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CVE-2026-53252— Bluetooth: fix memory leak in error path of hci_alloc_dev()

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Bluetooth HCI UART配置早期失败，导致SRCU percpu内存泄漏。以下版本受到影响：6.16版本。

AI Predicted 3.3 Difficulty: Trivial EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 24

VendorProduct Version RangeStatus
Linux Linux 90dee0a0ff84fac8accd5be98412b3819f667149< 5b7dfca6f852e6b9d809fd0263b5427cc9fb33fd affected
c56b177efce8b62798e4d96bdb9867106cb7c4a0< c016118b9e51eeaf5bc93850d4c455a3b583c0aa affected
bc0819a25e04cd68ef3568cfa51b63118fea39a7< 0622e527a31d4b44737fed5c1a2ac1fc2cfb5184 affected
ce23b73f0f27e2dbeb81734a79db710f05aa33c6< bc2efe73c194a74839d7cf57b63880d97e21d309 affected
1d6123102e9fbedc8d25bf4731da6d513173e49e< ce4b4cac3c5749b6aa75e62e2991ae2263f2f889 affected
1d6123102e9fbedc8d25bf4731da6d513173e49e< f82799407a50af7bcacacf09cc9b279af8fe9b81 affected
1d6123102e9fbedc8d25bf4731da6d513173e49e< 37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f affected
dd4becd3fd4102696e1c15e6d260a1712a2d8685 affected
… +16 more rows
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I. Basic Information for CVE-2026-53252

Vulnerability Information
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Vulnerability Title
Bluetooth: fix memory leak in error path of hci_alloc_dev()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix memory leak in error path of hci_alloc_dev() Early failures in Bluetooth HCI UART configuration leak SRCU percpu memory. When device initialization fails before hci_register_dev() completes, the HCI_UNREGISTER flag is never set. As a result, when the device reference count reaches zero, bt_host_release() evaluates this flag as false and falls back to a direct kfree(hdev). Because hci_release_dev() is bypassed, the SRCU struct initialized early in hci_alloc_dev() is never cleaned up, resulting in a leak of percpu memory. Fix the leak by explicitly calling cleanup_srcu_struct() in the fallback (unregistered) branch of bt_host_release() before freeing the device.
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Bluetooth HCI UART配置早期失败，导致SRCU percpu内存泄漏。以下版本受到影响：6.16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 90dee0a0ff84fac8accd5be98412b3819f667149 ~ 5b7dfca6f852e6b9d809fd0263b5427cc9fb33fd -
Linux Linux 6.16 -

II. Public POCs for CVE-2026-53252

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III. Intelligence Information for CVE-2026-53252

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Patches & Fixes for CVE-2026-53252 (6)

Same Patch Batch · Linux · 2026-06-25 · 146 CVEs total

CVE-2026-53176 9.8 CRITICAL IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
CVE-2026-53228 9.8 CRITICAL ipv6: sit: reload inner IPv6 header after GSO offloads
CVE-2026-53151 9.8 CRITICAL rxrpc: Fix the ACK parser to extract the SACK table for parsing
CVE-2026-53221 9.8 CRITICAL ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
CVE-2026-53247 9.8 CRITICAL net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
CVE-2026-53216 9.8 CRITICAL net: mvpp2: limit XDP frame size to the RX buffer
CVE-2026-53260 9.8 CRITICAL tcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().
CVE-2026-53246 9.8 CRITICAL sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
CVE-2026-53175 9.8 CRITICAL inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush
CVE-2026-53215 9.8 CRITICAL net: mvpp2: refill RX buffers before XDP or skb use
CVE-2026-53131 9.4 CRITICAL netfilter: require Ethernet MAC header before using eth_hdr()
CVE-2026-53225 9.1 CRITICAL sctp: fix uninit-value in __sctp_rcv_asconf_lookup()
CVE-2026-53224 9.1 CRITICAL sctp: validate embedded INIT chunk and address list lengths in cookie
CVE-2026-53186 9.1 CRITICAL RDMA/srp: bound SRP_RSP sense copy by the received length
CVE-2026-53240 8.8 HIGH xfrm: iptfs: fix use-after-free on first_skb in __input_process_payload
CVE-2026-53171 8.8 HIGH accel/ethosu: fix arithmetic issues in dma_length()
CVE-2026-53232 8.8 HIGH net: phy: clean the sfp upstream if phy probing fails
CVE-2026-53159 8.8 HIGH misc: fastrpc: fix DMA address corruption due to find_vma misuse
CVE-2026-53170 8.8 HIGH accel/ethosu: reject DMA commands with uninitialized length
CVE-2026-53188 8.8 HIGH RDMA/core: Validate the passed in fops for ib_get_ucaps()

Showing top 20 of 146 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53252

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