_pages() called vma->vm_ops->close(vma) before returning an error code to the caller. This is incorrect: amdxdna_gem_obj_mmap() registers an HMM interval notifier before calling amdxdna_insert_pages(), and on a hard error it jumps to hmm_unreg to undo that registration. Calling vm_ops->close() manually — which drops the shmem pages_pin_count and the GEM object reference that backs the VMA — before the mmap syscall has even returned causes those resources to be released while the VMA is still alive. The kernel VMA teardown will call vm_ops->close() a second time when the process later unmaps the range, producing a reference count underflow. Replace both hard-error returns with a deferred-fault approach that keeps the VMA alive and retries page insertion through the HMM range-fault path.

1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 44 days ago.

## Severity and exploitation probability

- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 9.8% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 0.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-22

## Is CVE-2026-74721 being exploited?

It currently carries a trending score of 32 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Linux](https://intel.threadlinqs.com/vendors/linux): Linux

## How to fix CVE-2026-74721

No vendor patch reference has been recorded for CVE-2026-74721 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-74721

No threat campaign in the Threadlinqs corpus currently references CVE-2026-74721, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-08-23.

**Other references**

- [git.kernel.org](https://git.kernel.org/stable/c/1501e4d07c6fee0d50531a0d1cb2be01a63e6e75)
- [git.kernel.org (8d51e0fd3e698919d2adeff71936377f0c0d4aa0)](https://git.kernel.org/stable/c/8d51e0fd3e698919d2adeff71936377f0c0d4aa0)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-74721
Full detection coverage and IOCs for threats exploiting CVE-2026-74721 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp