CVE-2025-37818 (GCVE-0-2025-37818)

Vulnerability from cvelistv5 – Published: 2025-05-08 06:26 – Updated: 2025-11-03 19:55
VLAI?
Summary
In the Linux kernel, the following vulnerability has been resolved: LoongArch: Return NULL from huge_pte_offset() for invalid PMD LoongArch's huge_pte_offset() currently returns a pointer to a PMD slot even if the underlying entry points to invalid_pte_table (indicating no mapping). Callers like smaps_hugetlb_range() fetch this invalid entry value (the address of invalid_pte_table) via this pointer. The generic is_swap_pte() check then incorrectly identifies this address as a swap entry on LoongArch, because it satisfies the "!pte_present() && !pte_none()" conditions. This misinterpretation, combined with a coincidental match by is_migration_entry() on the address bits, leads to kernel crashes in pfn_swap_entry_to_page(). Fix this at the architecture level by modifying huge_pte_offset() to check the PMD entry's content using pmd_none() before returning. If the entry is invalid (i.e., it points to invalid_pte_table), return NULL instead of the pointer to the slot.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: fa96b57c149061f71a70bd6582d995f6424fbbf4 , < 34256805720993e37adf6127371a1265aea8376a (git)
Affected: fa96b57c149061f71a70bd6582d995f6424fbbf4 , < 2ca9380b12711afe95b3589bd82b59623b3c96b3 (git)
Affected: fa96b57c149061f71a70bd6582d995f6424fbbf4 , < 51424fd171cee6a33f01f7c66b8eb23ac42289d4 (git)
Affected: fa96b57c149061f71a70bd6582d995f6424fbbf4 , < b49f085cd671addbda4802d6b9382513f7dd0f30 (git)
Affected: fa96b57c149061f71a70bd6582d995f6424fbbf4 , < bd51834d1cf65a2c801295d230c220aeebf87a73 (git)
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    Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.1.136 , ≤ 6.1.* (semver)
Unaffected: 6.6.89 , ≤ 6.6.* (semver)
Unaffected: 6.12.26 , ≤ 6.12.* (semver)
Unaffected: 6.14.5 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.