FKIE_CVE-2025-37818
Vulnerability from fkie_nvd - Published: 2025-05-08 07:15 - Updated: 2026-06-17 09:15
Severity
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.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 6.15 | |
| linux | linux_kernel | 6.15 | |
| linux | linux_kernel | 6.15 | |
| debian | debian_linux | 11.0 |
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/loongarch/mm/hugetlbpage.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "34256805720993e37adf6127371a1265aea8376a",
"status": "affected",
"version": "fa96b57c149061f71a70bd6582d995f6424fbbf4",
"versionType": "git"
},
{
"lessThan": "2ca9380b12711afe95b3589bd82b59623b3c96b3",
"status": "affected",
"version": "fa96b57c149061f71a70bd6582d995f6424fbbf4",
"versionType": "git"
},
{
"lessThan": "51424fd171cee6a33f01f7c66b8eb23ac42289d4",
"status": "affected",
"version": "fa96b57c149061f71a70bd6582d995f6424fbbf4",
"versionType": "git"
},
{
"lessThan": "b49f085cd671addbda4802d6b9382513f7dd0f30",
"status": "affected",
"version": "fa96b57c149061f71a70bd6582d995f6424fbbf4",
"versionType": "git"
},
{
"lessThan": "bd51834d1cf65a2c801295d230c220aeebf87a73",
"status": "affected",
"version": "fa96b57c149061f71a70bd6582d995f6424fbbf4",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"arch/loongarch/mm/hugetlbpage.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.19"
},
{
"lessThan": "5.19",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.136",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.89",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.26",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.14.*",
"status": "unaffected",
"version": "6.14.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.15",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
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{
"nodes": [
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: Return NULL from huge_pte_offset() for invalid PMD\n\nLoongArch\u0027s huge_pte_offset() currently returns a pointer to a PMD slot\neven if the underlying entry points to invalid_pte_table (indicating no\nmapping). Callers like smaps_hugetlb_range() fetch this invalid entry\nvalue (the address of invalid_pte_table) via this pointer.\n\nThe generic is_swap_pte() check then incorrectly identifies this address\nas a swap entry on LoongArch, because it satisfies the \"!pte_present()\n\u0026\u0026 !pte_none()\" conditions. This misinterpretation, combined with a\ncoincidental match by is_migration_entry() on the address bits, leads to\nkernel crashes in pfn_swap_entry_to_page().\n\nFix this at the architecture level by modifying huge_pte_offset() to\ncheck the PMD entry\u0027s content using pmd_none() before returning. If the\nentry is invalid (i.e., it points to invalid_pte_table), return NULL\ninstead of the pointer to the slot."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: LoongArch: Devuelve NULL desde huge_pte_offset() para PMD no v\u00e1lido. La funci\u00f3n huge_pte_offset() de LoongArch actualmente devuelve un puntero a una ranura PMD incluso si la entrada subyacente apunta a invalid_pte_table (lo que indica que no hay asignaci\u00f3n). Llamadores como smaps_hugetlb_range() obtienen este valor de entrada no v\u00e1lido (la direcci\u00f3n de invalid_pte_table) a trav\u00e9s de este puntero. La comprobaci\u00f3n gen\u00e9rica is_swap_pte() identifica incorrectamente esta direcci\u00f3n como una entrada de intercambio en LoongArch, ya que cumple las condiciones \"!pte_present() \u0026amp;\u0026amp; !pte_none()\". Esta interpretaci\u00f3n err\u00f3nea, combinada con una coincidencia de is_migration_entry() en los bits de direcci\u00f3n, provoca fallos del kernel en pfn_swap_entry_to_page(). Solucione esto a nivel de arquitectura modificando huge_pte_offset() para comprobar el contenido de la entrada PMD mediante pmd_none() antes de regresar. Si la entrada no es v\u00e1lida (es decir, apunta a invalid_pte_table), devuelva NULL en lugar del puntero a la ranura."
}
],
"id": "CVE-2025-37818",
"lastModified": "2026-06-17T09:15:30.080",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2025-05-08T07:15:53.040",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/2ca9380b12711afe95b3589bd82b59623b3c96b3"
},
{
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"tags": [
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"url": "https://git.kernel.org/stable/c/34256805720993e37adf6127371a1265aea8376a"
},
{
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"url": "https://git.kernel.org/stable/c/51424fd171cee6a33f01f7c66b8eb23ac42289d4"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/b49f085cd671addbda4802d6b9382513f7dd0f30"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-476"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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- 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.
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vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
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They have not been verified by an analyst and are provided for guidance only.
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Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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