CVE-2026-31500 (GCVE-0-2026-31500)

Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-06-01 16:11
VLAI
Title
Bluetooth: btintel: serialize btintel_hw_error() with hci_req_sync_lock
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btintel: serialize btintel_hw_error() with hci_req_sync_lock btintel_hw_error() issues two __hci_cmd_sync() calls (HCI_OP_RESET and Intel exception-info retrieval) without holding hci_req_sync_lock(). This lets it race against hci_dev_do_close() -> btintel_shutdown_combined(), which also runs __hci_cmd_sync() under the same lock. When both paths manipulate hdev->req_status/req_rsp concurrently, the close path may free the response skb first, and the still-running hw_error path hits a slab-use-after-free in kfree_skb(). Wrap the whole recovery sequence in hci_req_sync_lock/unlock so it is serialized with every other synchronous HCI command issuer. Below is the data race report and the kasan report: BUG: data-race in __hci_cmd_sync_sk / btintel_shutdown_combined read of hdev->req_rsp at net/bluetooth/hci_sync.c:199 by task kworker/u17:1/83: __hci_cmd_sync_sk+0x12f2/0x1c30 net/bluetooth/hci_sync.c:200 __hci_cmd_sync+0x55/0x80 net/bluetooth/hci_sync.c:223 btintel_hw_error+0x114/0x670 drivers/bluetooth/btintel.c:254 hci_error_reset+0x348/0xa30 net/bluetooth/hci_core.c:1030 write/free by task ioctl/22580: btintel_shutdown_combined+0xd0/0x360 drivers/bluetooth/btintel.c:3648 hci_dev_close_sync+0x9ae/0x2c10 net/bluetooth/hci_sync.c:5246 hci_dev_do_close+0x232/0x460 net/bluetooth/hci_core.c:526 BUG: KASAN: slab-use-after-free in sk_skb_reason_drop+0x43/0x380 net/core/skbuff.c:1202 Read of size 4 at addr ffff888144a738dc by task kworker/u17:1/83: __hci_cmd_sync_sk+0x12f2/0x1c30 net/bluetooth/hci_sync.c:200 __hci_cmd_sync+0x55/0x80 net/bluetooth/hci_sync.c:223 btintel_hw_error+0x186/0x670 drivers/bluetooth/btintel.c:260
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: 973bb97e5aee56edddaae3d5c96877101ad509c0 , < 7e041d0aad1d4d43d921ace052e04f4e2cacaed3 (git)
Affected: 973bb97e5aee56edddaae3d5c96877101ad509c0 , < 5f84e845648dfa86e42de5487f1a774b42f0444d (git)
Affected: 973bb97e5aee56edddaae3d5c96877101ad509c0 , < e10a4cb72468686ffbe8bb2b0520e37f6be1a0c5 (git)
Affected: 973bb97e5aee56edddaae3d5c96877101ad509c0 , < 66696648af477dc87859e5e4b607112f5f29d010 (git)
Affected: 973bb97e5aee56edddaae3d5c96877101ad509c0 , < f7d84737663ad4a120d2d8ef1561a4df91282c2e (git)
Affected: 973bb97e5aee56edddaae3d5c96877101ad509c0 , < 94d8e6fe5d0818e9300e514e095a200bd5ff93ae (git)
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Linux Linux Affected: 4.3
Unaffected: 0 , < 4.3 (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.131 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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When both paths manipulate\\nhdev-\u003ereq_status/req_rsp concurrently, the close path may free the\\nresponse skb first, and the still-running hw_error path hits a\\nslab-use-after-free in kfree_skb().\\n\\nWrap the whole recovery sequence in hci_req_sync_lock/unlock so it\\nis serialized with every other synchronous HCI command issuer.\\n\\nBelow is the data race report and the kasan report:\\n\\n  BUG: data-race in __hci_cmd_sync_sk / btintel_shutdown_combined\\n\\n  read of hdev-\u003ereq_rsp at net/bluetooth/hci_sync.c:199\\n  by task kworker/u17:1/83:\\n   __hci_cmd_sync_sk+0x12f2/0x1c30 net/bluetooth/hci_sync.c:200\\n   __hci_cmd_sync+0x55/0x80 net/bluetooth/hci_sync.c:223\\n   btintel_hw_error+0x114/0x670 drivers/bluetooth/btintel.c:254\\n   hci_error_reset+0x348/0xa30 net/bluetooth/hci_core.c:1030\\n\\n  write/free by task ioctl/22580:\\n   btintel_shutdown_combined+0xd0/0x360\\n    drivers/bluetooth/btintel.c:3648\\n   hci_dev_close_sync+0x9ae/0x2c10 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:25:49+00:00",
      "cve": "CVE-2026-31500",
      "id": "CVE-2026-31500",
      "initial_release_date": "2026-04-22T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: btintel: serialize btintel_hw_error() with hci_req_sync_lock",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31500.json",
      "version": "3"
    }
  }
}



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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

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.