CVE-2026-45880 PUBLISHED

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

Assigner: Linux
Reserved: 13.05.2026 Published: 27.05.2026 Updated: 27.05.2026

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().

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 7e9c7ef83d785236f5a8c3761dd053fae9b92fb8 to baa42b756d183a59572f3890981a3d32b8d05d40 (excl.)
  • affected from 7e9c7ef83d785236f5a8c3761dd053fae9b92fb8 to 51b7181cfbedf289ce794b6d97a1c596c309ec38 (excl.)
  • affected from 7e9c7ef83d785236f5a8c3761dd053fae9b92fb8 to e19cce88ec4c4877f4ff2469099b9cf23cc3e93e (excl.)
  • affected from 7e9c7ef83d785236f5a8c3761dd053fae9b92fb8 to a1f4dc72efc3204db95d052058d785cad7ce755f (excl.)
  • affected from 7e9c7ef83d785236f5a8c3761dd053fae9b92fb8 to 6220694c52a5a04102b48109e4f24e958b559bd3 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 6.2 is affected
  • unaffected from 0 to 6.2 (excl.)
  • unaffected from 6.6.128 to 6.6.* (incl.)
  • unaffected from 6.12.75 to 6.12.* (incl.)
  • unaffected from 6.18.14 to 6.18.* (incl.)
  • unaffected from 6.19.4 to 6.19.* (incl.)
  • unaffected from 7.0 to * (incl.)

References