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CVE-2026-52954 (GCVE-0-2026-52954)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:28 – Updated: 2026-08-05 12:32
VLAI
Title
libceph: handle rbtree insertion error in decode_choose_args()
Summary
In the Linux kernel, the following vulnerability has been resolved: libceph: handle rbtree insertion error in decode_choose_args() A message of type CEPH_MSG_OSD_MAP contains an OSD map that itself contains a CRUSH map. The received CRUSH map may optionally contain choose_args that get decoded in decode_choose_args(). In this function, num_choose_arg_maps is read from the message, and a corresponding number of crush_choose_arg_maps gets decoded afterwards. Each crush_choose_arg_map has a choose_args_index, which serves as the key when inserting it into the choose_args rbtree of the decoded crush_map. If a (potentially corrupted) message contains two crush_choose_arg_maps with the same index, the assertion in insert_choose_arg_map() triggers a kernel BUG when trying to insert the second crush_choose_arg_map. This patch fixes the issue by switching to the non-asserting rbtree insertion function and rejecting the message if the insertion fails. [ idryomov: changelog ]
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5cf9c4a9959b6273675310d14a834ef14fbca37c , < c7bf7864e2924fa5508ac270b0e9364bc13d5a6c (git)
Affected: 5cf9c4a9959b6273675310d14a834ef14fbca37c , < f47430fc1f815e87406e2d3b4e476eff1bc7fd9b (git)
Affected: 5cf9c4a9959b6273675310d14a834ef14fbca37c , < 0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da (git)
Affected: 5cf9c4a9959b6273675310d14a834ef14fbca37c , < 534ebc08df97c47d4c7596f336fa31ecbf91519c (git)
Affected: 5cf9c4a9959b6273675310d14a834ef14fbca37c , < 80c73bd1b2b04355d1d0c29be8ccbd25a380905d (git)
Affected: 5cf9c4a9959b6273675310d14a834ef14fbca37c , < 4d2b37abda9536808655830d683dc491d31741a8 (git)
Affected: 5cf9c4a9959b6273675310d14a834ef14fbca37c , < 0a1265a9ab875f92b6a3ffb497404f46cf9d76a3 (git)
Affected: 5cf9c4a9959b6273675310d14a834ef14fbca37c , < d289478cfc0bcf81c7914200d6abdcb78bd04ded (git)
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Linux Linux Affected: 4.13
Unaffected: 0 , < 4.13 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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Each\\ncrush_choose_arg_map has a choose_args_index, which serves as the key\\nwhen inserting it into the choose_args rbtree of the decoded crush_map.\\nIf a (potentially corrupted) message contains two crush_choose_arg_maps\\nwith the same index, the assertion in insert_choose_arg_map() triggers a\\nkernel BUG when trying to insert the second crush_choose_arg_map.\\n\\nThis patch fixes the issue by switching to the non-asserting rbtree\\ninsertion function and rejecting the message if the insertion fails.\\n\\n[ idryomov: changelog 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T14:40:35+00:00",
      "cve": "CVE-2026-52954",
      "id": "CVE-2026-52954",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: libceph: handle rbtree insertion error in decode_choose_args()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52954.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T13:36:02Z",
      "cve": "CVE-2026-52954",
      "id": "CVE-2026-52954",
      "initial_release_date": "2026-06-26T02:14:50Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "639",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "287",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-52954",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-52954.json",
      "version": "12"
    }
  }
}



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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

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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.