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CVE-2026-97438

Estado: RecibidaAlta (7.1)—

In the Linux kernel, the following vulnerability has been resolved:

fs/ntfs3: validate index entry key bounds

[BUG] A malformed NTFS directory index entry can advertise a key_size larger than the bytes actually present in its NTFS_DE payload. Directory lookup then passes that malformed key to cmp_fnames(), which can read past the end of the kmalloc'ed index buffer.

[CAUSE] The index-header validators only validated INDEX_HDR-level geometry. They did not walk each NTFS_DE to verify entry alignment, subnode layout, or that key_size fit inside the entry payload. They also allowed a last sentinel entry to carry a non-zero key_size.

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[FIX] Walk every NTFS_DE in ntfs3's index-header validators and reject entries with invalid layout, mismatched subnode state, oversized key_size, or non-zero sentinel keys before lookup or log replay can consume them.

Detalles técnicos trazas, registros y código del informe original
BUG: KASAN: slab-out-of-bounds in fname_full_size fs/ntfs3/ntfs.h:590 [inline]
BUG: KASAN: slab-out-of-bounds in cmp_fnames+0x1ea/0x230 fs/ntfs3/index.c:46
Read of size 1 at addr ffff88801c313018 by task syz.6.3365/9279

Call Trace:
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0xbe/0x130 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xd1/0x650 mm/kasan/report.c:482
 kasan_report+0xfb/0x140 mm/kasan/report.c:595
 __asan_report_load1_noabort+0x14/0x30 mm/kasan/report_generic.c:378
 fname_full_size fs/ntfs3/ntfs.h:590 [inline]
 cmp_fnames+0x1ea/0x230 fs/ntfs3/index.c:46
 hdr_find_e.isra.0+0x3ed/0x670 fs/ntfs3/index.c:762
 indx_find+0x4b5/0x900 fs/ntfs3/index.c:1186
 dir_search_u+0x2c0/0x460 fs/ntfs3/dir.c:254
 ntfs_lookup+0x1cc/0x2a0 fs/ntfs3/namei.c:85
 __lookup_slow+0x241/0x450 fs/namei.c:1816
 lookup_slow fs/namei.c:1833 [inline]
 walk_component+0x31c/0x570 fs/namei.c:2151
 link_path_walk+0x592/0xd60 fs/namei.c:2519
 path_lookupat+0x138/0x660 fs/namei.c:2675
 filename_lookup+0x1f3/0x560 fs/namei.c:2705
 filename_setxattr+0xad/0x1c0 fs/xattr.c:660
 path_setxattrat+0x1d8/0x280 fs/xattr.c:713
 __do_sys_lsetxattr fs/xattr.c:754 [inline]
 __se_sys_lsetxattr fs/xattr.c:750 [inline]
 __x64_sys_lsetxattr+0xd0/0x150 fs/xattr.c:750
 ...

Allocated by task 9279:
 kasan_save_stack+0x39/0x70 mm/kasan/common.c:56
 kasan_save_track+0x14/0x40 mm/kasan/common.c:77
 kasan_save_alloc_info+0x37/0x60 mm/kasan/generic.c:573
 poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
 __kasan_kmalloc+0xc3/0xd0 mm/kasan/common.c:417
 kasan_kmalloc include/linux/kasan.h:262 [inline]
 __do_kmalloc_node mm/slub.c:5650 [inline]
 __kmalloc_noprof+0x2bd/0x900 mm/slub.c:5662
 kmalloc_noprof include/linux/slab.h:961 [inline]
 indx_read+0x41d/0xad0 fs/ntfs3/index.c:1059
 indx_find+0x447/0x900 fs/ntfs3/index.c:1179
 dir_search_u+0x2c0/0x460 fs/ntfs3/dir.c:254
 ntfs_lookup+0x1cc/0x2a0 fs/ntfs3/namei.c:85
 __lookup_slow+0x241/0x450 fs/namei.c:1816
 lookup_slow fs/namei.c:1833 [inline]
 walk_component+0x31c/0x570 fs/namei.c:2151
 link_path_walk+0x592/0xd60 fs/namei.c:2519
 path_lookupat+0x138/0x660 fs/namei.c:2675
 filename_lookup+0x1f3/0x560 fs/namei.c:2705
 filename_setxattr+0xad/0x1c0 fs/xattr.c:660
 path_setxattrat+0x1d8/0x280 fs/xattr.c:713
 __do_sys_lsetxattr fs/xattr.c:754 [inline]
 __se_sys_lsetxattr fs/xattr.c:750 [inline]
 __x64_sys_lsetxattr+0xd0/0x150 fs/xattr.c:750
 ...

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad de lectura fuera de límites en kernel NTFS3 activada por entrada de directorio malformada local (AV:L, UI:R). Causa DoS (crash) y potencial fuga de memoria kernel.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network TrafficApplication Isolation and SandboxingExploit ProtectionUpdate SoftwareData Loss Prevention

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-97438",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.1,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "82cae269cfa953032fbb8980a7d554d60fb00b17",
              "lessThan": "c8d93bc4823baecab3c39b877e16ac5f8d4d41ba",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "82cae269cfa953032fbb8980a7d554d60fb00b17",
              "lessThan": "7feeb424bda7f6ffaf5090cdd01b300eaa74c02b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "82cae269cfa953032fbb8980a7d554d60fb00b17",
              "lessThan": "d564a885219a655077eefafeb72395a4580ebd69",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "82cae269cfa953032fbb8980a7d554d60fb00b17",
              "lessThan": "a8f4fb6a7d58974ffc9aed597401528b181d76dc",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "82cae269cfa953032fbb8980a7d554d60fb00b17",
              "lessThan": "0257e3ea00e19129f3ad5c039d8b8fdff0796835",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "82cae269cfa953032fbb8980a7d554d60fb00b17",
              "lessThan": "98d6e5d9dc1d34dcffc61549617581a5fe1ef807",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/ntfs3/fslog.c",
            "fs/ntfs3/index.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.15",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/ntfs3/fslog.c",
            "fs/ntfs3/index.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-24T17:17:21.930",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0257e3ea00e19129f3ad5c039d8b8fdff0796835",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7feeb424bda7f6ffaf5090cdd01b300eaa74c02b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/98d6e5d9dc1d34dcffc61549617581a5fe1ef807",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a8f4fb6a7d58974ffc9aed597401528b181d76dc",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c8d93bc4823baecab3c39b877e16ac5f8d4d41ba",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d564a885219a655077eefafeb72395a4580ebd69",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: validate index entry key bounds\n\n[BUG]\nA malformed NTFS directory index entry can advertise a key_size larger\nthan the bytes actually present in its NTFS_DE payload. Directory lookup\nthen passes that malformed key to cmp_fnames(), which can read past the\nend of the kmalloc'ed index buffer.\n\nBUG: KASAN: slab-out-of-bounds in fname_full_size fs/ntfs3/ntfs.h:590 [inline]\nBUG: KASAN: slab-out-of-bounds in cmp_fnames+0x1ea/0x230 fs/ntfs3/index.c:46\nRead of size 1 at addr ffff88801c313018 by task syz.6.3365/9279\n\nCall Trace:\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0xbe/0x130 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0xd1/0x650 mm/kasan/report.c:482\n kasan_report+0xfb/0x140 mm/kasan/report.c:595\n __asan_report_load1_noabort+0x14/0x30 mm/kasan/report_generic.c:378\n fname_full_size fs/ntfs3/ntfs.h:590 [inline]\n cmp_fnames+0x1ea/0x230 fs/ntfs3/index.c:46\n hdr_find_e.isra.0+0x3ed/0x670 fs/ntfs3/index.c:762\n indx_find+0x4b5/0x900 fs/ntfs3/index.c:1186\n dir_search_u+0x2c0/0x460 fs/ntfs3/dir.c:254\n ntfs_lookup+0x1cc/0x2a0 fs/ntfs3/namei.c:85\n __lookup_slow+0x241/0x450 fs/namei.c:1816\n lookup_slow fs/namei.c:1833 [inline]\n walk_component+0x31c/0x570 fs/namei.c:2151\n link_path_walk+0x592/0xd60 fs/namei.c:2519\n path_lookupat+0x138/0x660 fs/namei.c:2675\n filename_lookup+0x1f3/0x560 fs/namei.c:2705\n filename_setxattr+0xad/0x1c0 fs/xattr.c:660\n path_setxattrat+0x1d8/0x280 fs/xattr.c:713\n __do_sys_lsetxattr fs/xattr.c:754 [inline]\n __se_sys_lsetxattr fs/xattr.c:750 [inline]\n __x64_sys_lsetxattr+0xd0/0x150 fs/xattr.c:750\n ...\n\nAllocated by task 9279:\n kasan_save_stack+0x39/0x70 mm/kasan/common.c:56\n kasan_save_track+0x14/0x40 mm/kasan/common.c:77\n kasan_save_alloc_info+0x37/0x60 mm/kasan/generic.c:573\n poison_kmalloc_redzone mm/kasan/common.c:400 [inline]\n __kasan_kmalloc+0xc3/0xd0 mm/kasan/common.c:417\n kasan_kmalloc include/linux/kasan.h:262 [inline]\n __do_kmalloc_node mm/slub.c:5650 [inline]\n __kmalloc_noprof+0x2bd/0x900 mm/slub.c:5662\n kmalloc_noprof include/linux/slab.h:961 [inline]\n indx_read+0x41d/0xad0 fs/ntfs3/index.c:1059\n indx_find+0x447/0x900 fs/ntfs3/index.c:1179\n dir_search_u+0x2c0/0x460 fs/ntfs3/dir.c:254\n ntfs_lookup+0x1cc/0x2a0 fs/ntfs3/namei.c:85\n __lookup_slow+0x241/0x450 fs/namei.c:1816\n lookup_slow fs/namei.c:1833 [inline]\n walk_component+0x31c/0x570 fs/namei.c:2151\n link_path_walk+0x592/0xd60 fs/namei.c:2519\n path_lookupat+0x138/0x660 fs/namei.c:2675\n filename_lookup+0x1f3/0x560 fs/namei.c:2705\n filename_setxattr+0xad/0x1c0 fs/xattr.c:660\n path_setxattrat+0x1d8/0x280 fs/xattr.c:713\n __do_sys_lsetxattr fs/xattr.c:754 [inline]\n __se_sys_lsetxattr fs/xattr.c:750 [inline]\n __x64_sys_lsetxattr+0xd0/0x150 fs/xattr.c:750\n ...\n\n[CAUSE]\nThe index-header validators only validated INDEX_HDR-level geometry.\nThey did not walk each NTFS_DE to verify entry alignment, subnode\nlayout, or that key_size fit inside the entry payload. They also\nallowed a last sentinel entry to carry a non-zero key_size.\n\n[FIX]\nWalk every NTFS_DE in ntfs3's index-header validators and reject\nentries with invalid layout, mismatched subnode state, oversized\nkey_size, or non-zero sentinel keys before lookup or log replay can\nconsume them."
    }
  ],
  "lastModified": "2026-10-03T11:17:55.350",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}