CVE-2026-98992 (GCVE-0-2026-98992)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:20 – Updated: 2026-10-30 12:40
VLAI
Title
namespace: don't copy an unmounted mount tree
Summary
In the Linux kernel, the following vulnerability has been resolved: namespace: don't copy an unmounted mount tree may_copy_tree() accepts a mount whose root is an nsfs or pidfs file before it checks whether that mount is mounted. This exception exists for nsfs and pidfs mounts. They are part of no mount namespace so neither check_mnt() nor is_mounted() would let them through and bind-mounting a nsfsfd or a pidfd wouldn't work. Problem is that exception also admits a bind mount of such a file when it was lazily unmounted and is only kept alive by a file descriptor: mount --bind /proc/self/ns/net /tmp/x exec 3< /tmp/x umount -l /tmp/x mount --rbind /proc/self/fd/3 /tmp/y With MS_REC or AT_RECURSIVE copy_tree() doesn't stop at the unmounted mount. It copies every mount that stayed attached to it as well. So if you have a bunch of overmounts over the nsfsfd or the pidfd the whole unmounted stack is copied. That's a bug. So refuse to walk an unmounted tree. Copying its root alone stays possible. So a bind mount of a namespace that is gone can still be recreated from a file descriptor on the old one. The file descriptor pins that mount and its root and __has_locked_children() only reads the direct children which don't leave the parent's list without namespace_sem. The internal mounts carry MNT_NS_INTERNAL instead of NULL and are still walked. Copying an unmounted tree recursively fails with EINVAL.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6773 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e149ed2b805fefdccf7ccdfc19eca22fdd4514ac , < 94d05b62dc7aea236db20166e79ee002e466393a (git)
Affected: e149ed2b805fefdccf7ccdfc19eca22fdd4514ac , < 07c6a8f004bcc58b4ccf993e6efa7b9b8b4a1b8b (git)
Affected: e149ed2b805fefdccf7ccdfc19eca22fdd4514ac , < 31cf157298271392ab5fb0805b28d37c8d7a8057 (git)
Affected: e149ed2b805fefdccf7ccdfc19eca22fdd4514ac , < 86a2d56b1960720bf1844441c0890621e9db2f25 (git)
Affected: e149ed2b805fefdccf7ccdfc19eca22fdd4514ac , < 7e037b1fd339d865737c8accd29abcf40130a5a0 (git)
Affected: e149ed2b805fefdccf7ccdfc19eca22fdd4514ac , < b47b40c4f058418f9707454543179df240796aad (git)
Affected: e149ed2b805fefdccf7ccdfc19eca22fdd4514ac , < 8d3527457e183cedee3003c2897314da49488311 (git)
Affected: e149ed2b805fefdccf7ccdfc19eca22fdd4514ac , < 8bacbf6be959973b28b691713a872c12eae69eec (git)
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Linux Linux Affected: 3.19
Unaffected: 0 , < 3.19 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (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)
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{
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnamespace: don\u0027t copy an unmounted mount tree\n\nmay_copy_tree() accepts a mount whose root is an nsfs or pidfs file\nbefore it checks whether that mount is mounted. This exception exists\nfor nsfs and pidfs mounts. They are part of no mount namespace so\nneither check_mnt() nor is_mounted() would let them through and\nbind-mounting a nsfsfd or a pidfd wouldn\u0027t work.\n\nProblem is that exception also admits a bind mount of such a file when\nit was lazily unmounted and is only kept alive by a file descriptor:\n\n  mount --bind /proc/self/ns/net /tmp/x\n  exec 3\u003c /tmp/x\n  umount -l /tmp/x\n  mount --rbind /proc/self/fd/3 /tmp/y\n\nWith MS_REC or AT_RECURSIVE copy_tree() doesn\u0027t stop at the unmounted\nmount. It copies every mount that stayed attached to it as well. So if\nyou have a bunch of overmounts over the nsfsfd or the pidfd the whole\nunmounted stack is copied. That\u0027s a bug.\n\nSo refuse to walk an unmounted tree. Copying its root alone stays\npossible. So a bind mount of a namespace that is gone can still be\nrecreated from a file descriptor on the old one. The file descriptor\npins that mount and its root and __has_locked_children() only reads the\ndirect children which don\u0027t leave the parent\u0027s list without\nnamespace_sem. The internal mounts carry MNT_NS_INTERNAL instead of NULL\nand are still walked. Copying an unmounted tree recursively fails with\nEINVAL."
          }
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        "metrics": {},
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: namespace: don\u0027t copy an unmounted mount tree",
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      "cve": "CVE-2026-98992",
      "id": "CVE-2026-98992",
      "initial_release_date": "2026-10-23T23:52:11Z",
      "product_status:known_affected": "158",
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      "source": "SUSE CSAF VEX",
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      "title": "SUSE CVE CVE-2026-98992",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98992.json",
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  }
}



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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
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    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.