CVE-2025-40272 (GCVE-0-2025-40272)

Vulnerability from cvelistv5 – Published: 2025-12-06 21:50 – Updated: 2025-12-06 21:50
VLAI?
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 , < bb1c19636aedae39360e6fdbcaef4f2bcff25785 (git)
Affected: 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 , < 1e4643d6628edf9c0047b1f8f5bc574665025acb (git)
Affected: 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 , < 42d486d35a4143cc37fc72ee66edc99d942dd367 (git)
Affected: 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 , < 52f2d5cf33de9a8f5e72bbb0ed38282ae0bc4649 (git)
Affected: 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 , < 4444767e625da46009fc94a453fd1967b80ba047 (git)
Affected: 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 , < 6f86d0534fddfbd08687fa0f01479d4226bc3c3d (git)
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    Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.15.197 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.117 , ≤ 6.6.* (semver)
Unaffected: 6.12.59 , ≤ 6.12.* (semver)
Unaffected: 6.17.9 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/secretmem: fix use-after-free race in fault handler\n\nWhen a page fault occurs in a secret memory file created with\n`memfd_secret(2)`, the kernel will allocate a new folio for it, mark the\nunderlying page as not-present in the direct map, and add it to the file\nmapping.\n\nIf two tasks cause a fault in the same page concurrently, both could end\nup allocating a folio and removing the page from the direct map, but only\none would succeed in adding the folio to the file mapping.  The task that\nfailed undoes the effects of its attempt by (a) freeing the folio again\nand (b) putting the page back into the direct map.  However, by doing\nthese two operations in this order, the page becomes available to the\nallocator again before it is placed back in the direct mapping.\n\nIf another task attempts to allocate the page between (a) and (b), and the\nkernel tries to access it via the direct map, it would result in a\nsupervisor not-present page fault.\n\nFix the ordering to restore the direct map before the folio is freed."
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}


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