CVE-2026-90048 (GCVE-0-2026-90048)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:33 – Updated: 2026-10-30 12:33
VLAI
Title
fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6639 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4342306f0f0d5ff4315a204d315c1b51b914fca5 , < 3a38f3c71bcd9bd58d86489c364bd29a4c2c860e (git)
Affected: 4342306f0f0d5ff4315a204d315c1b51b914fca5 , < 7e9aee7e4d9767cc3e423b3beecb01c7ebb6bbcd (git)
Affected: 4342306f0f0d5ff4315a204d315c1b51b914fca5 , < fa2215cf451414b0512cd6f7d37a057893811f4d (git)
Affected: 4342306f0f0d5ff4315a204d315c1b51b914fca5 , < d07e281f2a7710502985d6f80b95ddac8f4e81d5 (git)
Affected: 4342306f0f0d5ff4315a204d315c1b51b914fca5 , < a84f3db72561c4d9281c5ff721ce46b9ffa7f30e (git)
Affected: 4342306f0f0d5ff4315a204d315c1b51b914fca5 , < 7c4841e2a62794a3bab7c1ff0540580f387e377f (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "programFiles": [
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          "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."
        }
      ],
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            "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"
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              "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."
            }
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        "dateUpdated": "2026-10-30T12:33:58.173Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        },
        {
          "url": "https://git.kernel.org/stable/c/7c4841e2a62794a3bab7c1ff0540580f387e377f"
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      ],
      "title": "fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()",
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    "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"
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      "cve": "CVE-2026-90048",
      "id": "msrc_CVE-2026-90048",
      "initial_release_date": "2026-09-17T01:10:13.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "2",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()",
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        "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."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfs/ntfs3: corrige escritura fuera de l\u00edmites de slab en ni_create_attr_list()\n\nni_create_attr_list() asigna un b\u00fafer fijo de al_aligned(record_size) (== record_size) bytes y luego recorre cada atributo del registro MFT primario, escribiendo una ATTR_LIST_ENTRY por atributo y avanzando el cursor por le_size(name_len), sin ninguna comprobaci\u00f3n contra el final del b\u00fafer; el tama\u00f1o total solo se calcula despu\u00e9s del bucle.\n\nUn atributo residente de tama\u00f1o m\u00ednimo ocupa SIZEOF_RESIDENT (0x18 = 24) bytes en disco, pero un atributo sin nombre se expande a le_size(0) (0x20 = 32) bytes en la lista. Debido a que el n\u00famero de atributos en un registro no est\u00e1 limitado (mi_enum_attr() acepta un n\u00famero arbitrario de atributos de tipo igual, sin nombre y de tama\u00f1o m\u00ednimo), un registro manipulado lleno de tales atributos produce una lista mayor que record_size y desborda el b\u00fafer del heap.\n\nEsto es alcanzable desde una imagen NTFS manipulada, montada en bucle: abrir el archivo y a\u00f1adir un atributo (p. ej., a trav\u00e9s de setxattr) impulsa ntfs_set_ea()  -\u003e  ni_insert_resident()  -\u003e  ni_insert_attr()  -\u003e  ni_ins_attr_ext()  -\u003e  ni_create_attr_list().\n\n  ERROR: KASAN: escritura fuera de l\u00edmites de slab en ni_create_attr_list+0xc48/0x1058\n  Escritura de tama\u00f1o 4 en la direcci\u00f3n ffff000008984c00 por la tarea 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  Asignado por la tarea 345:\n   ni_create_attr_list+0x188/0x1058\n  La direcci\u00f3n err\u00f3nea pertenece a la cach\u00e9 kmalloc-1k de tama\u00f1o 1024\n  (la escritura cae en object+1024).\n\nDimensionar el b\u00fafer a partir de los atributos reales en lugar de asumir que un \u00fanico record_size es siempre suficiente."
          }
        ],
        "id": "CVE-2026-90048",
        "lastModified": "2026-10-30T13:20:40.057",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-16T11:17:18.140",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3a38f3c71bcd9bd58d86489c364bd29a4c2c860e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7c4841e2a62794a3bab7c1ff0540580f387e377f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7e9aee7e4d9767cc3e423b3beecb01c7ebb6bbcd"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a84f3db72561c4d9281c5ff721ce46b9ffa7f30e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d07e281f2a7710502985d6f80b95ddac8f4e81d5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fa2215cf451414b0512cd6f7d37a057893811f4d"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-07T11:27:18+00:00",
      "cve": "CVE-2026-90048",
      "id": "CVE-2026-90048",
      "initial_release_date": "2026-09-16T00:00:00+00:00",
      "product_status:known_not_affected": "203",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90048.json",
      "version": "3"
    }
  }
}



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