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CVE-2026-53073— Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error

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基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于hci_ldisc中错误处理不当，未在调用hu->proto->close()前清除HCI_UART_PROTO_INIT标志，可能导致UART数据在资源释放后访问协议接收处理器，造成空指针取消引用。

AI Predicted 4.4 Difficulty: Hard EPSS 0.11% · P1

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 29

VendorProduct Version RangeStatus
Linux Linux a40f94f7caa8d3421b64f63ac31bc0f24c890f39< ebb39b2d81731b83ee71a1ba6dd0291a57b5ac07 affected
9e5a0f5777162e503400c70c6ed25fbbe2d38799< ed4033fb85ccaaf6c3983be3c7b037e48253d232 affected
80f14e9de6a43a0bd8194cad1003a3e6dcbc3984< 356dee1bcac4d0d9152390561fa63331ebff211b affected
02e1bcdfdf769974e7e9fa285e295cd9852e2a38< a673cf6c4ac702cb79ac1f4d7fc4de763a6a3e40 affected
281782d2c6730241e300d630bb9f200d831ede71< f4b69c35813c432973d340d3600c01de106ed474 affected
5df5dafc171b90d0b8d51547a82657cd5a1986c7< 3daa5818e473ed60eb69d8b5c71b651909d28c5a affected
5df5dafc171b90d0b8d51547a82657cd5a1986c7< 194f029a4d7f739e44ebc1f473120187b4de5104 affected
5df5dafc171b90d0b8d51547a82657cd5a1986c7< 68d39ea5e0adc9ecaea1ce8abd842ec972eb8718 affected
… +21 more rows
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I. Basic Information for CVE-2026-53073

Vulnerability Information
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Vulnerability Title
Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error When hci_register_dev() fails in hci_uart_register_dev() HCI_UART_PROTO_INIT is not cleared before calling hu->proto->close(hu) and setting hu->hdev to NULL. This means incoming UART data will reach the protocol-specific recv handler in hci_uart_tty_receive() after resources are freed. Clear HCI_UART_PROTO_INIT with a write lock before calling hu->proto->close() and setting hu->hdev to NULL. The write lock ensures all active readers have completed and no new reader can enter the protocol recv path before resources are freed. This allows the protocol-specific recv functions to remove the "HCI_UART_REGISTERED" guard without risking a null pointer dereference if hci_register_dev() fails.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于hci_ldisc中错误处理不当，未在调用hu->proto->close()前清除HCI_UART_PROTO_INIT标志，可能导致UART数据在资源释放后访问协议接收处理器，造成空指针取消引用。
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 a40f94f7caa8d3421b64f63ac31bc0f24c890f39 ~ ebb39b2d81731b83ee71a1ba6dd0291a57b5ac07 -
Linux Linux 6.15 -

II. Public POCs for CVE-2026-53073

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III. Intelligence Information for CVE-2026-53073

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Patches & Fixes for CVE-2026-53073 (8)

Same Patch Batch · Linux · 2026-06-24 · 219 CVEs total

CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
CVE-2026-52993 9.8 CRITICAL tipc: fix double-free in tipc_buf_append()
CVE-2026-52989 9.8 CRITICAL nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-52986 9.8 CRITICAL netfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-52982 9.8 CRITICAL net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-52924 9.8 CRITICAL sctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-52931 9.8 CRITICAL batman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching
CVE-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()

Showing top 20 of 219 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53073

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