CVE-2025-40272 Affecting libperf package, versions *


Severity

Recommended
medium

Based on CentOS security rating.

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  • Snyk IDSNYK-CENTOS10-LIBPERF-14225499
  • published9 Dec 2025
  • disclosed6 Dec 2025

Introduced: 6 Dec 2025

NewCVE-2025-40272  (opens in a new tab)

How to fix?

There is no fixed version for Centos:10 libperf.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libperf package and not the libperf package as distributed by Centos. See How to fix? for Centos:10 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

mm/secretmem: fix use-after-free race in fault handler

When a page fault occurs in a secret memory file created with memfd_secret(2), the kernel will allocate a new folio for it, mark the underlying page as not-present in the direct map, and add it to the file mapping.

If two tasks cause a fault in the same page concurrently, both could end up allocating a folio and removing the page from the direct map, but only one would succeed in adding the folio to the file mapping. The task that failed undoes the effects of its attempt by (a) freeing the folio again and (b) putting the page back into the direct map. However, by doing these two operations in this order, the page becomes available to the allocator again before it is placed back in the direct mapping.

If another task attempts to allocate the page between (a) and (b), and the kernel tries to access it via the direct map, it would result in a supervisor not-present page fault.

Fix the ordering to restore the direct map before the folio is freed.

CVSS Base Scores

version 3.1