Bug 2482107 (CVE-2026-45880) - CVE-2026-45880 kernel: PCI/P2PDMA: Release per-CPU pgmap ref when vm_insert_page() fails
Summary: CVE-2026-45880 kernel: PCI/P2PDMA: Release per-CPU pgmap ref when vm_insert_p...
Keywords:
Status: NEW
Alias: CVE-2026-45880
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-27 15:11 UTC by OSIDB Bzimport
Modified: 2026-05-28 03:23 UTC (History)
2 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-05-27 15:11:39 UTC 
In the Linux kernel, the following vulnerability has been resolved:

PCI/P2PDMA: Release per-CPU pgmap ref when vm_insert_page() fails

When vm_insert_page() fails in p2pmem_alloc_mmap(), p2pmem_alloc_mmap()
doesn't invoke percpu_ref_put() to free the per-CPU ref of pgmap acquired
after gen_pool_alloc_owner(), and memunmap_pages() will hang forever when
trying to remove the PCI device.

Fix it by adding the missed percpu_ref_put().
Comment 1 Keith Grant 2026-05-28 03:20:16 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052715-CVE-2026-45880-4a0d@gregkh/T
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