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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2025-40272

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-40272

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "1507f51255c9ff07d75909a84e7c0d7f3c4b2f49",
        "lessThan": "bb1c19636aedae39360e6fdbcaef4f2bcff25785",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1507f51255c9ff07d75909a84e7c0d7f3c4b2f49",
        "lessThan": "1e4643d6628edf9c0047b1f8f5bc574665025acb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1507f51255c9ff07d75909a84e7c0d7f3c4b2f49",
        "lessThan": "42d486d35a4143cc37fc72ee66edc99d942dd367",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1507f51255c9ff07d75909a84e7c0d7f3c4b2f49",
        "lessThan": "52f2d5cf33de9a8f5e72bbb0ed38282ae0bc4649",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1507f51255c9ff07d75909a84e7c0d7f3c4b2f49",
        "lessThan": "4444767e625da46009fc94a453fd1967b80ba047",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1507f51255c9ff07d75909a84e7c0d7f3c4b2f49",
        "lessThan": "6f86d0534fddfbd08687fa0f01479d4226bc3c3d",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "mm/secretmem.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.14"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.14",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.197",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.159",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.117",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.59",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.17.9",
        "versionType": "semver",
        "lessThanOrEqual": "6.17.*"
      },
      {
        "status": "unaffected",
        "version": "6.18",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "mm/secretmem.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-40272

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30703 · Revision 1
Added to Heist Feed
Publisher date
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