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

Vulnerability from cvelistv5 – Published: 2025-10-28 11:48 – Updated: 2025-12-01 06:16
VLAI?
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
References
Impacted products
Vendor Product Version
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)
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)
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": "2025-12-01T06:16:55.232Z",
        "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": "2025-12-01T06:16:55.232Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40049\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-28T12:15:39.043\",\"lastModified\":\"2025-10-30T15:05:32.197\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.



Detection rules are retrieved from Rulezet.