accel/amxdna: Fix page-insertion errors in amdxdna_insert_pages()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74721
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:47 UTC
Updated2026-08-22 16:16:47 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e486147c912f653ef4b60a6c7dbd4168a4c56a9f 1501e4d07c6fee0d50531a0d1cb2be01a63e6e75 git Not specified
CNA Linux Linux affected e486147c912f653ef4b60a6c7dbd4168a4c56a9f 8d51e0fd3e698919d2adeff71936377f0c0d4aa0 git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1501e4d07c6fee0d50531a0d1cb2be01a63e6e75 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8d51e0fd3e698919d2adeff71936377f0c0d4aa0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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