Vulnerability-Lookup

FKIE_CVE-2026-43406

Vulnerability from fkie_nvd - Published: 2026-05-08 15:16 - Updated: 2026-06-17 10:49

Severity

9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: libceph: prevent potential out-of-bounds reads in process_message_header() If the message frame is (maliciously) corrupted in a way that the length of the control segment ends up being less than the size of the message header or a different frame is made to look like a message frame, out-of-bounds reads may ensue in process_message_header(). Perform an explicit bounds check before decoding the message header.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/035867ae6f18df0aeedb2a57a5b74091bd4e3fe8	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/50156622eb0888e62541d715a98584480a1bc7cb	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/69fb5d91bba44ecf7eb80530b85fa4fb028921d5	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/69fe5af33fa3806f398d21c081d73c66e5523bc2	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/75582aaa580c11aed4c7731cad6b068b700e7efb	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/76ccf21a12c5f6d6790bc32c7da82446d877b2f4	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/dbd857a9e1e33ea71eaf3e211877027e533770d1	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ceph/messenger_v2.c"
          ],
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          "vendor": "Linux",
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            },
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              "status": "unaffected",
              "version": "6.1.167",
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            },
            {
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              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.12.78",
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            },
            {
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              "status": "unaffected",
              "version": "6.18.19",
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            },
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              "status": "unaffected",
              "version": "6.19.9",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
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    }
  ],
  "configurations": [
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: prevent potential out-of-bounds reads in process_message_header()\n\nIf the message frame is (maliciously) corrupted in a way that the\nlength of the control segment ends up being less than the size of the\nmessage header or a different frame is made to look like a message\nframe, out-of-bounds reads may ensue in process_message_header().\n\nPerform an explicit bounds check before decoding the message header."
    }
  ],
  "id": "CVE-2026-43406",
  "lastModified": "2026-06-17T10:49:32.170",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-08T15:16:52.137",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2026-43406 (GCVE-0-2026-43406)

Vulnerability from cvelistv5 – Published: 2026-05-08 14:21 – Updated: 2026-08-05 12:27

Title

libceph: prevent potential out-of-bounds reads in process_message_header()

Summary

Severity

9.1 (Critical)


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

Assigner

Linux mitre root

References

7 references

URL	Tags
https://git.kernel.org/stable/c/76ccf21a12c5f6d67…
https://git.kernel.org/stable/c/75582aaa580c11aed…
https://git.kernel.org/stable/c/50156622eb0888e62…
https://git.kernel.org/stable/c/dbd857a9e1e33ea71…
https://git.kernel.org/stable/c/69fe5af33fa3806f3…
https://git.kernel.org/stable/c/035867ae6f18df0ae…
https://git.kernel.org/stable/c/69fb5d91bba44ecf7…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < 76ccf21a12c5f6d6790bc32c7da82446d877b2f4 (git) Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < 75582aaa580c11aed4c7731cad6b068b700e7efb (git) Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < 50156622eb0888e62541d715a98584480a1bc7cb (git) Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < dbd857a9e1e33ea71eaf3e211877027e533770d1 (git) Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < 69fe5af33fa3806f398d21c081d73c66e5523bc2 (git) Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < 035867ae6f18df0aeedb2a57a5b74091bd4e3fe8 (git) Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < 69fb5d91bba44ecf7eb80530b85fa4fb028921d5 (git)
Linux	Linux	Affected: 5.11 Unaffected: 0 , < 5.11 (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.167 , ≤ 6.1.* (semver) Unaffected: 6.6.130 , ≤ 6.6.* (semver) Unaffected: 6.12.78 , ≤ 6.12.* (semver) Unaffected: 6.18.19 , ≤ 6.18.* (semver) Unaffected: 6.19.9 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ceph/messenger_v2.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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            {
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              "version": "6.19.9",
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        }
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          },
          "scenarios": [
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              "lang": "en",
              "value": "AV:N - The vulnerable libceph messenger v2 path is reached by TCP data received from a Ceph peer, and the reproducer triggers it over the network against a kernel Ceph client.\nAC:L - The bug is deterministic: a peer sends a FRAME_TAG_MESSAGE frame with a control segment shorter than struct ceph_msg_header2 in msgr2 crc/non-secure mode. No race or attacker-uncontrolled timing condition is required.\nPR:N - The vulnerable read can occur during CEPH_CON_S_V2_HELLO or CEPH_CON_S_V2_AUTH before credentials are verified, so the network peer does not need authenticated privileges.\nUI:N - In a reasonable deployment with an already configured or reconnecting Ceph client, a malicious or spoofed Ceph peer can send the frame without further victim action.\nS:U - The impact is within the kernel/libceph client security scope and does not cross a VM, IOMMU, or other separate security authority boundary.\nC:H - The flaw is a slab out-of-bounds read of attacker-triggered kernel memory beyond a too-small control buffer. Following the required guidance, an out-of-bounds read that is not strictly limited to only a few bytes is scored High for confidentiality.\nI:N - The defect is an out-of-bounds read, and the investigated path does not provide an out-of-bounds write, memory corruption, or authenticated message dispatch that would directly modify data.\nA:H - The malformed network frame deterministically triggers a KASAN-detected slab out-of-bounds access in the ceph-msgr workqueue and can fault/disrupt the Ceph client connection. Repeated unauthenticated triggering can deny availability of kernel Ceph storage access."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:27:49.364Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/76ccf21a12c5f6d6790bc32c7da82446d877b2f4"
        },
        {
          "url": "https://git.kernel.org/stable/c/75582aaa580c11aed4c7731cad6b068b700e7efb"
        },
        {
          "url": "https://git.kernel.org/stable/c/50156622eb0888e62541d715a98584480a1bc7cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/dbd857a9e1e33ea71eaf3e211877027e533770d1"
        },
        {
          "url": "https://git.kernel.org/stable/c/69fe5af33fa3806f398d21c081d73c66e5523bc2"
        },
        {
          "url": "https://git.kernel.org/stable/c/035867ae6f18df0aeedb2a57a5b74091bd4e3fe8"
        },
        {
          "url": "https://git.kernel.org/stable/c/69fb5d91bba44ecf7eb80530b85fa4fb028921d5"
        }
      ],
      "title": "libceph: prevent potential out-of-bounds reads in process_message_header()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43406",
    "datePublished": "2026-05-08T14:21:46.246Z",
    "dateReserved": "2026-05-01T14:12:56.007Z",
    "dateUpdated": "2026-08-05T12:27:49.364Z",
    "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.

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.

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.