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

Vulnerability from cvelistv5 – Published: 2026-05-08 14:21 – Updated: 2026-08-05 12:27
VLAI
Title
libceph: prevent potential out-of-bounds reads in process_message_header()
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.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
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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)
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    "datePublished": "2026-05-08T14:21:46.246Z",
    "dateReserved": "2026-05-01T14:12:56.007Z",
    "dateUpdated": "2026-08-05T12:27:49.364Z",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-02T12:46:50+00:00",
      "cve": "CVE-2026-43406",
      "id": "CVE-2026-43406",
      "initial_release_date": "2026-05-08T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: libceph: prevent potential out-of-bounds reads in process_message_header()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43406.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:17:54Z",
      "cve": "CVE-2026-43406",
      "id": "CVE-2026-43406",
      "initial_release_date": "2026-05-13T03:34:20Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "528",
      "product_status:known_not_affected": "175",
      "product_status:recommended": "279",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43406",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43406.json",
      "version": "20"
    }
  }
}



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  • 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.
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  • 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.


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