# CVE-2026-74721: linux: In the Linux kernel, the following vulnerability has been resolved:  accel/amxdna: Fix page-insertion errors in amdxd...

CVE-2026-74721 is fixed in linux on 1 platform by DEBIAN-CVE-2026-74721 (version 7.1.9-1), released September 4, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-74721
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0013
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 22, 2026

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.1.9-1 | [DEBIAN-CVE-2026-74721](https://patchblox.com/security/data/fix/linux/debian-cve-2026-74721.md) | Sep 4, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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