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GHSA-W6PJ-FV9F-22WF

Vulnerability from github – Published: 2026-08-12 00:31 – Updated: 2026-08-19 18:32

Details

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

libceph: bound get_version reply decode to front len

handle_get_version_reply() uses msg->front_alloc_len as the decode boundary for MON_GET_VERSION_REPLY. That is the size of the reused reply buffer, not the number of bytes actually received.

A truncated reply can therefore pass ceph_decode_need() and decode the second u64 from stale tail bytes left in the buffer by an earlier message, causing an uninitialized memory read.

Use msg->front.iov_len as the receive-side decode boundary, matching other libceph reply handlers and limiting decoding to the bytes that were actually read from the wire.

Severity

8.6 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68433"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-12T00:17:43Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: bound get_version reply decode to front len\n\nhandle_get_version_reply() uses msg-\u003efront_alloc_len as the decode\nboundary for MON_GET_VERSION_REPLY.  That is the size of the reused\nreply buffer, not the number of bytes actually received.\n\nA truncated reply can therefore pass ceph_decode_need() and decode the\nsecond u64 from stale tail bytes left in the buffer by an earlier\nmessage, causing an uninitialized memory read.\n\nUse msg-\u003efront.iov_len as the receive-side decode boundary, matching\nother libceph reply handlers and limiting decoding to the bytes that\nwere actually read from the wire.",
  "id": "GHSA-w6pj-fv9f-22wf",
  "modified": "2026-08-19T18:32:20Z",
  "published": "2026-08-12T00:31:12Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68433"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d934c934ec746d53fc7e4f53239792647bbae63"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1307028f082756bf453e1889aee9983d30643a4b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/340e0386aa39da181015bee38f309018c335ce16"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e7ebfaa0d14cf50e44041bfde38070d6dbc019f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/72a35070fcefa229b1b031aa7482ad3788e18f07"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d3c32939fa0e3ee9b883b9a0fd1972c5c444e3d0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d60de8253c85a02d0e6194b0735e7a562981a04c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f6cbf6878f3a1503c872ba8f1e69a58ee68d8b2e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-68433 (GCVE-0-2026-68433)

Vulnerability from cvelistv5 – Published: 2026-08-12 00:07 – Updated: 2026-08-19 16:35

Title

libceph: bound get_version reply decode to front len

Summary

In the Linux kernel, the following vulnerability has been resolved: libceph: bound get_version reply decode to front len handle_get_version_reply() uses msg->front_alloc_len as the decode boundary for MON_GET_VERSION_REPLY. That is the size of the reused reply buffer, not the number of bytes actually received. A truncated reply can therefore pass ceph_decode_need() and decode the second u64 from stale tail bytes left in the buffer by an earlier message, causing an uninitialized memory read. Use msg->front.iov_len as the receive-side decode boundary, matching other libceph reply handlers and limiting decoding to the bytes that were actually read from the wire.

Severity

8.6 (High)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/1307028f082756bf4…
https://git.kernel.org/stable/c/f6cbf6878f3a1503c…
https://git.kernel.org/stable/c/72a35070fcefa229b…
https://git.kernel.org/stable/c/340e0386aa39da181…
https://git.kernel.org/stable/c/d60de8253c85a02d0…
https://git.kernel.org/stable/c/4e7ebfaa0d14cf50e…
https://git.kernel.org/stable/c/0d934c934ec746d53…
https://git.kernel.org/stable/c/d3c32939fa0e3ee9b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 , < 1307028f082756bf453e1889aee9983d30643a4b (git) Affected: 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 , < f6cbf6878f3a1503c872ba8f1e69a58ee68d8b2e (git) Affected: 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 , < 72a35070fcefa229b1b031aa7482ad3788e18f07 (git) Affected: 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 , < 340e0386aa39da181015bee38f309018c335ce16 (git) Affected: 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 , < d60de8253c85a02d0e6194b0735e7a562981a04c (git) Affected: 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 , < 4e7ebfaa0d14cf50e44041bfde38070d6dbc019f (git) Affected: 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 , < 0d934c934ec746d53fc7e4f53239792647bbae63 (git) Affected: 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 , < d3c32939fa0e3ee9b883b9a0fd1972c5c444e3d0 (git)
Linux	Linux	Affected: 3.16 Unaffected: 0 , < 3.16 (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/mon_client.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1307028f082756bf453e1889aee9983d30643a4b",
              "status": "affected",
              "version": "513a8243d67f8e8d27f2883bd2f18bc87c7ca376",
              "versionType": "git"
            },
            {
              "lessThan": "f6cbf6878f3a1503c872ba8f1e69a58ee68d8b2e",
              "status": "affected",
              "version": "513a8243d67f8e8d27f2883bd2f18bc87c7ca376",
              "versionType": "git"
            },
            {
              "lessThan": "72a35070fcefa229b1b031aa7482ad3788e18f07",
              "status": "affected",
              "version": "513a8243d67f8e8d27f2883bd2f18bc87c7ca376",
              "versionType": "git"
            },
            {
              "lessThan": "340e0386aa39da181015bee38f309018c335ce16",
              "status": "affected",
              "version": "513a8243d67f8e8d27f2883bd2f18bc87c7ca376",
              "versionType": "git"
            },
            {
              "lessThan": "d60de8253c85a02d0e6194b0735e7a562981a04c",
              "status": "affected",
              "version": "513a8243d67f8e8d27f2883bd2f18bc87c7ca376",
              "versionType": "git"
            },
            {
              "lessThan": "4e7ebfaa0d14cf50e44041bfde38070d6dbc019f",
              "status": "affected",
              "version": "513a8243d67f8e8d27f2883bd2f18bc87c7ca376",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "513a8243d67f8e8d27f2883bd2f18bc87c7ca376",
              "versionType": "git"
            },
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              "versionType": "git"
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.16"
            },
            {
              "lessThan": "3.16",
              "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"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.265",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.216",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.183",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.148",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.101",
                  "versionStartIncluding": "3.16",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.6",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: bound get_version reply decode to front len\n\nhandle_get_version_reply() uses msg-\u003efront_alloc_len as the decode\nboundary for MON_GET_VERSION_REPLY.  That is the size of the reused\nreply buffer, not the number of bytes actually received.\n\nA truncated reply can therefore pass ceph_decode_need() and decode the\nsecond u64 from stale tail bytes left in the buffer by an earlier\nmessage, causing an uninitialized memory read.\n\nUse msg-\u003efront.iov_len as the receive-side decode boundary, matching\nother libceph reply handlers and limiting decoding to the bytes that\nwere actually read from the wire."
        }
      ],
      "metrics": [
        {
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            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The malformed MON_GET_VERSION_REPLY arrives over the ceph messenger TCP connection to a monitor; a malicious/compromised ceph-mon or an on-path attacker on the msgr1/crc-mode session triggers the bug purely with received network data.\nAC:L - The attacker fully controls the reply\u0027s hdr.front_len and tid, so truncating the reply to 8 bytes reliably makes the handler decode past the received data every time; no race or memory-layout condition outside attacker control is involved.\nPR:N - The vulnerable decode runs on any reply the client accepts for an outstanding generic request; the attacker acts as the remote server/peer and needs no credentials or account on the victim kernel client.\nUI:N - An already-mounted CephFS/RBD client issues mon_get_version requests automatically (osdmap checks, pool-dne checks, remount/latest-map waits), so no local user action is needed once the client is connected.\nS:U - The uninitialized read and the resulting bogus epoch stay within the kernel\u0027s own libceph client state; no security authority other than the affected kernel is impacted.\nC:L - Eight bytes of uninitialized kvmalloc\u0027d heap (or stale bytes of a prior reply) are consumed as req-\u003eu.newest; the read stays inside the 32-byte allocation and is not copied to userspace, so it is a small bounded uninitialized-memory disclosure that only leaks indirectly through client behaviour.\nI:L - The attacker causes kernel state (req-\u003eu.newest, r_map_dne_bound, linger map_dne_bound) to be populated from uninitialized memory rather than the wire, corrupting osdmap-epoch bookkeeping and leading to wrong pool-does-not-exist decisions, but gives no arbitrary write.\nA:H - A zero stale value trips WARN_ON(greq-\u003eresult || !greq-\u003eu.newest) in map_check_cb()/linger_map_check_cb() (panic with panic_on_warn), while a huge garbage epoch makes ceph_monc_wait_osdmap() block until mount_timeout or indefinitely and makes check_pool_dne() abort in-flight requests with -ENOENT; all repeatable at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:35:33.508Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/72a35070fcefa229b1b031aa7482ad3788e18f07"
        },
        {
          "url": "https://git.kernel.org/stable/c/340e0386aa39da181015bee38f309018c335ce16"
        },
        {
          "url": "https://git.kernel.org/stable/c/d60de8253c85a02d0e6194b0735e7a562981a04c"
        },
        {
          "url": "https://git.kernel.org/stable/c/4e7ebfaa0d14cf50e44041bfde38070d6dbc019f"
        },
        {
          "url": "https://git.kernel.org/stable/c/0d934c934ec746d53fc7e4f53239792647bbae63"
        },
        {
          "url": "https://git.kernel.org/stable/c/d3c32939fa0e3ee9b883b9a0fd1972c5c444e3d0"
        }
      ],
      "title": "libceph: bound get_version reply decode to front len",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68433",
    "datePublished": "2026-08-12T00:07:20.455Z",
    "dateReserved": "2026-07-30T09:28:09.393Z",
    "dateUpdated": "2026-08-19T16:35:33.508Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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.
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GHSA-W6PJ-FV9F-22WF

CVE-2026-68433 (GCVE-0-2026-68433)

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