CVE-2026-98136
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: ntfs: bound $AttrDef table walk to the loaded table size ntfs_attr_find_in_attrdef() walks the in-memory $AttrDef table, but the loop condition bounds only the start of each entry, not the whole entry: for (ad = vol->attrdef; (u8 *)ad - (u8 *)vol->attrdef < vol->attrdef_size && ad->type; ++ad) struct attr_def is 160 bytes; the guard reads ad->type at offset 128 and the loop body reads further fields. vol->attrdef is kvzalloc(i_size), where i_size is the on-disk $AttrDef data size, checked in load_and_init_attrdef() only as 0 < i_size <= 0x7fffffff. A volume whose $AttrDef data size is smaller than one entry (e.g. 120 bytes) makes the read of ad->type run past the allocation. Creating a file reaches this through ntfs_attr_size_bounds_check() and reads out of bounds: BUG: KASAN: slab-out-of-bounds in ntfs_attr_find_in_attrdef+0x66/0xa0 Read of size 4 at addr ffff888005833280 by task init/1 ntfs_attr_find_in_attrdef ntfs_attr_size_bounds_check ntfs_attr_can_be_non_resident ntfs_attr_add Require the whole entry to lie within attrdef_size in the loop guard, and reject at mount a $AttrDef too small to hold one attr_def entry.
View original CVE JSON
{
"id": "CVE-2026-98136",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-09-25T11:17:45.043",
"lastModified": "2026-10-19T10:18:12.787",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: bound $AttrDef table walk to the loaded table size\n\nntfs_attr_find_in_attrdef() walks the in-memory $AttrDef table, but the\nloop condition bounds only the start of each entry, not the whole entry:\n\n\tfor (ad = vol->attrdef; (u8 *)ad - (u8 *)vol->attrdef <\n\t\t\tvol->attrdef_size && ad->type; ++ad)\n\nstruct attr_def is 160 bytes; the guard reads ad->type at offset 128 and\nthe loop body reads further fields. vol->attrdef is kvzalloc(i_size),\nwhere i_size is the on-disk $AttrDef data size, checked in\nload_and_init_attrdef() only as 0 < i_size <= 0x7fffffff. A volume whose\n$AttrDef data size is smaller than one entry (e.g. 120 bytes) makes the\nread of ad->type run past the allocation. Creating a file reaches this\nthrough ntfs_attr_size_bounds_check() and reads out of bounds:\n\n BUG: KASAN: slab-out-of-bounds in ntfs_attr_find_in_attrdef+0x66/0xa0\n Read of size 4 at addr ffff888005833280 by task init/1\n ntfs_attr_find_in_attrdef\n ntfs_attr_size_bounds_check\n ntfs_attr_can_be_non_resident\n ntfs_attr_add\n\nRequire the whole entry to lie within attrdef_size in the loop guard, and\nreject at mount a $AttrDef too small to hold one attr_def entry."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"fs/ntfs/attrib.c",
"fs/ntfs/super.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "1e9ea7e04472d4e5e12e58c881eaacfb3e49b669",
"lessThan": "3e2ae47b8ebc632c27e7843a4632d9a7c060885e",
"versionType": "git",
"status": "affected"
},
{
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"lessThan": "c8504fc1245f5322af5fa5c325ab05f9cf792b87",
"versionType": "git",
"status": "affected"
}
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},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"fs/ntfs/attrib.c",
"fs/ntfs/super.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "7.1",
"status": "affected"
},
{
"version": "0",
"lessThan": "7.1",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.7",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Primary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 5.2
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "CWE-125"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "7.1",
"versionEndExcluding": "7.2.7",
"matchCriteriaId": "14D603E7-156F-4FD7-926F-F8D893FBAD60"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:7.3:rc1:*:*:*:*:*:*",
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"references": [
{
"url": "https://git.kernel.org/stable/c/3e2ae47b8ebc632c27e7843a4632d9a7c060885e",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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{
"url": "https://git.kernel.org/stable/c/c8504fc1245f5322af5fa5c325ab05f9cf792b87",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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}
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}