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

Vulnerability from cvelistv5 – Published: 2026-06-24 16:28 – Updated: 2026-08-05 12:32
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)
Create a notification for this product.
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{
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        }
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              "value": "AV:N - CEPH_MSG_OSD_MAP is received over Ceph monitor or OSD network connections and decoded by the kernel client. The vulnerable path is network message processing: messenger receive -\u003e ceph_osdc_handle_map() -\u003e ceph_osdmap_decode()/osdmap_apply_incremental() -\u003e crush_decode() -\u003e decode_choose_args().\nAC:L - The attacker-controlled map can directly select a bucket_index within max_buckets whose bucket slot was decoded as NULL and set ids_size nonzero. No race or condition outside the sending peer\u0027s control is required.\nPR:N - The message must pass the established Ceph connection/authentication and FSID gates, but a malicious or compromised Ceph peer needs no privileges on the vulnerable Linux system. Auth-none deployments and attacker-controlled Ceph peers make PR:N the highest defensible choice.\nUI:N - Once the kernel client is connected to the Ceph cluster, OSD map updates are processed asynchronously without a user opening a file or performing another action. A malicious peer can send the malformed map as normal cluster traffic.\nS:U - The impact is within the same vulnerable kernel security authority. This is not a VM escape, IOMMU bypass, or cross-scope sandbox escape.\nC:N - The bug is a NULL pointer dereference while reading c-\u003ebuckets[bucket_index]-\u003esize. It does not provide a data disclosure primitive.\nI:N - The vulnerable operation is not a write, UAF, type confusion, or controllable memory corruption. No integrity impact is supported beyond crashing the kernel.\nA:H - Dereferencing the NULL bucket pointer can trigger a kernel oops or panic while processing a malformed OSD/CRUSH map. That is a high availability impact."
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    "dateReserved": "2026-06-09T07:44:35.373Z",
    "dateUpdated": "2026-08-05T12:32:07.425Z",
    "state": "PUBLISHED"
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      "title": "libceph: Fix potential null-ptr-deref in decode_choose_args()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-52957.json",
      "version": "3"
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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. Now, it is\\nonly attempted to access the bucket if it is not 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T14:40:45+00:00",
      "cve": "CVE-2026-52957",
      "id": "CVE-2026-52957",
      "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: Fix potential null-ptr-deref in decode_choose_args()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52957.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-06T01:15:40Z",
      "cve": "CVE-2026-52957",
      "id": "CVE-2026-52957",
      "initial_release_date": "2026-06-26T02:14:45Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "590",
      "product_status:recommended": "302",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-52957",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-52957.json",
      "version": "9"
    }
  }
}



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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.