CVE-2026-46124
Estado: En análisisAlta (7.5)—
In the Linux kernel, the following vulnerability has been resolved:
isofs: validate block number from NFS file handle in isofs_export_iget
isofs_fh_to_dentry() and isofs_fh_to_parent() pass an attacker- controlled block number (ifid->block or ifid->parent_block) from the NFS file handle to isofs_export_iget(), which only rejects block == 0 before calling isofs_iget() and ultimately sb_bread(). A crafted file handle with fh_len sufficient to pass the check added by commit 0405d4b63d08 ("isofs: Prevent the use of too small fid") can still drive the server to read any in-range block on the backing device as if it were an iso_directory_record. That earlier fix was assigned CVE-2025-37780.
Leer descripción completaMostrar menos
sb_bread() on an out-of-range block returns NULL cleanly via the EIO path, so there is no memory-safety violation. For in-range reads of adjacent-partition data on the same block device, the unrelated bytes end up in iso_inode_info fields that reach the NFS client as dentry metadata. The deployment surface (isofs exported over NFS from loop-mounted images) is narrow and requires an authenticated NFS peer, but the malformed-file-handle class is reportable as hardening next to the existing CVE-2025-37780 fix.
Reject block >= ISOFS_SB(sb)->s_nzones in isofs_export_iget() so the check covers both isofs_fh_to_dentry() and isofs_fh_to_parent() call sites with a single line.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Puntuación base: 7.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.58%
- Percentil entre todas las CVEs puntuadas: 46
- Fecha de la puntuación: 5/10/2026
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.
- Explotación
T1190Exploit Public-Facing Applicationinitial access75 % - Impacto principal
T1005Data from Local Systemcollection70 %
Acceso remoto a datos (NFS) sin autenticación requerida por vector AV:N/PR:N/UI:N; lectura de bloques arbitrarios del dispositivo como violación de confidencialidad (C:H).
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
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/0a1af74ae2177bda3aee0837a0546309aa539d0d
- https://git.kernel.org/stable/c/24376458138387fb251e782e624c7776e9826796
- https://git.kernel.org/stable/c/31dbb4ba0f719ae7774e4c0c95172c9bf81692f5
- https://git.kernel.org/stable/c/4c721a1d9b3c4fcaf59cc9b2281e3ec5a043e1a6
- https://git.kernel.org/stable/c/908a76f0b1038035e6ebb4f2293ce079f92e0a02
- https://git.kernel.org/stable/c/afbafeddf23db13fe2edb2d5c0bf4bbb13d7881b
- https://git.kernel.org/stable/c/bb0988ed4f2e26d59bbb58f644cb3a55b7521e21
- https://git.kernel.org/stable/c/ee0024f5a7e3c73aa253869fae9650ae054093ca
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-46124",
"cveTags": [],
"metrics": {
"cvssMetricV31": [
{
"type": "Secondary",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.5,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "NONE",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
},
"impactScore": 3.6,
"exploitabilityScore": 3.9
}
]
},
"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": "5e7de55602c61c8ff28db075cc49c8dd6989d7e0",
"lessThan": "ee0024f5a7e3c73aa253869fae9650ae054093ca",
"versionType": "git"
},
{
"status": "affected",
"version": "63d5a3e207bf315a32c7d16de6c89753a759f95a",
"lessThan": "31dbb4ba0f719ae7774e4c0c95172c9bf81692f5",
"versionType": "git"
},
{
"status": "affected",
"version": "0fdafdaef796816a9ed0fd7ac812932d569d9beb",
"lessThan": "908a76f0b1038035e6ebb4f2293ce079f92e0a02",
"versionType": "git"
},
{
"status": "affected",
"version": "952e7a7e317f126d0a2b879fc531b716932d5ffa",
"lessThan": "bb0988ed4f2e26d59bbb58f644cb3a55b7521e21",
"versionType": "git"
},
{
"status": "affected",
"version": "56dfffea9fd3be0b3795a9ca6401e133a8427e0b",
"lessThan": "0a1af74ae2177bda3aee0837a0546309aa539d0d",
"versionType": "git"
},
{
"status": "affected",
"version": "0405d4b63d082861f4eaff9d39c78ee9dc34f845",
"lessThan": "afbafeddf23db13fe2edb2d5c0bf4bbb13d7881b",
"versionType": "git"
},
{
"status": "affected",
"version": "0405d4b63d082861f4eaff9d39c78ee9dc34f845",
"lessThan": "4c721a1d9b3c4fcaf59cc9b2281e3ec5a043e1a6",
"versionType": "git"
},
{
"status": "affected",
"version": "0405d4b63d082861f4eaff9d39c78ee9dc34f845",
"lessThan": "24376458138387fb251e782e624c7776e9826796",
"versionType": "git"
},
{
"status": "affected",
"version": "ee01a309ebf598be1ff8174901ed6e91619f1749",
"versionType": "git"
},
{
"status": "affected",
"version": "007124c896e7d4614ac1f6bd4dedb975c35a2a8e",
"versionType": "git"
},
{
"status": "affected",
"version": "5.10.237",
"lessThan": "5.10.258",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.181",
"lessThan": "5.15.209",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.135",
"lessThan": "6.1.175",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.88",
"lessThan": "6.6.140",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.12.25",
"lessThan": "6.12.88",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.4.293",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.14.4",
"lessThan": "6.15",
"versionType": "semver"
}
],
"programFiles": [
"fs/isofs/export.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.258",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.140",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.88",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.30",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.7",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/isofs/export.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-05-28T10:16:27.920",
"references": [
{
"url": "https://git.kernel.org/stable/c/0a1af74ae2177bda3aee0837a0546309aa539d0d",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/24376458138387fb251e782e624c7776e9826796",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/31dbb4ba0f719ae7774e4c0c95172c9bf81692f5",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/4c721a1d9b3c4fcaf59cc9b2281e3ec5a043e1a6",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/908a76f0b1038035e6ebb4f2293ce079f92e0a02",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/afbafeddf23db13fe2edb2d5c0bf4bbb13d7881b",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/bb0988ed4f2e26d59bbb58f644cb3a55b7521e21",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ee0024f5a7e3c73aa253869fae9650ae054093ca",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Undergoing Analysis",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
]
}
],
"descriptions": [
{
"lang": "en",
"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."
}
],
"lastModified": "2026-06-24T16:51:14.923",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "4D6F83CA-7E5C-4A91-9D8C-71CC85535E7D",
"versionEndExcluding": "5.5",
"versionStartIncluding": "5.4.293"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "D8832159-E9F2-4E3A-869E-F397B4D75488",
"versionEndExcluding": "5.10.258",
"versionStartIncluding": "5.10.237"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "319819D2-533D-4AE6-8CE2-84C6808BA7CB",
"versionEndExcluding": "5.15.209",
"versionStartIncluding": "5.15.181"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "AB26E4C3-EF6C-4A53-AD49-F12E5001AEFB",
"versionEndExcluding": "6.1.175",
"versionStartIncluding": "6.1.135"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "78409D7B-A51C-439C-AF2E-F5FAF6F02BDC",
"versionEndExcluding": "6.6.140",
"versionStartIncluding": "6.6.88"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "AAED5477-21D0-4771-AF56-C4AC881021BC",
"versionEndExcluding": "6.12.88",
"versionStartIncluding": "6.12.25"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "786E593C-5048-4AE0-9421-71BE44AB6058",
"versionEndExcluding": "6.15",
"versionStartIncluding": "6.14.4"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "5E3FC740-6BC4-42A2-9F5A-712E2A27869A",
"versionEndExcluding": "6.18.30",
"versionStartIncluding": "6.15.1"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "D0893CA7-9AE6-4DFE-AC75-48967D73AD8E",
"versionEndExcluding": "7.0.7",
"versionStartIncluding": "6.19"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:-:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "A1ECC65A-EE37-4479-8E99-4BB68A22A31F"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "13FC0DDE-E513-465E-9E81-515702D49B74"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc4:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "8C7B5B0E-4EEB-48F5-B4CF-0935A7633845"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc5:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "2D240580-3048-49B2-9E27-F115A9DF8224"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc6:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "90320558-E553-4EF5-8A0B-0F5D20113BD2"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc7:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "C300BA32-5854-4B59-A00A-18A402F291D0"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}