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CVE-2024-26689 (GCVE-0-2024-26689)

Vulnerability from cvelistv5 – Published: 2024-04-03 14:54 – Updated: 2026-08-05 11:26
VLAI
Title
ceph: prevent use-after-free in encode_cap_msg()
Summary
In the Linux kernel, the following vulnerability has been resolved: ceph: prevent use-after-free in encode_cap_msg() In fs/ceph/caps.c, in encode_cap_msg(), "use after free" error was caught by KASAN at this line - 'ceph_buffer_get(arg->xattr_buf);'. This implies before the refcount could be increment here, it was freed. In same file, in "handle_cap_grant()" refcount is decremented by this line - 'ceph_buffer_put(ci->i_xattrs.blob);'. It appears that a race occurred and resource was freed by the latter line before the former line could increment it. encode_cap_msg() is called by __send_cap() and __send_cap() is called by ceph_check_caps() after calling __prep_cap(). __prep_cap() is where arg->xattr_buf is assigned to ci->i_xattrs.blob. This is the spot where the refcount must be increased to prevent "use after free" error.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-08-15 19:26 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9030aaf9bf0a1eee47a154c316c789e959638b0f , < 8180d0c27b93a6eb60da1b08ea079e3926328214 (git)
Affected: 9030aaf9bf0a1eee47a154c316c789e959638b0f , < 70e329b440762390258a6fe8c0de93c9fdd56c77 (git)
Affected: 9030aaf9bf0a1eee47a154c316c789e959638b0f , < f3f98d7d84b31828004545e29fd7262b9f444139 (git)
Affected: 9030aaf9bf0a1eee47a154c316c789e959638b0f , < ae20db45e482303a20e56f2db667a9d9c54ac7e7 (git)
Affected: 9030aaf9bf0a1eee47a154c316c789e959638b0f , < 7958c1bf5b03c6f1f58e724dbdec93f8f60b96fc (git)
Affected: 9030aaf9bf0a1eee47a154c316c789e959638b0f , < cda4672da1c26835dcbd7aec2bfed954eda9b5ef (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.34
Unaffected: 0 , < 2.6.34 (semver)
Unaffected: 5.10.210 , ≤ 5.10.* (semver)
Unaffected: 5.15.149 , ≤ 5.15.* (semver)
Unaffected: 6.1.79 , ≤ 6.1.* (semver)
Unaffected: 6.6.18 , ≤ 6.6.* (semver)
Unaffected: 6.7.6 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
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Parece que se produjo una ejecuci\u00f3n y la \u00faltima l\u00ednea liber\u00f3 el recurso antes de que la primera l\u00ednea pudiera incrementarlo. __send_cap() llama a encode_cap_msg() y ceph_check_caps() llama a __send_cap() despu\u00e9s de llamar a __prep_cap(). __prep_cap() es donde arg-\u0026gt;xattr_buf se asigna a ci-\u0026gt;i_xattrs.blob. 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:10:43+00:00",
      "cve": "CVE-2024-26689",
      "id": "CVE-2024-26689",
      "initial_release_date": "2024-04-03T00:00:00+00:00",
      "product_status:known_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ceph: prevent use-after-free in encode_cap_msg()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26689.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-01T01:13:24Z",
      "cve": "CVE-2024-26689",
      "id": "CVE-2024-26689",
      "initial_release_date": "2024-04-10T02:16:40Z",
      "product_status:known_affected": "476",
      "product_status:known_not_affected": "57",
      "product_status:recommended": "813",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-26689",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-26689.json",
      "version": "68"
    },
    "vulnrichment": {
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      "cveMetadata": "{\"cveId\": \"CVE-2024-26689\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:26:42.116Z\", \"dateReserved\": \"2024-02-19T14:20:24.154Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-03T14:54:50.885Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.


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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.