CVE-2025-37818 (GCVE-0-2025-37818)
Vulnerability from cvelistv5
Published
2025-05-08 06:26
Modified
2025-05-26 05:21
Severity ?
VLAI Severity ?
EPSS score ?
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
{
"containers": {
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{
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"product": "Linux",
"programFiles": [
"arch/loongarch/mm/hugetlbpage.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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{
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"programFiles": [
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],
"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"
},
{
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"status": "unaffected",
"version": "6.14.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.15",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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"cpeMatch": [
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"vulnerable": true
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"descriptions": [
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"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."
}
],
"providerMetadata": {
"dateUpdated": "2025-05-26T05:21:32.260Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/34256805720993e37adf6127371a1265aea8376a"
},
{
"url": "https://git.kernel.org/stable/c/2ca9380b12711afe95b3589bd82b59623b3c96b3"
},
{
"url": "https://git.kernel.org/stable/c/51424fd171cee6a33f01f7c66b8eb23ac42289d4"
},
{
"url": "https://git.kernel.org/stable/c/b49f085cd671addbda4802d6b9382513f7dd0f30"
},
{
"url": "https://git.kernel.org/stable/c/bd51834d1cf65a2c801295d230c220aeebf87a73"
}
],
"title": "LoongArch: Return NULL from huge_pte_offset() for invalid PMD",
"x_generator": {
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}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-37818",
"datePublished": "2025-05-08T06:26:13.322Z",
"dateReserved": "2025-04-16T04:51:23.947Z",
"dateUpdated": "2025-05-26T05:21:32.260Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
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"nvd": "{\"cve\":{\"id\":\"CVE-2025-37818\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-08T07:15:53.040\",\"lastModified\":\"2025-05-08T14:39:09.683\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2ca9380b12711afe95b3589bd82b59623b3c96b3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/34256805720993e37adf6127371a1265aea8376a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/51424fd171cee6a33f01f7c66b8eb23ac42289d4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b49f085cd671addbda4802d6b9382513f7dd0f30\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bd51834d1cf65a2c801295d230c220aeebf87a73\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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