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CVE-2026-74531— Bluetooth: hci_conn: hold conn reference in abort_conn_sync()

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基金会开源的一个操作系统内核。 Linux kernel 6.6.51至6.6.151之前版本、6.10.10至6.11之前版本和6.11版本存在安全漏洞，该漏洞源于在abort_conn_sync()函数中未持有conn引用，可能导致释放后重用。

CVSS 8.8 · High EPSS 0.25% · P16

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 17

VendorProduct Version RangeStatus
Linux Linux 249c88e7fb45b6b705040c5af4bd0d0f2bc9735c< 64d1645f26aa49b5a86ba2fccd0bb6749ea725a6 affected
227a0cdf4a028a73dc256d0f5144b4808d718893< 963fb4b8e7d1ab07b4ae45bf15d41e667c88caca affected
227a0cdf4a028a73dc256d0f5144b4808d718893< e8f9fef362bab431d95371d3406bc720350290c3 affected
227a0cdf4a028a73dc256d0f5144b4808d718893< fa812cfa81aa3d4a7b6ce8277979af57b3f79712 affected
227a0cdf4a028a73dc256d0f5144b4808d718893< 5761d003daa987ac81463f570713ce9c9dd204e5 affected
7fe4d391e937c2f048a43ff4b421e677f10d83c0 affected
58afdc9b18871eb1d461c725be9e9f3f44a39aeb affected
6.6.51< 6.6.151 affected
… +9 more rows
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I. Basic Information for CVE-2026-74531

Vulnerability Information
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Vulnerability Title
Bluetooth: hci_conn: hold conn reference in abort_conn_sync()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: hold conn reference in abort_conn_sync() There is theoretical UAF if the conn is freed while the hci_sync task is running. Hold refcount to avoid that.
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基金会开源的一个操作系统内核。 Linux kernel 6.6.51至6.6.151之前版本、6.10.10至6.11之前版本和6.11版本存在安全漏洞，该漏洞源于在abort_conn_sync()函数中未持有conn引用，可能导致释放后重用。
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 249c88e7fb45b6b705040c5af4bd0d0f2bc9735c ~ 64d1645f26aa49b5a86ba2fccd0bb6749ea725a6 -
Linux Linux 6.11 -

II. Public POCs for CVE-2026-74531

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III. Intelligence Information for CVE-2026-74531

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Patches & Fixes for CVE-2026-74531 (5)

Same Patch Batch · Linux · 2026-08-15 · 844 CVEs total

CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72046 9.8 CRITICAL gve: fix header buffer corruption with header-split and HW-GRO
CVE-2026-74376 9.8 CRITICAL md/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-72217 9.8 CRITICAL SUNRPC: Bound-check xdr_buf_to_bvec() stores before writing
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-74384 9.8 CRITICAL nvme-multipath: fix flex array size in struct nvme_ns_head
CVE-2026-72210 9.8 CRITICAL ntfs: fix off-by-one in mapping pairs decoding bounds checks
CVE-2026-72211 9.8 CRITICAL ntfs: grow index root value before reparent header update
CVE-2026-72317 9.8 CRITICAL SUNRPC: pin upper rpc_clnt across the TLS connect_worker
CVE-2026-72209 9.8 CRITICAL ntfs: validate attribute values on lookup
CVE-2026-74267 9.8 CRITICAL net/sched: sch_codel: Do not call qdisc_tree_reduce_backlog during peek before restoring q
CVE-2026-72206 9.8 CRITICAL ntfs: validate index block header more strictly
CVE-2026-72207 9.8 CRITICAL ntfs: not change 0-byte $DATA attribute to non-resident

Showing top 20 of 844 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74531

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