CVE-2026-46138 (GCVE-0-2026-46138)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:35 – Updated: 2026-06-14 17:57
VLAI
Title
Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt hci_le_create_big_complete_evt() iterates over BT_BOUND connections for a BIG handle using a while loop, accessing ev->bis_handle[i++] on each iteration. However, there is no check that i stays within ev->num_bis before the array access. When a controller sends a LE_Create_BIG_Complete event with fewer bis_handle entries than there are BT_BOUND connections for that BIG, or with num_bis=0, the loop reads beyond the valid bis_handle[] flex array into adjacent heap memory. Since the out-of-bounds values typically exceed HCI_CONN_HANDLE_MAX (0x0EFF), hci_conn_set_handle() rejects them and the connection remains in BT_BOUND state. The same connection is then found again by hci_conn_hash_lookup_big_state(), creating an infinite loop with hci_dev_lock held. Fix this by terminating the BIG if in case not all BIS could be setup properly.
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
Linux Linux Affected: a0bfde167b506423111ddb8cd71930497a40fc54 , < 6cb7f67bc28da787499291a562d49a084d9c90cd (git)
Affected: a0bfde167b506423111ddb8cd71930497a40fc54 , < 22559ad7654f61727fc270ee4893da9f4b70cf17 (git)
Affected: a0bfde167b506423111ddb8cd71930497a40fc54 , < 77981a507aa0fc001dc37f0dd6631dd2042fed17 (git)
Affected: a0bfde167b506423111ddb8cd71930497a40fc54 , < 665da0baaf0396f9ed3c86ccb3955dcd0b73e774 (git)
Affected: a0bfde167b506423111ddb8cd71930497a40fc54 , < 5ddb8014261137cadaf83ab5617a588d80a22586 (git)
Affected: b475c1109251e30ec21fb574d72a1c71a4ab0039 (git)
Affected: 2ccde10127447c1a5caad8469fede945bdb62fdf (git)
Affected: 6.4.16 , < 6.5 (semver)
Affected: 6.5.3 , < 6.6 (semver)
Create a notification for this product.
Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.30 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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      "cve": "CVE-2026-46138",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt",
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      "cve": "CVE-2026-46138",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46138",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46138.json",
      "version": "8"
    }
  }
}



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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.

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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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