526 lines
24 KiB
JSON
526 lines
24 KiB
JSON
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-31447",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-03-09T15:48:24.091Z",
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"datePublished": "2026-04-22T13:53:43.467Z",
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"dateUpdated": "2026-11-10T12:44:21.287Z"
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},
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: reject mount if bigalloc with s_first_data_block != 0\n\nbigalloc with s_first_data_block != 0 is not supported, reject mounting\nit."
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"value": "AV:L - The vulnerable ext4 code is reached through local filesystem mount and file-operation paths on an attacker-controlled ext4 image or block device, not through a network protocol.\nAC:L - The attacker controls the filesystem geometry and extent layout, and the reported trigger is deterministic after mounting and operating on the crafted filesystem; no race or external timing condition is required.\nPR:N - Direct mounting is gated by CAP_SYS_ADMIN in the initial user namespace because ext4 lacks FS_USERNS_MOUNT, but in the attacker-supplied filesystem scenario the privileged mount is performed by the victim or system automounter. The attacker does not need their own kernel privileges.\nUI:R - Exploitation requires a victim or privileged mounting path to mount the crafted ext4 filesystem and perform an operation such as unlink/truncate on it.\nS:U - The impact remains within the kernel/filesystem security authority; this is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The bug is a use-after-free in ext4 extent metadata handling, and UAF conditions can expose reused memory contents or be shaped into broader kernel information disclosure.\nI:H - The faulty cluster arithmetic can free and reuse metadata blocks still referenced by extents, creating memory/filesystem metadata corruption that is defensibly exploitable for high-integrity impact.\nA:H - The observed failure is a KASAN use-after-free in ext4_ext_remove_space and can crash or destabilize the kernel, giving high availability impact."
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"type": "ssvc",
|
|
"content": {
|
|
"id": "CVE-2026-31447",
|
|
"role": "CISA Coordinator",
|
|
"options": [
|
|
{
|
|
"Exploitation": "none"
|
|
},
|
|
{
|
|
"Automatable": "no"
|
|
},
|
|
{
|
|
"Technical Impact": "total"
|
|
}
|
|
],
|
|
"version": "2.0.3",
|
|
"timestamp": "2026-10-16T15:09:23.320699Z"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"problemTypes": [
|
|
{
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"type": "CWE",
|
|
"cweId": "CWE-20",
|
|
"description": "CWE-20 Improper Input Validation"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"title": "CISA ADP Vulnrichment",
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2026-10-19T18:35:48.523Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |