SECUFOCUSNOW
Home›CVE index›CVE-2025-40272
Review reviewHigh

CVE-2025-40272

Linux

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 atte...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2025.12.07
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

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 atte...

Affected product and versions

Product
Linux
Affected versions
>= 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 < bb1c19636aedae39360e6fdbcaef4f2bcff25785, >= 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 < 1e4643d6628edf9c0047b1f8f5bc574665025acb, >= 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 < 42d486d35a4143cc37fc72ee66edc99d942dd367, >= 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 < 52f2d5cf33de9a8f5e72bbb0ed38282ae0bc4649, >= 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 < 4444767e625da46009fc94a453fd1967b80ba047, >= 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 < 6f86d0534fddfbd08687fa0f01479d4226bc3c3d, >= 5.14
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available