Vulnerability-Lookup

EUVD-2026-348014

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 08:16

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

JSON

To clipboard

{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T08:16:44.240567+00:00",
  "id": "EUVD-2026-348014"
}

CVE-2026-46124 (GCVE-0-2026-46124)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:35 – Updated: 2026-08-05 12:29

Title

isofs: validate block number from NFS file handle in isofs_export_iget

Summary

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. 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.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/ee0024f5a7e3c73aa…
https://git.kernel.org/stable/c/31dbb4ba0f719ae77…
https://git.kernel.org/stable/c/908a76f0b1038035e…
https://git.kernel.org/stable/c/bb0988ed4f2e26d59…
https://git.kernel.org/stable/c/0a1af74ae2177bda3…
https://git.kernel.org/stable/c/afbafeddf23db13fe…
https://git.kernel.org/stable/c/4c721a1d9b3c4fcaf…
https://git.kernel.org/stable/c/24376458138387fb2…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 5e7de55602c61c8ff28db075cc49c8dd6989d7e0 , < ee0024f5a7e3c73aa253869fae9650ae054093ca (git) Affected: 63d5a3e207bf315a32c7d16de6c89753a759f95a , < 31dbb4ba0f719ae7774e4c0c95172c9bf81692f5 (git) Affected: 0fdafdaef796816a9ed0fd7ac812932d569d9beb , < 908a76f0b1038035e6ebb4f2293ce079f92e0a02 (git) Affected: 952e7a7e317f126d0a2b879fc531b716932d5ffa , < bb0988ed4f2e26d59bbb58f644cb3a55b7521e21 (git) Affected: 56dfffea9fd3be0b3795a9ca6401e133a8427e0b , < 0a1af74ae2177bda3aee0837a0546309aa539d0d (git) Affected: 0405d4b63d082861f4eaff9d39c78ee9dc34f845 , < afbafeddf23db13fe2edb2d5c0bf4bbb13d7881b (git) Affected: 0405d4b63d082861f4eaff9d39c78ee9dc34f845 , < 4c721a1d9b3c4fcaf59cc9b2281e3ec5a043e1a6 (git) Affected: 0405d4b63d082861f4eaff9d39c78ee9dc34f845 , < 24376458138387fb251e782e624c7776e9826796 (git) Affected: ee01a309ebf598be1ff8174901ed6e91619f1749 (git) Affected: 007124c896e7d4614ac1f6bd4dedb975c35a2a8e (git) Affected: 5.10.237 , < 5.10.258 (semver) Affected: 5.15.181 , < 5.15.209 (semver) Affected: 6.1.135 , < 6.1.175 (semver) Affected: 6.6.88 , < 6.6.140 (semver) Affected: 6.12.25 , < 6.12.88 (semver) Affected: 5.4.293 , < 5.5 (semver) Affected: 6.14.4 , < 6.15 (semver)
Linux	Linux	Affected: 6.15 Unaffected: 0 , < 6.15 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.88 , ≤ 6.12.* (semver) Unaffected: 6.18.30 , ≤ 6.18.* (semver) Unaffected: 7.0.7 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/isofs/export.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ee0024f5a7e3c73aa253869fae9650ae054093ca",
              "status": "affected",
              "version": "5e7de55602c61c8ff28db075cc49c8dd6989d7e0",
              "versionType": "git"
            },
            {
              "lessThan": "31dbb4ba0f719ae7774e4c0c95172c9bf81692f5",
              "status": "affected",
              "version": "63d5a3e207bf315a32c7d16de6c89753a759f95a",
              "versionType": "git"
            },
            {
              "lessThan": "908a76f0b1038035e6ebb4f2293ce079f92e0a02",
              "status": "affected",
              "version": "0fdafdaef796816a9ed0fd7ac812932d569d9beb",
              "versionType": "git"
            },
            {
              "lessThan": "bb0988ed4f2e26d59bbb58f644cb3a55b7521e21",
              "status": "affected",
              "version": "952e7a7e317f126d0a2b879fc531b716932d5ffa",
              "versionType": "git"
            },
            {
              "lessThan": "0a1af74ae2177bda3aee0837a0546309aa539d0d",
              "status": "affected",
              "version": "56dfffea9fd3be0b3795a9ca6401e133a8427e0b",
              "versionType": "git"
            },
            {
              "lessThan": "afbafeddf23db13fe2edb2d5c0bf4bbb13d7881b",
              "status": "affected",
              "version": "0405d4b63d082861f4eaff9d39c78ee9dc34f845",
              "versionType": "git"
            },
            {
              "lessThan": "4c721a1d9b3c4fcaf59cc9b2281e3ec5a043e1a6",
              "status": "affected",
              "version": "0405d4b63d082861f4eaff9d39c78ee9dc34f845",
              "versionType": "git"
            },
            {
              "lessThan": "24376458138387fb251e782e624c7776e9826796",
              "status": "affected",
              "version": "0405d4b63d082861f4eaff9d39c78ee9dc34f845",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ee01a309ebf598be1ff8174901ed6e91619f1749",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "007124c896e7d4614ac1f6bd4dedb975c35a2a8e",
              "versionType": "git"
            },
            {
              "lessThan": "5.10.258",
              "status": "affected",
              "version": "5.10.237",
              "versionType": "semver"
            },
            {
              "lessThan": "5.15.209",
              "status": "affected",
              "version": "5.15.181",
              "versionType": "semver"
            },
            {
              "lessThan": "6.1.175",
              "status": "affected",
              "version": "6.1.135",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6.140",
              "status": "affected",
              "version": "6.6.88",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12.88",
              "status": "affected",
              "version": "6.12.25",
              "versionType": "semver"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.293",
              "versionType": "semver"
            },
            {
              "lessThan": "6.15",
              "status": "affected",
              "version": "6.14.4",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/isofs/export.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.140",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.88",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.258",
                  "versionStartIncluding": "5.10.237",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.209",
                  "versionStartIncluding": "5.15.181",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.175",
                  "versionStartIncluding": "6.1.135",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.140",
                  "versionStartIncluding": "6.6.88",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.88",
                  "versionStartIncluding": "6.12.25",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.30",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.7",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.4.293",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.14.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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-\u003eblock or ifid-\u003eparent_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 \u003e= ISOFS_SB(sb)-\u003es_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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable code is reached when nfsd decodes an attacker-supplied NFS file handle (exportfs_decode_fh \u2192 isofs_fh_to_dentry), so a remote NFS client triggers it over the network (TCP/UDP 2049).\nAC:L - The attacker fully controls the block field in the file handle and the read is deterministic; no race or uncontrollable memory layout is involved.\nPR:N - The decode runs before per-user permission checks, and the realistic deployment (a read-only ISO exported to a subnet via default AUTH_SYS) lets any permitted network peer craft handles without credentials.\nUI:N - The NFS server processes the crafted request automatically; no victim action is required at attack time beyond the pre-existing export.\nS:U - The impact stays within the kernel filesystem/NFS security authority; no cross-authority boundary (VM, IOMMU, sandbox) is crossed.\nC:H - An out-of-bounds (cross-partition) read of arbitrary in-range blocks on the backing device is disclosed to the NFS client as inode metadata, and is not bounded to a few bytes since the attacker can probe blocks across the device.\nI:N - isofs is mounted strictly read-only and the commit confirms no memory-safety violation, so the attacker cannot modify any data or kernel memory.\nA:N - Out-of-range reads return NULL cleanly via the EIO path and in-range parsing is bounded; the commit and maintainer explicitly confirm no crash, hang, or memory-safety fault."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:29:53.831Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ee0024f5a7e3c73aa253869fae9650ae054093ca"
        },
        {
          "url": "https://git.kernel.org/stable/c/31dbb4ba0f719ae7774e4c0c95172c9bf81692f5"
        },
        {
          "url": "https://git.kernel.org/stable/c/908a76f0b1038035e6ebb4f2293ce079f92e0a02"
        },
        {
          "url": "https://git.kernel.org/stable/c/bb0988ed4f2e26d59bbb58f644cb3a55b7521e21"
        },
        {
          "url": "https://git.kernel.org/stable/c/0a1af74ae2177bda3aee0837a0546309aa539d0d"
        },
        {
          "url": "https://git.kernel.org/stable/c/afbafeddf23db13fe2edb2d5c0bf4bbb13d7881b"
        },
        {
          "url": "https://git.kernel.org/stable/c/4c721a1d9b3c4fcaf59cc9b2281e3ec5a043e1a6"
        },
        {
          "url": "https://git.kernel.org/stable/c/24376458138387fb251e782e624c7776e9826796"
        }
      ],
      "title": "isofs: validate block number from NFS file handle in isofs_export_iget",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46124",
    "datePublished": "2026-05-28T09:35:38.887Z",
    "dateReserved": "2026-05-13T15:03:33.098Z",
    "dateUpdated": "2026-08-05T12:29:53.831Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

EUVD-2026-348014

CVE-2026-46124 (GCVE-0-2026-46124)

Tags

Sightings

Nomenclature

Related by attack behaviour