CVE-2026-43019 (GCVE-0-2026-43019)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:15 – Updated: 2026-08-05 12:25
VLAI
Title
Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync hci_conn lookup and field access must be covered by hdev lock in set_cig_params_sync, otherwise it's possible it is freed concurrently. Take hdev lock to prevent hci_conn from being deleted or modified concurrently. Just RCU lock is not suitable here, as we also want to avoid "tearing" in the configuration.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a091289218202bc09d9b9caa8afcde1018584aec , < 7502c1cf303b69f71d085f5ff7251b0e1b0f09df (git)
Affected: a091289218202bc09d9b9caa8afcde1018584aec , < 66d432e9b45bae7881ffcdb12cd8fd0bf254ef02 (git)
Affected: a091289218202bc09d9b9caa8afcde1018584aec , < 7d568fede8eac91161a60b710aa920abe9b0fb9f (git)
Affected: a091289218202bc09d9b9caa8afcde1018584aec , < bad65b4b0a96139f023eadc28a33125963208449 (git)
Affected: a091289218202bc09d9b9caa8afcde1018584aec , < a2639a7f0f5bf7d73f337f8f077c19415c62ed2c (git)
Affected: 3a273cd0f47dd672d37736e623849374f9ab9ce9 (git)
Affected: d8570c4c3f2a3e51b3c8b5e6ec898364c5c03062 (git)
Affected: 6.4.16 , < 6.5 (semver)
Affected: 6.5.3 , < 6.6 (semver)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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{
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              "value": "AV:L - The vulnerable `set_cig_params_sync` path is reached through local AF_BLUETOOTH ISO socket operations such as creating a `BTPROTO_ISO` socket, setting ISO QoS/deferred setup, and calling `connect()` or deferred `recvmsg()`. A Bluetooth peer may be involved in normal CIS use, but the vulnerable queueing and racing can be driven by local socket syscalls.\nAC:L - The bug is a race/use-after-free, but the attacker can control the relevant operations by repeatedly creating/binding/connecting and closing ISO sockets while the HCI command work item runs asynchronously. The fix adds `hci_dev_lock`, indicating normal locking, not rare external state, is the missing condition.\nPR:L - AF_BLUETOOTH ISO socket creation and the relevant `BT_ISO_QOS`, `BT_DEFER_SETUP`, and `connect()` path do not require CAP_NET_ADMIN or another privileged check in the inspected path. The attacker needs local code execution as an unprivileged user on a system with a running Bluetooth ISO-capable controller.\nUI:N - No victim action is required once the local attacker can execute socket syscalls. The attacker can create, configure, connect, and close the sockets directly.\nS:U - The vulnerability corrupts or reuses memory within the kernel Bluetooth/HCI connection management context. Exploitation would be kernel compromise or denial of service within the same security authority, not a boundary crossing such as guest-to-host escape.\nC:H - This is a use-after-free of `struct hci_conn`, with freed object fields read after lookup without holding the device lock. Per kernel UAF scoring guidance and plausible heap reuse, this can support high confidentiality impact.\nI:H - The stale `hci_conn` contents are used to build HCI command parameters, and UAF conditions in kernel heap objects are generally exploitable with heap grooming for control/data corruption. Following the required higher-severity rule for UAFs, integrity impact is High.\nA:H - A stale `hci_conn` dereference in asynchronous HCI command work can trigger kernel memory safety failures, including KASAN-detected slab-use-after-free, oops, or panic. Repeated local triggering makes denial of service high impact."
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Just RCU lock is not suitable here, as we also want to\\navoid \\\"tearing\\\" in the 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-02T12:49:23+00:00",
      "cve": "CVE-2026-43019",
      "id": "CVE-2026-43019",
      "initial_release_date": "2026-05-01T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43019.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-03T23:46:00Z",
      "cve": "CVE-2026-43019",
      "id": "CVE-2026-43019",
      "initial_release_date": "2026-05-07T02:19:50Z",
      "product_status:known_affected": "424",
      "product_status:known_not_affected": "196",
      "product_status:recommended": "120",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43019",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43019.json",
      "version": "9"
    }
  }
}



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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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  • 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.


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