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CVE-2025-68293

mm/huge_memory: fix NULL pointer deference when splitting folio

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerLinux
≫
Produkt Linux
Default Statusunaffected
Version c010d47f107f609b9f4d6a103b6dfc53889049e9
Version < 592db83615a9f0164472ec789c2ed34ad35f732f
Status affected
Version c010d47f107f609b9f4d6a103b6dfc53889049e9
Version < d1b83fbacd4397a1d2f8c6b13427a8636ae2b307
Status affected
Version c010d47f107f609b9f4d6a103b6dfc53889049e9
Version < cff47b9e39a6abf03dde5f4f156f841b0c54bba0
Status affected
HerstellerLinux
≫
Produkt Linux
Default Statusaffected
Version 6.9
Status affected
Version 0
Version < 6.9
Status unaffected
Version <= 6.12.*
Version 6.12.61
Status unaffected
Version <= 6.17.*
Version 6.17.11
Status unaffected
Version <= *
Version 6.18
Status unaffected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.02% 0.058
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
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