CVE-2025-68293 (GCVE-0-2025-68293)

Vulnerability from cvelistv5 – Published: 2025-12-16 15:06 – Updated: 2025-12-16 15:06
VLAI?
Title
mm/huge_memory: fix NULL pointer deference when splitting folio
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/huge_memory: fix NULL pointer deference when splitting folio Commit c010d47f107f ("mm: thp: split huge page to any lower order pages") introduced an early check on the folio's order via mapping->flags before proceeding with the split work. This check introduced a bug: for shmem folios in the swap cache and truncated folios, the mapping pointer can be NULL. Accessing mapping->flags in this state leads directly to a NULL pointer dereference. This commit fixes the issue by moving the check for mapping != NULL before any attempt to access mapping->flags.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c010d47f107f609b9f4d6a103b6dfc53889049e9 , < 592db83615a9f0164472ec789c2ed34ad35f732f (git)
Affected: c010d47f107f609b9f4d6a103b6dfc53889049e9 , < d1b83fbacd4397a1d2f8c6b13427a8636ae2b307 (git)
Affected: c010d47f107f609b9f4d6a103b6dfc53889049e9 , < cff47b9e39a6abf03dde5f4f156f841b0c54bba0 (git)
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    Linux Linux Affected: 6.9
Unaffected: 0 , < 6.9 (semver)
Unaffected: 6.12.61 , ≤ 6.12.* (semver)
Unaffected: 6.17.11 , ≤ 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/huge_memory: fix NULL pointer deference when splitting folio\n\nCommit c010d47f107f (\"mm: thp: split huge page to any lower order pages\")\nintroduced an early check on the folio\u0027s order via mapping-\u003eflags before\nproceeding with the split work.\n\nThis check introduced a bug: for shmem folios in the swap cache and\ntruncated folios, the mapping pointer can be NULL.  Accessing\nmapping-\u003eflags in this state leads directly to a NULL pointer dereference.\n\nThis commit fixes the issue by moving the check for mapping != NULL before\nany attempt to access mapping-\u003eflags."
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      "providerMetadata": {
        "dateUpdated": "2025-12-16T15:06:13.428Z",
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    "datePublished": "2025-12-16T15:06:13.428Z",
    "dateReserved": "2025-12-16T14:48:05.292Z",
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