Vulnerability-Lookup

CVE-2026-98984 (GCVE-0-2026-98984)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:20 – Updated: 2026-10-23 12:20

Title

dcache: don't put a mountpoint on a dentry that's being removed

Summary

In the Linux kernel, the following vulnerability has been resolved: dcache: don't put a mountpoint on a dentry that's being removed rmdir(), unlink() and rename() call dont_mount() on the victim and then detach_mounts() with the victim's inode locked. do_lock_mount() takes the inode lock of the mountpoint and checks cant_mount() so a mount can't show up after detach_mounts(). But attach_recursive_mnt() makes a second mountpoint for the root of the source mount so that the mounts already located at the destination can be put on top of it. No inode is locked for that one and d_set_mounted() only refuses a dentry that is unlinked. Between detach_mounts() and d_delete() the victim is still hashed: rmrace: b passed dont_mount() and detach_mounts(), sleeping T2: move_mount(S, /tmp/plcant/x, BENEATH) = 0 errno 0 () T1: rmdir(/tmp/plcant/d/b) = 0 errno 0 109 107 0:61 /d/b//deleted /tmp/plcant/x rw,relatime - tmpfs tmpfs rw 108 109 0:63 / /tmp/plcant/x rw,relatime - tmpfs T rw A bind mount of the directory that's being removed is moved beneath an existing mount while the rmdir() is located between the two calls. The mount ends up on the removed directory and nothing will ever detach it. Check cant_mount() in d_set_mounted() as well. dont_mount() raises the flag under d_lock before detach_mounts() runs so either the mountpoint is set first and detach_mounts() finds the mount or the flag is seen and the mount is refused.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7061 records in the last 180 days details

References

5 references

URL	Tags
https://git.kernel.org/stable/c/5e6bfd9f249f2c74b…
https://git.kernel.org/stable/c/793cb67b0f52d00c6…
https://git.kernel.org/stable/c/390ddcea2a8aca411…
https://git.kernel.org/stable/c/30a1625022411a387…
https://git.kernel.org/stable/c/75f4197f1e11d2eb7…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 1064f874abc0d05eeed8993815f584d847b72486 , < 5e6bfd9f249f2c74bb63c0f06ad959da3bee0971 (git) Affected: 1064f874abc0d05eeed8993815f584d847b72486 , < 793cb67b0f52d00c67bd0e76bc57455b5c70ebb8 (git) Affected: 1064f874abc0d05eeed8993815f584d847b72486 , < 390ddcea2a8aca411b931a8e2863a80ccca8d2b3 (git) Affected: 1064f874abc0d05eeed8993815f584d847b72486 , < 30a1625022411a387cce9239408ece9955bc9c58 (git) Affected: 1064f874abc0d05eeed8993815f584d847b72486 , < 75f4197f1e11d2eb75c2d6f916a7d4764db621e5 (git) Affected: 5e6ef5ef6eaf690faad3a7c6c665ebf45d7b6ccf (git) Affected: 839d42687dfce0ed0ea2c6bd8d707cc0e276fbe7 (git) Affected: 808e83e5add13152bd4a88346487de68395c136b (git) Affected: 6de9d08a9718ee9c12ba6343c50141c2d633e3dc (git) Affected: 4.1.40 , < 4.2 (semver) Affected: 4.4.54 , < 4.5 (semver) Affected: 4.9.15 , < 4.10 (semver) Affected: 4.10.3 , < 4.11 (semver)	guessed
Linux	Linux	Affected: 4.11 Unaffected: 0 , < 4.11 (semver) Unaffected: 6.6.160 , ≤ 6.6.* (semver) Unaffected: 6.12.113 , ≤ 6.12.* (semver) Unaffected: 6.18.57 , ≤ 6.18.* (semver) Unaffected: 7.2.11 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/dcache.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "1064f874abc0d05eeed8993815f584d847b72486",
              "versionType": "git"
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            },
            {
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              "status": "affected",
              "version": "1064f874abc0d05eeed8993815f584d847b72486",
              "versionType": "git"
            },
            {
              "lessThan": "30a1625022411a387cce9239408ece9955bc9c58",
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              "versionType": "git"
            },
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5e6ef5ef6eaf690faad3a7c6c665ebf45d7b6ccf",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "839d42687dfce0ed0ea2c6bd8d707cc0e276fbe7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "808e83e5add13152bd4a88346487de68395c136b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6de9d08a9718ee9c12ba6343c50141c2d633e3dc",
              "versionType": "git"
            },
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              "lessThan": "4.2",
              "status": "affected",
              "version": "4.1.40",
              "versionType": "semver"
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              "status": "affected",
              "version": "4.4.54",
              "versionType": "semver"
            },
            {
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              "status": "affected",
              "version": "4.9.15",
              "versionType": "semver"
            },
            {
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              "status": "affected",
              "version": "4.10.3",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/dcache.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.11"
            },
            {
              "lessThan": "4.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.113",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.57",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.11",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.1.40",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.4.54",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.9.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.10.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndcache: don\u0027t put a mountpoint on a dentry that\u0027s being removed\n\nrmdir(), unlink() and rename() call dont_mount() on the victim and then\ndetach_mounts() with the victim\u0027s inode locked. do_lock_mount() takes\nthe inode lock of the mountpoint and checks cant_mount() so a mount\ncan\u0027t show up after detach_mounts().\n\nBut attach_recursive_mnt() makes a second mountpoint for the root of the\nsource mount so that the mounts already located at the destination can\nbe put on top of it. No inode is locked for that one and d_set_mounted()\nonly refuses a dentry that is unlinked. Between detach_mounts() and\nd_delete() the victim is still hashed:\n\n  rmrace: b passed dont_mount() and detach_mounts(), sleeping\n  T2: move_mount(S, /tmp/plcant/x, BENEATH) = 0 errno 0 ()\n  T1: rmdir(/tmp/plcant/d/b) = 0 errno 0\n      109 107 0:61 /d/b//deleted /tmp/plcant/x rw,relatime - tmpfs tmpfs rw\n      108 109 0:63 / /tmp/plcant/x rw,relatime - tmpfs T rw\n\nA bind mount of the directory that\u0027s being removed is moved beneath an\nexisting mount while the rmdir() is located between the two calls. The\nmount ends up on the removed directory and nothing will ever detach it.\n\nCheck cant_mount() in d_set_mounted() as well. dont_mount() raises the\nflag under d_lock before detach_mounts() runs so either the mountpoint\nis set first and detach_mounts() finds the mount or the flag is seen and\nthe mount is refused."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T12:20:02.285Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5e6bfd9f249f2c74bb63c0f06ad959da3bee0971"
        },
        {
          "url": "https://git.kernel.org/stable/c/793cb67b0f52d00c67bd0e76bc57455b5c70ebb8"
        },
        {
          "url": "https://git.kernel.org/stable/c/390ddcea2a8aca411b931a8e2863a80ccca8d2b3"
        },
        {
          "url": "https://git.kernel.org/stable/c/30a1625022411a387cce9239408ece9955bc9c58"
        },
        {
          "url": "https://git.kernel.org/stable/c/75f4197f1e11d2eb75c2d6f916a7d4764db621e5"
        }
      ],
      "title": "dcache: don\u0027t put a mountpoint on a dentry that\u0027s being removed",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98984",
    "datePublished": "2026-10-23T12:20:02.285Z",
    "dateReserved": "2026-09-25T10:25:14.384Z",
    "dateUpdated": "2026-10-23T12:20:02.285Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "fs/dcache.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "5e6bfd9f249f2c74bb63c0f06ad959da3bee0971",
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                    "version": "1064f874abc0d05eeed8993815f584d847b72486",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "793cb67b0f52d00c67bd0e76bc57455b5c70ebb8",
                    "status": "affected",
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                    "versionType": "git"
                  },
                  {
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                    "versionType": "git"
                  },
                  {
                    "lessThan": "30a1625022411a387cce9239408ece9955bc9c58",
                    "status": "affected",
                    "version": "1064f874abc0d05eeed8993815f584d847b72486",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "75f4197f1e11d2eb75c2d6f916a7d4764db621e5",
                    "status": "affected",
                    "version": "1064f874abc0d05eeed8993815f584d847b72486",
                    "versionType": "git"
                  },
                  {
                    "status": "affected",
                    "version": "5e6ef5ef6eaf690faad3a7c6c665ebf45d7b6ccf",
                    "versionType": "git"
                  },
                  {
                    "status": "affected",
                    "version": "839d42687dfce0ed0ea2c6bd8d707cc0e276fbe7",
                    "versionType": "git"
                  },
                  {
                    "status": "affected",
                    "version": "808e83e5add13152bd4a88346487de68395c136b",
                    "versionType": "git"
                  },
                  {
                    "status": "affected",
                    "version": "6de9d08a9718ee9c12ba6343c50141c2d633e3dc",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "4.2",
                    "status": "affected",
                    "version": "4.1.40",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "4.5",
                    "status": "affected",
                    "version": "4.4.54",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "4.10",
                    "status": "affected",
                    "version": "4.9.15",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "4.11",
                    "status": "affected",
                    "version": "4.10.3",
                    "versionType": "semver"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "fs/dcache.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "4.11"
                  },
                  {
                    "lessThan": "4.11",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.160",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.113",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.57",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.11",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
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                    "version": "7.3",
                    "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\ndcache: don\u0027t put a mountpoint on a dentry that\u0027s being removed\n\nrmdir(), unlink() and rename() call dont_mount() on the victim and then\ndetach_mounts() with the victim\u0027s inode locked. do_lock_mount() takes\nthe inode lock of the mountpoint and checks cant_mount() so a mount\ncan\u0027t show up after detach_mounts().\n\nBut attach_recursive_mnt() makes a second mountpoint for the root of the\nsource mount so that the mounts already located at the destination can\nbe put on top of it. No inode is locked for that one and d_set_mounted()\nonly refuses a dentry that is unlinked. Between detach_mounts() and\nd_delete() the victim is still hashed:\n\n  rmrace: b passed dont_mount() and detach_mounts(), sleeping\n  T2: move_mount(S, /tmp/plcant/x, BENEATH) = 0 errno 0 ()\n  T1: rmdir(/tmp/plcant/d/b) = 0 errno 0\n      109 107 0:61 /d/b//deleted /tmp/plcant/x rw,relatime - tmpfs tmpfs rw\n      108 109 0:63 / /tmp/plcant/x rw,relatime - tmpfs T rw\n\nA bind mount of the directory that\u0027s being removed is moved beneath an\nexisting mount while the rmdir() is located between the two calls. The\nmount ends up on the removed directory and nothing will ever detach it.\n\nCheck cant_mount() in d_set_mounted() as well. dont_mount() raises the\nflag under d_lock before detach_mounts() runs so either the mountpoint\nis set first and detach_mounts() finds the mount or the flag is seen and\nthe mount is refused."
          }
        ],
        "id": "CVE-2026-98984",
        "lastModified": "2026-10-23T13:17:20.287",
        "metrics": {},
        "published": "2026-10-23T13:17:20.287",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/30a1625022411a387cce9239408ece9955bc9c58"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/390ddcea2a8aca411b931a8e2863a80ccca8d2b3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5e6bfd9f249f2c74bb63c0f06ad959da3bee0971"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/75f4197f1e11d2eb75c2d6f916a7d4764db621e5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/793cb67b0f52d00c67bd0e76bc57455b5c70ebb8"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}

FKIE_CVE-2026-98984

Vulnerability from fkie_nvd - Published: 2026-10-23 13:17 - Updated: 2026-10-23 13:17

Severity

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/30a1625022411a387cce9239408ece9955bc9c58
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/390ddcea2a8aca411b931a8e2863a80ccca8d2b3
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5e6bfd9f249f2c74bb63c0f06ad959da3bee0971
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/75f4197f1e11d2eb75c2d6f916a7d4764db621e5
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/793cb67b0f52d00c67bd0e76bc57455b5c70ebb8

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/dcache.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5e6bfd9f249f2c74bb63c0f06ad959da3bee0971",
              "status": "affected",
              "version": "1064f874abc0d05eeed8993815f584d847b72486",
              "versionType": "git"
            },
            {
              "lessThan": "793cb67b0f52d00c67bd0e76bc57455b5c70ebb8",
              "status": "affected",
              "version": "1064f874abc0d05eeed8993815f584d847b72486",
              "versionType": "git"
            },
            {
              "lessThan": "390ddcea2a8aca411b931a8e2863a80ccca8d2b3",
              "status": "affected",
              "version": "1064f874abc0d05eeed8993815f584d847b72486",
              "versionType": "git"
            },
            {
              "lessThan": "30a1625022411a387cce9239408ece9955bc9c58",
              "status": "affected",
              "version": "1064f874abc0d05eeed8993815f584d847b72486",
              "versionType": "git"
            },
            {
              "lessThan": "75f4197f1e11d2eb75c2d6f916a7d4764db621e5",
              "status": "affected",
              "version": "1064f874abc0d05eeed8993815f584d847b72486",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5e6ef5ef6eaf690faad3a7c6c665ebf45d7b6ccf",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "839d42687dfce0ed0ea2c6bd8d707cc0e276fbe7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "808e83e5add13152bd4a88346487de68395c136b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6de9d08a9718ee9c12ba6343c50141c2d633e3dc",
              "versionType": "git"
            },
            {
              "lessThan": "4.2",
              "status": "affected",
              "version": "4.1.40",
              "versionType": "semver"
            },
            {
              "lessThan": "4.5",
              "status": "affected",
              "version": "4.4.54",
              "versionType": "semver"
            },
            {
              "lessThan": "4.10",
              "status": "affected",
              "version": "4.9.15",
              "versionType": "semver"
            },
            {
              "lessThan": "4.11",
              "status": "affected",
              "version": "4.10.3",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/dcache.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.11"
            },
            {
              "lessThan": "4.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "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\ndcache: don\u0027t put a mountpoint on a dentry that\u0027s being removed\n\nrmdir(), unlink() and rename() call dont_mount() on the victim and then\ndetach_mounts() with the victim\u0027s inode locked. do_lock_mount() takes\nthe inode lock of the mountpoint and checks cant_mount() so a mount\ncan\u0027t show up after detach_mounts().\n\nBut attach_recursive_mnt() makes a second mountpoint for the root of the\nsource mount so that the mounts already located at the destination can\nbe put on top of it. No inode is locked for that one and d_set_mounted()\nonly refuses a dentry that is unlinked. Between detach_mounts() and\nd_delete() the victim is still hashed:\n\n  rmrace: b passed dont_mount() and detach_mounts(), sleeping\n  T2: move_mount(S, /tmp/plcant/x, BENEATH) = 0 errno 0 ()\n  T1: rmdir(/tmp/plcant/d/b) = 0 errno 0\n      109 107 0:61 /d/b//deleted /tmp/plcant/x rw,relatime - tmpfs tmpfs rw\n      108 109 0:63 / /tmp/plcant/x rw,relatime - tmpfs T rw\n\nA bind mount of the directory that\u0027s being removed is moved beneath an\nexisting mount while the rmdir() is located between the two calls. The\nmount ends up on the removed directory and nothing will ever detach it.\n\nCheck cant_mount() in d_set_mounted() as well. dont_mount() raises the\nflag under d_lock before detach_mounts() runs so either the mountpoint\nis set first and detach_mounts() finds the mount or the flag is seen and\nthe mount is refused."
    }
  ],
  "id": "CVE-2026-98984",
  "lastModified": "2026-10-23T13:17:20.287",
  "metrics": {},
  "published": "2026-10-23T13:17:20.287",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/30a1625022411a387cce9239408ece9955bc9c58"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/390ddcea2a8aca411b931a8e2863a80ccca8d2b3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5e6bfd9f249f2c74bb63c0f06ad959da3bee0971"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/75f4197f1e11d2eb75c2d6f916a7d4764db621e5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/793cb67b0f52d00c67bd0e76bc57455b5c70ebb8"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-J5F8-8HQX-2HCR

Vulnerability from github – Published: 2026-10-23 15:31 – Updated: 2026-10-23 15:31

Details

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

dcache: don't put a mountpoint on a dentry that's being removed

rmdir(), unlink() and rename() call dont_mount() on the victim and then detach_mounts() with the victim's inode locked. do_lock_mount() takes the inode lock of the mountpoint and checks cant_mount() so a mount can't show up after detach_mounts().

But attach_recursive_mnt() makes a second mountpoint for the root of the source mount so that the mounts already located at the destination can be put on top of it. No inode is locked for that one and d_set_mounted() only refuses a dentry that is unlinked. Between detach_mounts() and d_delete() the victim is still hashed:

rmrace: b passed dont_mount() and detach_mounts(), sleeping T2: move_mount(S, /tmp/plcant/x, BENEATH) = 0 errno 0 () T1: rmdir(/tmp/plcant/d/b) = 0 errno 0 109 107 0:61 /d/b//deleted /tmp/plcant/x rw,relatime - tmpfs tmpfs rw 108 109 0:63 / /tmp/plcant/x rw,relatime - tmpfs T rw

A bind mount of the directory that's being removed is moved beneath an existing mount while the rmdir() is located between the two calls. The mount ends up on the removed directory and nothing will ever detach it.

Check cant_mount() in d_set_mounted() as well. dont_mount() raises the flag under d_lock before detach_mounts() runs so either the mountpoint is set first and detach_mounts() finds the mount or the flag is seen and the mount is refused.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-98984"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-23T13:17:20Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndcache: don\u0027t put a mountpoint on a dentry that\u0027s being removed\n\nrmdir(), unlink() and rename() call dont_mount() on the victim and then\ndetach_mounts() with the victim\u0027s inode locked. do_lock_mount() takes\nthe inode lock of the mountpoint and checks cant_mount() so a mount\ncan\u0027t show up after detach_mounts().\n\nBut attach_recursive_mnt() makes a second mountpoint for the root of the\nsource mount so that the mounts already located at the destination can\nbe put on top of it. No inode is locked for that one and d_set_mounted()\nonly refuses a dentry that is unlinked. Between detach_mounts() and\nd_delete() the victim is still hashed:\n\n  rmrace: b passed dont_mount() and detach_mounts(), sleeping\n  T2: move_mount(S, /tmp/plcant/x, BENEATH) = 0 errno 0 ()\n  T1: rmdir(/tmp/plcant/d/b) = 0 errno 0\n      109 107 0:61 /d/b//deleted /tmp/plcant/x rw,relatime - tmpfs tmpfs rw\n      108 109 0:63 / /tmp/plcant/x rw,relatime - tmpfs T rw\n\nA bind mount of the directory that\u0027s being removed is moved beneath an\nexisting mount while the rmdir() is located between the two calls. The\nmount ends up on the removed directory and nothing will ever detach it.\n\nCheck cant_mount() in d_set_mounted() as well. dont_mount() raises the\nflag under d_lock before detach_mounts() runs so either the mountpoint\nis set first and detach_mounts() finds the mount or the flag is seen and\nthe mount is refused.",
  "id": "GHSA-j5f8-8hqx-2hcr",
  "modified": "2026-10-23T15:31:33Z",
  "published": "2026-10-23T15:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98984"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/30a1625022411a387cce9239408ece9955bc9c58"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/390ddcea2a8aca411b931a8e2863a80ccca8d2b3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5e6bfd9f249f2c74bb63c0f06ad959da3bee0971"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/75f4197f1e11d2eb75c2d6f916a7d4764db621e5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/793cb67b0f52d00c67bd0e76bc57455b5c70ebb8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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CVE-2026-98984 (GCVE-0-2026-98984)

FKIE_CVE-2026-98984

GHSA-J5F8-8HQX-2HCR

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