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CVE-2026-43304 (GCVE-0-2026-43304)

Vulnerability from cvelistv5 – Published: 2026-05-08 13:11 – Updated: 2026-08-05 12:27
VLAI
Title
libceph: define and enforce CEPH_MAX_KEY_LEN
Summary
In the Linux kernel, the following vulnerability has been resolved: libceph: define and enforce CEPH_MAX_KEY_LEN When decoding the key, verify that the key material would fit into a fixed-size buffer in process_auth_done() and generally has a sane length. The new CEPH_MAX_KEY_LEN check replaces the existing check for a key with no key material which is a) not universal since CEPH_CRYPTO_NONE has to be excluded and b) doesn't provide much value since a smaller than needed key is just as invalid as no key -- this has to be handled elsewhere anyway.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < 6405e8c680974bb74e2c98d5249fb52c7b12a6c6 (git)
Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < 8d745d38c88ecbed95f6b2b39857bf89f35a3244 (git)
Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < e1dc45d97975f9db65694d234fbddf1915176e16 (git)
Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < 1b275bd49e58752efb83767a5d1aed41356c5e64 (git)
Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < c1a0f5f1e5e7e98c36a362ec3d1fcfd9932931ed (git)
Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < d82467c07b03a27c3c5469b62bb3b726305a80bb (git)
Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < ac431d597a9bdfc2ba6b314813f29a6ef2b4a3bf (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-14T11:37:43+00:00",
      "cve": "CVE-2026-43304",
      "id": "CVE-2026-43304",
      "initial_release_date": "2026-05-08T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: libceph: define and enforce CEPH_MAX_KEY_LEN",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43304.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:18:52Z",
      "cve": "CVE-2026-43304",
      "id": "CVE-2026-43304",
      "initial_release_date": "2026-05-13T03:35:38Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "528",
      "product_status:known_not_affected": "175",
      "product_status:recommended": "250",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43304",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43304.json",
      "version": "16"
    }
  }
}



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Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.


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.