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CVE-2026-53254 (GCVE-0-2026-53254)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-08-05 12:34
VLAI
Title
Bluetooth: RFCOMM: validate skb length in MCC handlers
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: validate skb length in MCC handlers The RFCOMM MCC handlers cast skb->data to protocol-specific structs without validating skb->len first. A malicious remote device can send truncated MCC frames and trigger out-of-bounds reads in these handlers. Fix this by using skb_pull_data() to validate and access the required data before dereferencing it. rfcomm_recv_rpn() requires special handling since ETSI TS 07.10 allows 1-byte RPN requests. Handle this by validating only the DLCI byte first, and validating the full struct only when len > 1.
Severity
8.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7c15c7c2878957cbfed93bcc29c13fdace464254 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0d637136ce89f9a2309b2c3502402ce400dab0ef (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 98377e6b1a1a56561ec66a181573ea2b61b2079e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1b070ac9e99c2c2c3a8112943ca98ab6fca7f10c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3eabc6d47a0ad22b053329997aaf0ec1e581e392 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 23882b828c3c8c51d0c946446a396b10abb3b16b (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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Handle this by validating only the DLCI byte first,\\nand validating the full struct only when len \u003e 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-14T11:47:42+00:00",
      "cve": "CVE-2026-53254",
      "id": "CVE-2026-53254",
      "initial_release_date": "2026-06-25T00:00:00+00:00",
      "product_status:fixed": "612",
      "product_status:known_affected": "112",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: RFCOMM: validate skb length in MCC handlers",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53254.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-16T00:11:08Z",
      "cve": "CVE-2026-53254",
      "id": "CVE-2026-53254",
      "initial_release_date": "2026-06-26T02:08:31Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "621",
      "product_status:known_not_affected": "17",
      "product_status:recommended": "356",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53254",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53254.json",
      "version": "14"
    }
  }
}



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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.