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CVE-2026-63974— Bluetooth: hci_sync: Set HCI_CMD_DRAIN_WORKQUEUE during device close

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于在设备关闭期间未正确设置HCI_CMD_DRAIN_WORKQUEUE，可能导致在hdev工作队列被清空时排队超时。以下版本受到影响：6.0版本。

CVSS 8.8 · High EPSS 0.38% · P31

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 877afadad2dce8aae1f2aad8ce47e072d4f6165e< 9cebe4680bb9a72f80c6541eb24af06db7a1fbc9 affected
877afadad2dce8aae1f2aad8ce47e072d4f6165e< 47330cc875b36a1cf7b3543cb2cf90a7c603ce0e affected
877afadad2dce8aae1f2aad8ce47e072d4f6165e< 60bceb9a4c693e68cc90ba4b2dfb9e000e8638ff affected
877afadad2dce8aae1f2aad8ce47e072d4f6165e< 525daaea459fc215f432de1b8debbd9144bf97b0 affected
4bf367fa1fefabdf14938d0ac9ed60020389112e affected
3b382555706558f5c0587862b6dc03e96a252bba affected
5.18.18< 5.19 affected
5.19.2< 5.20 affected
… +6 more rows
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I. Basic Information for CVE-2026-63974

Vulnerability Information
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Vulnerability Title
Bluetooth: hci_sync: Set HCI_CMD_DRAIN_WORKQUEUE during device close
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Set HCI_CMD_DRAIN_WORKQUEUE during device close Since hci_dev_close_sync() can now be called during the reset path, we should also set HCI_CMD_DRAIN_WORKQUEUE. This avoids queuing timeouts while the hdev workqueue is being drained.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于在设备关闭期间未正确设置HCI_CMD_DRAIN_WORKQUEUE，可能导致在hdev工作队列被清空时排队超时。以下版本受到影响：6.0版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 877afadad2dce8aae1f2aad8ce47e072d4f6165e ~ 9cebe4680bb9a72f80c6541eb24af06db7a1fbc9 -
Linux Linux 6.0 -

II. Public POCs for CVE-2026-63974

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III. Intelligence Information for CVE-2026-63974

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Patches & Fixes for CVE-2026-63974 (4)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-53399 9.8 CRITICAL nfsd: release layout stid on setlease failure
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-64089 9.8 CRITICAL batman-adv: tt: fix negative last_changeset_len
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-64055 9.8 CRITICAL net: ethernet: cortina: Carry over frag counter
CVE-2026-63924 9.8 CRITICAL ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()
CVE-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-64037 9.8 CRITICAL wifi: iwlwifi: mld: fix TSO segmentation explosion when AMSDU is disabled
CVE-2026-63888 9.8 CRITICAL scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-64136 9.8 CRITICAL smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-64061 9.8 CRITICAL netfs: Fix early put of sink folio in netfs_read_gaps()
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-64102 9.8 CRITICAL RDMA/siw: Reject MPA FPDU length underflow before signed receive math
CVE-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-63974

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