CVE-2025-40049 (GCVE-0-2025-40049)

Vulnerability from cvelistv5 – Published: 2025-10-28 11:48 – Updated: 2026-05-11 21:41
VLAI
Title
Squashfs: fix uninit-value in squashfs_get_parent
Summary
In the Linux kernel, the following vulnerability has been resolved: Squashfs: fix uninit-value in squashfs_get_parent Syzkaller reports a "KMSAN: uninit-value in squashfs_get_parent" bug. This is caused by open_by_handle_at() being called with a file handle containing an invalid parent inode number. In particular the inode number is that of a symbolic link, rather than a directory. Squashfs_get_parent() gets called with that symbolic link inode, and accesses the parent member field. unsigned int parent_ino = squashfs_i(inode)->parent; Because non-directory inodes in Squashfs do not have a parent value, this is uninitialised, and this causes an uninitialised value access. The fix is to initialise parent with the invalid inode 0, which will cause an EINVAL error to be returned. Regular inodes used to share the parent field with the block_list_start field. This is removed in this commit to enable the parent field to contain the invalid inode number 0.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7063 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 122601408d20c77704268f1dea9f9ce4abf997c2 , < f81a5bc9e924ee1950e0dd82bd10749048390f6e (git)
Affected: 122601408d20c77704268f1dea9f9ce4abf997c2 , < 382a47fae449e554ef1e8c198667fd2f3270b945 (git)
Affected: 122601408d20c77704268f1dea9f9ce4abf997c2 , < 61d38b5ce2782bff3cacaacbb8164087a73ed1a5 (git)
Affected: 122601408d20c77704268f1dea9f9ce4abf997c2 , < 81a2bca52d43fc9d9abf07408b91255131c5dc53 (git)
Affected: 122601408d20c77704268f1dea9f9ce4abf997c2 , < c28b0ca029edf5d0558abcd76cb8c732706cd339 (git)
Affected: 122601408d20c77704268f1dea9f9ce4abf997c2 , < 1b3ccd0019132880c94bb00ca7088c1749308f82 (git)
Affected: 122601408d20c77704268f1dea9f9ce4abf997c2 , < 91b99db7a92e57ff48a96a1b10fddfd2547e7f53 (git)
Affected: 122601408d20c77704268f1dea9f9ce4abf997c2 , < 74058c0a9fc8b2b4d5f4a0ef7ee2cfa66a9e49cf (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
Unaffected: 5.4.301 , ≤ 5.4.* (semver)
Unaffected: 5.10.246 , ≤ 5.10.* (semver)
Unaffected: 5.15.195 , ≤ 5.15.* (semver)
Unaffected: 6.1.156 , ≤ 6.1.* (semver)
Unaffected: 6.6.112 , ≤ 6.6.* (semver)
Unaffected: 6.12.53 , ≤ 6.12.* (semver)
Unaffected: 6.17.3 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/squashfs/inode.c",
            "fs/squashfs/squashfs_fs_i.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f81a5bc9e924ee1950e0dd82bd10749048390f6e",
              "status": "affected",
              "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
              "versionType": "git"
            },
            {
              "lessThan": "382a47fae449e554ef1e8c198667fd2f3270b945",
              "status": "affected",
              "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
              "versionType": "git"
            },
            {
              "lessThan": "61d38b5ce2782bff3cacaacbb8164087a73ed1a5",
              "status": "affected",
              "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
              "versionType": "git"
            },
            {
              "lessThan": "81a2bca52d43fc9d9abf07408b91255131c5dc53",
              "status": "affected",
              "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
              "versionType": "git"
            },
            {
              "lessThan": "c28b0ca029edf5d0558abcd76cb8c732706cd339",
              "status": "affected",
              "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
              "versionType": "git"
            },
            {
              "lessThan": "1b3ccd0019132880c94bb00ca7088c1749308f82",
              "status": "affected",
              "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
              "versionType": "git"
            },
            {
              "lessThan": "91b99db7a92e57ff48a96a1b10fddfd2547e7f53",
              "status": "affected",
              "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
              "versionType": "git"
            },
            {
              "lessThan": "74058c0a9fc8b2b4d5f4a0ef7ee2cfa66a9e49cf",
              "status": "affected",
              "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/squashfs/inode.c",
            "fs/squashfs/squashfs_fs_i.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.29"
            },
            {
              "lessThan": "2.6.29",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.301",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.246",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.195",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.156",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.301",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.246",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.195",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.156",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.112",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.53",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.3",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSquashfs: fix uninit-value in squashfs_get_parent\n\nSyzkaller reports a \"KMSAN: uninit-value in squashfs_get_parent\" bug.\n\nThis is caused by open_by_handle_at() being called with a file handle\ncontaining an invalid parent inode number.  In particular the inode number\nis that of a symbolic link, rather than a directory.\n\nSquashfs_get_parent() gets called with that symbolic link inode, and\naccesses the parent member field.\n\n\tunsigned int parent_ino = squashfs_i(inode)-\u003eparent;\n\nBecause non-directory inodes in Squashfs do not have a parent value, this\nis uninitialised, and this causes an uninitialised value access.\n\nThe fix is to initialise parent with the invalid inode 0, which will cause\nan EINVAL error to be returned.\n\nRegular inodes used to share the parent field with the block_list_start\nfield.  This is removed in this commit to enable the parent field to\ncontain the invalid inode number 0."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:41:29.576Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f81a5bc9e924ee1950e0dd82bd10749048390f6e"
        },
        {
          "url": "https://git.kernel.org/stable/c/382a47fae449e554ef1e8c198667fd2f3270b945"
        },
        {
          "url": "https://git.kernel.org/stable/c/61d38b5ce2782bff3cacaacbb8164087a73ed1a5"
        },
        {
          "url": "https://git.kernel.org/stable/c/81a2bca52d43fc9d9abf07408b91255131c5dc53"
        },
        {
          "url": "https://git.kernel.org/stable/c/c28b0ca029edf5d0558abcd76cb8c732706cd339"
        },
        {
          "url": "https://git.kernel.org/stable/c/1b3ccd0019132880c94bb00ca7088c1749308f82"
        },
        {
          "url": "https://git.kernel.org/stable/c/91b99db7a92e57ff48a96a1b10fddfd2547e7f53"
        },
        {
          "url": "https://git.kernel.org/stable/c/74058c0a9fc8b2b4d5f4a0ef7ee2cfa66a9e49cf"
        }
      ],
      "title": "Squashfs: fix uninit-value in squashfs_get_parent",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40049",
    "datePublished": "2025-10-28T11:48:25.862Z",
    "dateReserved": "2025-04-16T07:20:57.157Z",
    "dateUpdated": "2026-05-11T21:41:29.576Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-40049",
      "date": "2026-10-26",
      "epss": "0.00227",
      "percentile": "0.13296"
    },
    "microsoft_vex": {
      "current_release_date": "2025-10-29T01:04:20.000Z",
      "cve": "CVE-2025-40049",
      "id": "msrc_CVE-2025-40049",
      "initial_release_date": "2025-10-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Squashfs: fix uninit-value in squashfs_get_parent",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-40049.json",
      "version": "1"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "fs/squashfs/inode.c",
                  "fs/squashfs/squashfs_fs_i.h"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "f81a5bc9e924ee1950e0dd82bd10749048390f6e",
                    "status": "affected",
                    "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "382a47fae449e554ef1e8c198667fd2f3270b945",
                    "status": "affected",
                    "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "61d38b5ce2782bff3cacaacbb8164087a73ed1a5",
                    "status": "affected",
                    "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "81a2bca52d43fc9d9abf07408b91255131c5dc53",
                    "status": "affected",
                    "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "c28b0ca029edf5d0558abcd76cb8c732706cd339",
                    "status": "affected",
                    "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "1b3ccd0019132880c94bb00ca7088c1749308f82",
                    "status": "affected",
                    "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "91b99db7a92e57ff48a96a1b10fddfd2547e7f53",
                    "status": "affected",
                    "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "74058c0a9fc8b2b4d5f4a0ef7ee2cfa66a9e49cf",
                    "status": "affected",
                    "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "fs/squashfs/inode.c",
                  "fs/squashfs/squashfs_fs_i.h"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "2.6.29"
                  },
                  {
                    "lessThan": "2.6.29",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.4.*",
                    "status": "unaffected",
                    "version": "5.4.301",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.10.*",
                    "status": "unaffected",
                    "version": "5.10.246",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.195",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.156",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.112",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.53",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.17.*",
                    "status": "unaffected",
                    "version": "6.17.3",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.18",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSquashfs: fix uninit-value in squashfs_get_parent\n\nSyzkaller reports a \"KMSAN: uninit-value in squashfs_get_parent\" bug.\n\nThis is caused by open_by_handle_at() being called with a file handle\ncontaining an invalid parent inode number.  In particular the inode number\nis that of a symbolic link, rather than a directory.\n\nSquashfs_get_parent() gets called with that symbolic link inode, and\naccesses the parent member field.\n\n\tunsigned int parent_ino = squashfs_i(inode)-\u003eparent;\n\nBecause non-directory inodes in Squashfs do not have a parent value, this\nis uninitialised, and this causes an uninitialised value access.\n\nThe fix is to initialise parent with the invalid inode 0, which will cause\nan EINVAL error to be returned.\n\nRegular inodes used to share the parent field with the block_list_start\nfield.  This is removed in this commit to enable the parent field to\ncontain the invalid inode number 0."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nSquashfs: correcci\u00f3n de valor no inicializado en squashfs_get_parent\n\nSyzkaller informa de un error KMSAN: uninit-value in squashfs_get_parent.\n\nEsto es causado por la llamada a open_by_handle_at() con un descriptor de archivo que contiene un n\u00famero de inodo padre no v\u00e1lido. En particular, el n\u00famero de inodo es el de un enlace simb\u00f3lico, en lugar de un directorio.\n\nSe llama a Squashfs_get_parent() con ese inodo de enlace simb\u00f3lico y accede al campo miembro parent.\n\n\tunsigned int parent_ino = squashfs_i(inode)-\u003eparent;\n\nDebido a que los inodos que no son directorios en Squashfs no tienen un valor parent, esto no est\u00e1 inicializado, y esto causa un acceso a un valor no inicializado.\n\nLa soluci\u00f3n es inicializar parent con el inodo no v\u00e1lido 0, lo que har\u00e1 que se devuelva un error EINVAL.\n\nLos inodos regulares sol\u00edan compartir el campo parent con el campo block_list_start. Esto se elimina en este commit para permitir que el campo parent contenga el n\u00famero de inodo no v\u00e1lido 0."
          }
        ],
        "id": "CVE-2025-40049",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {},
        "published": "2025-10-28T12:15:39.043",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1b3ccd0019132880c94bb00ca7088c1749308f82"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/382a47fae449e554ef1e8c198667fd2f3270b945"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/61d38b5ce2782bff3cacaacbb8164087a73ed1a5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/74058c0a9fc8b2b4d5f4a0ef7ee2cfa66a9e49cf"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/81a2bca52d43fc9d9abf07408b91255131c5dc53"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/91b99db7a92e57ff48a96a1b10fddfd2547e7f53"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c28b0ca029edf5d0558abcd76cb8c732706cd339"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f81a5bc9e924ee1950e0dd82bd10749048390f6e"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:18:11+00:00",
      "cve": "CVE-2025-40049",
      "id": "CVE-2025-40049",
      "initial_release_date": "2025-10-28T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Squashfs: fix uninit-value in squashfs_get_parent",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40049.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    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.