CVE-2026-52957 (GCVE-0-2026-52957)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:28 – Updated: 2026-06-29 04:18
VLAI
Title
libceph: Fix potential null-ptr-deref in decode_choose_args()
Summary
In the Linux kernel, the following vulnerability has been resolved: libceph: Fix potential null-ptr-deref in decode_choose_args() A message of type CEPH_MSG_OSD_MAP contains an OSD map that itself contains a CRUSH map. When decoding this CRUSH map in crush_decode(), an array of max_buckets CRUSH buckets is decoded, where some indices may not refer to actual buckets and are therefore set to NULL. The received CRUSH map may optionally contain choose_args that get decoded in decode_choose_args(). When decoding a crush_choose_arg_map, a series of choose_args for different buckets is decoded, with the bucket_index being read from the incoming message. It is only checked that the bucket index does not exceed max_buckets, but not that it doesn't point to an index with a NULL bucket. If a (potentially corrupted) message contains a crush_choose_arg_map including such a bucket_index, a null pointer dereference may occur in the subsequent processing when attempting to access the bucket with the given index. This patch fixes the issue by extending the affected check. Now, it is only attempted to access the bucket if it is not NULL.
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
Linux Linux Affected: c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 , < d55ffad8d422b5d1cc44dad32bd3d25f4471cd9f (git)
Affected: c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 , < 301286c0ccd37d66b0e40786fd35a4f19cdbd88a (git)
Affected: c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 , < 7169f326a23d0f547fcd90e68b72fd387622e126 (git)
Affected: c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 , < d7a65a34d2453f8cd3e0cc0e1319740af7e24276 (git)
Affected: c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 , < 312ec973efac0efb9b9ed64214235910e9ecbaa8 (git)
Affected: c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 , < f2f95e6d4b97e70bb876139b0583fc8079983f85 (git)
Affected: c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 , < a20e16ebfe2fa65348eb4b2dc7deac330ce03e9c (git)
Affected: c7ed1a4bf4b446317eefa0f4916d94b1f6d3ada5 , < 28b0a2ab8c82d0bbdeb8013029c67c978ce6e4bf (git)
Create a notification for this product.
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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    "dateReserved": "2026-06-09T07:44:35.373Z",
    "dateUpdated": "2026-06-29T04:18:44.713Z",
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It is only checked that the bucket\\nindex does not exceed max_buckets, but not that it doesn\u0027t point to an\\nindex with a NULL bucket. If a (potentially corrupted) message contains\\na crush_choose_arg_map including such a bucket_index, a null pointer\\ndereference may occur in the subsequent processing when attempting to\\naccess the bucket with the given index.\\n\\nThis patch fixes the issue by extending the affected check. 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  }
}


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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.