Vulnerability-Lookup

GHSA-3J44-H3H4-HXHF

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-19 18:32

Details

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

libceph: remove debugfs files before client teardown

ceph_destroy_client() tears down the monitor client before removing the per-client debugfs files. A concurrent read of the monmap debugfs file can enter monmap_show() after ceph_monc_stop() has freed monc->monmap, triggering a use-after-free.

Remove the debugfs files before stopping the OSD and monitor clients. debugfs_remove() drains active handlers and prevents new accesses, so the debugfs callbacks can no longer race the rest of client teardown.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68153"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:01Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: remove debugfs files before client teardown\n\nceph_destroy_client() tears down the monitor client before removing\nthe per-client debugfs files. A concurrent read of the monmap debugfs\nfile can enter monmap_show() after ceph_monc_stop() has freed\nmonc-\u003emonmap, triggering a use-after-free.\n\nRemove the debugfs files before stopping the OSD and monitor clients.\ndebugfs_remove() drains active handlers and prevents new accesses, so\nthe debugfs callbacks can no longer race the rest of client teardown.",
  "id": "GHSA-3j44-h3h4-hxhf",
  "modified": "2026-08-19T18:32:07Z",
  "published": "2026-08-10T15:33:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68153"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/463a264e9094384112a5c8b46f0a9ddaf8566904"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8f5a3abc54ba24dbceb14cc3a719908c4f688091"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ac78549d186090ee7125d28c3a8c376573b36194"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b9fedda2f628e030384228de0dafc574b7fb0c2f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d3dc8889d39a676bf840132bd5c5c48cb0daba23"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e4c804726c4afce3ba648b982d564f6af2cfa328"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fc1010e7e0204ece6cc0f9af4f473e9553535eab"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe46b7e06f14f6f94766832df309b249cb689d27"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-68153 (GCVE-0-2026-68153)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:59 – Updated: 2026-08-19 16:30

Title

libceph: remove debugfs files before client teardown

Summary

In the Linux kernel, the following vulnerability has been resolved: libceph: remove debugfs files before client teardown ceph_destroy_client() tears down the monitor client before removing the per-client debugfs files. A concurrent read of the monmap debugfs file can enter monmap_show() after ceph_monc_stop() has freed monc->monmap, triggering a use-after-free. Remove the debugfs files before stopping the OSD and monitor clients. debugfs_remove() drains active handlers and prevents new accesses, so the debugfs callbacks can no longer race the rest of client teardown.

Severity

7.8 (High)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/ac78549d186090ee7…
https://git.kernel.org/stable/c/463a264e909438411…
https://git.kernel.org/stable/c/fe46b7e06f14f6f94…
https://git.kernel.org/stable/c/fc1010e7e0204ece6…
https://git.kernel.org/stable/c/d3dc8889d39a676bf…
https://git.kernel.org/stable/c/8f5a3abc54ba24dbc…
https://git.kernel.org/stable/c/b9fedda2f628e0303…
https://git.kernel.org/stable/c/e4c804726c4afce3b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < ac78549d186090ee7125d28c3a8c376573b36194 (git) Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < 463a264e9094384112a5c8b46f0a9ddaf8566904 (git) Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < fe46b7e06f14f6f94766832df309b249cb689d27 (git) Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < fc1010e7e0204ece6cc0f9af4f473e9553535eab (git) Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < d3dc8889d39a676bf840132bd5c5c48cb0daba23 (git) Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < 8f5a3abc54ba24dbceb14cc3a719908c4f688091 (git) Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < b9fedda2f628e030384228de0dafc574b7fb0c2f (git) Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < e4c804726c4afce3ba648b982d564f6af2cfa328 (git)
Linux	Linux	Affected: 2.6.34 Unaffected: 0 , < 2.6.34 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.148 , ≤ 6.6.* (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ceph/ceph_common.c"
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          "vendor": "Linux",
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
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            {
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            },
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            },
            {
              "lessThan": "2.6.34",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
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          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: remove debugfs files before client teardown\n\nceph_destroy_client() tears down the monitor client before removing\nthe per-client debugfs files. A concurrent read of the monmap debugfs\nfile can enter monmap_show() after ceph_monc_stop() has freed\nmonc-\u003emonmap, triggering a use-after-free.\n\nRemove the debugfs files before stopping the OSD and monitor clients.\ndebugfs_remove() drains active handlers and prevents new accesses, so\nthe debugfs callbacks can no longer race the rest of client teardown."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "value": "AV:L - Exploitation requires local access to debugfs via read() on /sys/kernel/debug/ceph/client*/monmap concurrent with local ceph client teardown via umount or rbd unmap; the bug is not reachable through Ceph network protocol handlers.\nAC:L - The attacker controls both sides of the race by concurrently reading the monmap debugfs file while triggering ceph_destroy_client() via umount/rbd teardown, and can retry until the window between ceph_monc_stop() and debugfs removal is hit.\nPR:L - An unprivileged local user can use user-namespace capabilities (CAP_DAC_READ_SEARCH) to read root-owned debugfs files and race reads against libceph client teardown during automated volume detach or service restarts on Ceph storage nodes.\nUI:N - No victim user interaction is required; a local attacker can independently issue debugfs reads and trigger or time against client teardown without requiring another user to click, open files, or mount filesystems.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security domain and does not cross VM, container, or IOMMU boundaries; impact is standard kernel privilege escalation or crash.\nC:H - The use-after-free on monc-\u003emonmap permits reading freed heap memory containing monitor addresses and entity metadata, and UAF primitives are routinely leveraged for arbitrary kernel memory disclosure.\nI:H - Heap use-after-free on the variable-length ceph_monmap structure enables memory corruption that can be groomed into arbitrary kernel write primitives and local privilege escalation via control-flow hijacking.\nA:H - Concurrent access to freed monmap memory during debugfs iteration can cause kernel oops, BUG, or panic, and UAF corruption reliably threatens system availability even when full exploitation is not attempted."
            }
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        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:30:18.048Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "libceph: remove debugfs files before client teardown",
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    "datePublished": "2026-08-10T11:59:19.302Z",
    "dateReserved": "2026-07-30T09:28:09.371Z",
    "dateUpdated": "2026-08-19T16:30:18.048Z",
    "state": "PUBLISHED"
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}

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.

Detection rules are retrieved from Rulezet.

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.

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