CVE-2025-37818LoongArch: Return NULL from huge_pte_offset() for invalid PMD
- 5.5MediumCVSS base score
- 0.19%Exploitation in 30 daysEPSS · top 91% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 22 days later
· 22 days later
Published
- 12 months later
· 12 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
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.19% · top 91% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected fa96b57c149061f71a70bd6582d995f6424fbbf4 – < 34256805720993e37adf6127371a1265aea8376a
- affected fa96b57c149061f71a70bd6582d995f6424fbbf4 – < 2ca9380b12711afe95b3589bd82b59623b3c96b3
- affected fa96b57c149061f71a70bd6582d995f6424fbbf4 – < 51424fd171cee6a33f01f7c66b8eb23ac42289d4
- affected fa96b57c149061f71a70bd6582d995f6424fbbf4 – < b49f085cd671addbda4802d6b9382513f7dd0f30
- affected fa96b57c149061f71a70bd6582d995f6424fbbf4 – < bd51834d1cf65a2c801295d230c220aeebf87a73
- affected 5.19
- unaffected < 5.19
- unaffected 6.1.136 – ≤ 6.1.*
- unaffected 6.6.89 – ≤ 6.6.*
- unaffected 6.12.26 – ≤ 6.12.*
- unaffected 6.14.5 – ≤ 6.14.*
- unaffected 6.15 – ≤ *
References
References6
- https://git.kernel.org/stable/c/34256805720993e37adf6127371a1265aea8376a (opens in a new tab)
- https://git.kernel.org/stable/c/2ca9380b12711afe95b3589bd82b59623b3c96b3 (opens in a new tab)
- https://git.kernel.org/stable/c/51424fd171cee6a33f01f7c66b8eb23ac42289d4 (opens in a new tab)
- https://git.kernel.org/stable/c/b49f085cd671addbda4802d6b9382513f7dd0f30 (opens in a new tab)
- https://git.kernel.org/stable/c/bd51834d1cf65a2c801295d230c220aeebf87a73 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-13988 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-37818)Record last updated .