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

CVSS 8.8 · High EPSS 0.25% · P17

Affected Version Matrix 15

VendorProductVersion RangeStatus
LinuxLinux249c88e7fb45b6b705040c5af4bd0d0f2bc9735c< 64d1645f26aa49b5a86ba2fccd0bb6749ea725a6affected
227a0cdf4a028a73dc256d0f5144b4808d718893< 963fb4b8e7d1ab07b4ae45bf15d41e667c88cacaaffected
227a0cdf4a028a73dc256d0f5144b4808d718893< e8f9fef362bab431d95371d3406bc720350290c3affected
227a0cdf4a028a73dc256d0f5144b4808d718893< fa812cfa81aa3d4a7b6ce8277979af57b3f79712affected
227a0cdf4a028a73dc256d0f5144b4808d718893< 5761d003daa987ac81463f570713ce9c9dd204e5affected
58afdc9b18871eb1d461c725be9e9f3f44a39aebaffected
6.6.51< 6.6.151affected
6.10.10< 6.11affected
… +7 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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 249c88e7fb45b6b705040c5af4bd0d0f2bc9735c ~ 64d1645f26aa49b5a86ba2fccd0bb6749ea725a6 -
LinuxLinux 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 · 846 CVEs total

CVE-2026-7242110.0 CRITICALipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-7427910.0 CRITICALcrypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-7447510.0 CRITICALvxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-7428010.0 CRITICALcrypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-7430910.0 CRITICALvdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-7240810.0 CRITICALgeneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-7240710.0 CRITICALgeneve: validate inner network offset in geneve_gro_complete()
CVE-2026-724939.9 CRITICALnet: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-724369.8 CRITICALnetfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types
CVE-2026-724229.8 CRITICALksmbd: fix use-after-free of conn->preauth_info in concurrent SMB2 NEGOTIATE
CVE-2026-744339.8 CRITICALrxrpc: Fix UAF in rxgk_issue_challenge()
CVE-2026-721399.8 CRITICALtcp: defer md5sig_info kfree past RCU grace period in tcp_connect
CVE-2026-720659.8 CRITICALnet: mana: Validate the packet length reported by the NIC
CVE-2026-720649.8 CRITICALnet: mana: Sync page pool RX frags for CPU
CVE-2026-744349.8 CRITICALrxrpc: Don't move a peeked OOB message onto the pending queue
CVE-2026-722999.8 CRITICALtipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-724299.8 CRITICALipv6: ioam: fix type confusion of dst_entry
CVE-2026-724519.8 CRITICALxfrm: Fix xfrm state cache insertion race
CVE-2026-720419.8 CRITICALespintcp: use sk_msg_free_partial to fix partial send
CVE-2026-744959.8 CRITICALigbvf: Fix leak in TX DMA error cleanup

Showing top 20 of 846 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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