What’s Vulnerable › Vulnerabilities

CVE-2026-45880: PCI/P2PDMA: Release per-CPU pgmap ref when vm_insert_page() fails

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-27 · updated 2026-06-25

Description

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().

Affected products

• Linux kernel: from 6.2 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.14; from 6.19 before 6.19.4 — fixed in 6.12.75, 6.18.14, 6.19.4, 6.6.128

How to fix

Upgrade to a fixed version: Linux kernel 6.12.75, 6.18.14, 6.19.4, 6.6.128. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/51b7181cfbedf289ce794b6d97a1c596c309ec38
• https://git.kernel.org/stable/c/6220694c52a5a04102b48109e4f24e958b559bd3
• https://git.kernel.org/stable/c/a1f4dc72efc3204db95d052058d785cad7ce755f
• https://git.kernel.org/stable/c/baa42b756d183a59572f3890981a3d32b8d05d40
• https://git.kernel.org/stable/c/e19cce88ec4c4877f4ff2469099b9cf23cc3e93e

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