400 lines
20 KiB
JSON
400 lines
20 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-2026-46124",
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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": "2026-05-13T15:03:33.098Z",
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"datePublished": "2026-05-28T09:35:38.887Z",
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"dateUpdated": "2026-10-19T19:36:51.382Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:29:53.831Z"
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},
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"descriptions": [
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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\nisofs: validate block number from NFS file handle in isofs_export_iget\n\nisofs_fh_to_dentry() and isofs_fh_to_parent() pass an attacker-\ncontrolled block number (ifid->block or ifid->parent_block) from\nthe NFS file handle to isofs_export_iget(), which only rejects\nblock == 0 before calling isofs_iget() and ultimately sb_bread().\nA crafted file handle with fh_len sufficient to pass the check\nadded by commit 0405d4b63d08 (\"isofs: Prevent the use of too small\nfid\") can still drive the server to read any in-range block on the\nbacking device as if it were an iso_directory_record. That earlier\nfix was assigned CVE-2025-37780.\n\nsb_bread() on an out-of-range block returns NULL cleanly via the\nEIO path, so there is no memory-safety violation. For in-range\nreads of adjacent-partition data on the same block device, the\nunrelated bytes end up in iso_inode_info fields that reach the NFS\nclient as dentry metadata. The deployment surface (isofs exported\nover NFS from loop-mounted images) is narrow and requires an\nauthenticated NFS peer, but the malformed-file-handle class is\nreportable as hardening next to the existing CVE-2025-37780 fix.\n\nReject block >= ISOFS_SB(sb)->s_nzones in isofs_export_iget() so\nthe check covers both isofs_fh_to_dentry() and isofs_fh_to_parent()\ncall sites with a single line."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
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"baseScore": 7.5,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - The vulnerable code is reached when nfsd decodes an attacker-supplied NFS file handle (exportfs_decode_fh → isofs_fh_to_dentry), so a remote NFS client triggers it over the network (TCP/UDP 2049).\nAC:L - The attacker fully controls the block field in the file handle and the read is deterministic; no race or uncontrollable memory layout is involved.\nPR:N - The decode runs before per-user permission checks, and the realistic deployment (a read-only ISO exported to a subnet via default AUTH_SYS) lets any permitted network peer craft handles without credentials.\nUI:N - The NFS server processes the crafted request automatically; no victim action is required at attack time beyond the pre-existing export.\nS:U - The impact stays within the kernel filesystem/NFS security authority; no cross-authority boundary (VM, IOMMU, sandbox) is crossed.\nC:H - An out-of-bounds (cross-partition) read of arbitrary in-range blocks on the backing device is disclosed to the NFS client as inode metadata, and is not bounded to a few bytes since the attacker can probe blocks across the device.\nI:N - isofs is mounted strictly read-only and the commit confirms no memory-safety violation, so the attacker cannot modify any data or kernel memory.\nA:N - Out-of-range reads return NULL cleanly via the EIO path and in-range parsing is bounded; the commit and maintainer explicitly confirm no crash, hang, or memory-safety fault."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/isofs/export.c"
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],
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"status": "affected",
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},
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"status": "affected",
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},
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{
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},
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"lessThanOrEqual": "7.0.*",
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"url": "https://git.kernel.org/stable/c/24376458138387fb251e782e624c7776e9826796"
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}
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"title": "isofs: validate block number from NFS file handle in isofs_export_iget",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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} |