CVE-2026-90048 (GCVE-0-2026-90048)
Vulnerability from cvelistv5
Published
2026-09-16 10:33
Modified
2026-10-30 12:33
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list() ni_create_attr_list() allocates a fixed buffer of al_aligned(record_size) (== record_size) bytes and then walks every attribute of the primary MFT record, writing one ATTR_LIST_ENTRY per attribute and advancing the cursor by le_size(name_len), with no check against the end of the buffer; the total size is only computed after the loop. A minimum-size resident attribute occupies SIZEOF_RESIDENT (0x18 = 24) bytes on disk, but an unnamed attribute expands to le_size(0) (0x20 = 32) bytes in the list. Because the number of attributes in a record is not bounded (mi_enum_attr() accepts arbitrarily many equal-type, nameless minimum-size attributes), a crafted record packed with such attributes produces a list larger than record_size and overflows the heap buffer. This is reachable from a crafted, loop-mounted NTFS image: opening the file and adding an attribute (e.g. via setxattr) drives ntfs_set_ea() -> ni_insert_resident() -> ni_insert_attr() -> ni_ins_attr_ext() -> ni_create_attr_list(). BUG: KASAN: slab-out-of-bounds in ni_create_attr_list+0xc48/0x1058 Write of size 4 at addr ffff000008984c00 by task setfattr/345 ni_create_attr_list+0xc48/0x1058 ni_ins_attr_ext+0x510/0x7c0 ni_insert_attr+0x3f8/0x70c ni_insert_resident+0xc8/0x3b0 ntfs_set_ea+0x66c/0xd28 ntfs_setxattr+0x4d8/0x5b0 __arm64_sys_setxattr+0xa4/0x124 Allocated by task 345: ni_create_attr_list+0x188/0x1058 The buggy address belongs to the cache kmalloc-1k of size 1024 (the write lands at object+1024). Size the buffer from the actual attributes instead of assuming a single record_size is always enough.
References
Impacted products
Vendor Product Version
Linux Linux Version: 4342306f0f0d5ff4315a204d315c1b51b914fca5
Version: 4342306f0f0d5ff4315a204d315c1b51b914fca5
Version: 4342306f0f0d5ff4315a204d315c1b51b914fca5
Version: 4342306f0f0d5ff4315a204d315c1b51b914fca5
Version: 4342306f0f0d5ff4315a204d315c1b51b914fca5
Version: 4342306f0f0d5ff4315a204d315c1b51b914fca5
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs3/frecord.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs3/frecord.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.191",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
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                {
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                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()\n\nni_create_attr_list() allocates a fixed buffer of al_aligned(record_size)\n(== record_size) bytes and then walks every attribute of the primary MFT\nrecord, writing one ATTR_LIST_ENTRY per attribute and advancing the cursor\nby le_size(name_len), with no check against the end of the buffer; the\ntotal size is only computed after the loop.\n\nA minimum-size resident attribute occupies SIZEOF_RESIDENT (0x18 = 24)\nbytes on disk, but an unnamed attribute expands to le_size(0) (0x20 = 32)\nbytes in the list.  Because the number of attributes in a record is not\nbounded (mi_enum_attr() accepts arbitrarily many equal-type, nameless\nminimum-size attributes), a crafted record packed with such attributes\nproduces a list larger than record_size and overflows the heap buffer.\n\nThis is reachable from a crafted, loop-mounted NTFS image: opening the file\nand adding an attribute (e.g. via setxattr) drives ntfs_set_ea() -\u003e\nni_insert_resident() -\u003e ni_insert_attr() -\u003e ni_ins_attr_ext() -\u003e\nni_create_attr_list().\n\n  BUG: KASAN: slab-out-of-bounds in ni_create_attr_list+0xc48/0x1058\n  Write of size 4 at addr ffff000008984c00 by task setfattr/345\n   ni_create_attr_list+0xc48/0x1058\n   ni_ins_attr_ext+0x510/0x7c0\n   ni_insert_attr+0x3f8/0x70c\n   ni_insert_resident+0xc8/0x3b0\n   ntfs_set_ea+0x66c/0xd28\n   ntfs_setxattr+0x4d8/0x5b0\n   __arm64_sys_setxattr+0xa4/0x124\n  Allocated by task 345:\n   ni_create_attr_list+0x188/0x1058\n  The buggy address belongs to the cache kmalloc-1k of size 1024\n  (the write lands at object+1024).\n\nSize the buffer from the actual attributes instead of assuming a single\nrecord_size is always enough."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - ntfs3 registers export_operations, so ksmbd/nfsd VFS write and setxattr on an exported NTFS volume reach ni_create_attr_list() via ntfs_set_size/attr_set_size_ex and ntfs_setxattr\u2192ni_insert_resident\u2192ni_ins_attr_ext; NAS/router SMB sharing of USB NTFS is a reasonable high-impact path.\nAC:L - The attacker fully controls a primary MFT record packed with unnamed SIZEOF_RESIDENT attributes, so the ATTR_LIST_ENTRY walk overflows the fixed kzalloc(record_size) buffer on the first attribute insert or allocation extend; no race or attacker-uncontrollable layout is required.\nPR:N - Triggering needs only write or setxattr permission on the crafted file, including guest/anonymous SMB or a permissive NFS export; no local account, init-namespace root, or CAP_SYS_ADMIN is required on the trigger path.\nUI:N - Once the crafted NTFS volume is mounted and exported, or automounted from removable/shared storage, the attacker triggers the overflow with an ordinary write, truncate, or setxattr; no extra victim clicks, prompts, or confirmation are required.\nS:U - The slab out-of-bounds write corrupts kernel heap in the same host OS security authority as ntfs3; it can enable privilege escalation but does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The overflow writes attacker-controlled ATTR_LIST_ENTRY fields (type, name, id) past the kmalloc-1k object into adjacent slab, a heap-corruption primitive that can be leveraged for kernel memory disclosure.\nI:H - The unbounded ATTR_LIST_ENTRY walk is a slab out-of-bounds write of attacker-influenced attribute metadata into adjacent heap objects, enabling arbitrary kernel writes and potential control-flow hijack.\nA:H - KASAN reports a slab-out-of-bounds write in ni_create_attr_list(); overflowing the kmalloc object corrupts adjacent heap and causes a kernel oops, panic, or hang."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:33:58.173Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3a38f3c71bcd9bd58d86489c364bd29a4c2c860e"
        },
        {
          "url": "https://git.kernel.org/stable/c/7e9aee7e4d9767cc3e423b3beecb01c7ebb6bbcd"
        },
        {
          "url": "https://git.kernel.org/stable/c/fa2215cf451414b0512cd6f7d37a057893811f4d"
        },
        {
          "url": "https://git.kernel.org/stable/c/d07e281f2a7710502985d6f80b95ddac8f4e81d5"
        },
        {
          "url": "https://git.kernel.org/stable/c/a84f3db72561c4d9281c5ff721ce46b9ffa7f30e"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c4841e2a62794a3bab7c1ff0540580f387e377f"
        }
      ],
      "title": "fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90048",
    "datePublished": "2026-09-16T10:33:44.538Z",
    "dateReserved": "2026-09-11T19:38:34.783Z",
    "dateUpdated": "2026-10-30T12:33:58.173Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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