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CVE-2025-68293

mm/huge_memory: fix NULL pointer deference when splitting folio

Description

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.

Timeline

  1. ID reserved

    By Linux

  2. Published

  3. · 5 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Deferred.

EPSS (exploitation in 30 days)
0.21% · top 89% of all CVEs (11 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.

Affected products

  • Linux · Linux

    • affected c010d47f107f609b9f4d6a103b6dfc53889049e9 – < 592db83615a9f0164472ec789c2ed34ad35f732f
    • affected c010d47f107f609b9f4d6a103b6dfc53889049e9 – < d1b83fbacd4397a1d2f8c6b13427a8636ae2b307
    • affected c010d47f107f609b9f4d6a103b6dfc53889049e9 – < cff47b9e39a6abf03dde5f4f156f841b0c54bba0

  • Linux · Linux

    • affected 6.9
    • unaffected < 6.9
    • unaffected 6.12.61 – ≤ 6.12.*
    • unaffected 6.17.11 – ≤ 6.17.*
    • unaffected 6.18 – ≤ *

References

References3

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .