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CVE-2026-80721— Bluetooth: ISO: ensure no dangling hcon references in iso_conn

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 6.18.44之前版本和7.1.8之前版本存在安全漏洞，该漏洞源于Bluetooth ISO子系统中iso_conn_del()函数未显式清除conn->hcon引用，可能导致悬空引用，进而引发释放后重用或空指针取消引用。

CVSS 8.8 · High EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1565 · Data Manipulation

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux dc26097bdb864a0d5955b9a25e43376ffc1af99b< e941799c31f68e67ce0976efb38a79101f921b64 affected
dc26097bdb864a0d5955b9a25e43376ffc1af99b< cdce8af9291d8a1f8916c271de029bf558d9e8ec affected
dc26097bdb864a0d5955b9a25e43376ffc1af99b< aa9f7cb2bd3a2be998ceb739fc9a2f986eba43eb affected
f53e7489273dc2bb307bf50f319b3762d45534f0 affected
a58d0f5dac322e16cc75334d000666512341bde5 affected
6.11.11< 6.12 affected
6.12.2< 6.13 affected
6.13 affected
… +4 more rows
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I. Basic Information for CVE-2026-80721

Vulnerability Information
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Vulnerability Title
Bluetooth: ISO: ensure no dangling hcon references in iso_conn
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: ensure no dangling hcon references in iso_conn After iso_conn_del(), ISO sockets should not dereference the hcon any more. Currently, clearing iso_conn::hcon relies on iso_conn_del() releasing the last reference to the iso_conn. Simplify this by explicitly clearing conn->hcon in iso_conn_del(), to avoid more complex reasoning on races about who holds the last reference.
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 6.18.44之前版本和7.1.8之前版本存在安全漏洞，该漏洞源于Bluetooth ISO子系统中iso_conn_del()函数未显式清除conn->hcon引用，可能导致悬空引用，进而引发释放后重用或空指针取消引用。
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 dc26097bdb864a0d5955b9a25e43376ffc1af99b ~ e941799c31f68e67ce0976efb38a79101f921b64 -
Linux Linux 6.13 -

II. Public POCs for CVE-2026-80721

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III. Intelligence Information for CVE-2026-80721

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Patches & Fixes for CVE-2026-80721 (3)

Same Patch Batch · Linux · 2026-08-28 · 135 CVEs total

CVE-2026-80634 9.8 CRITICAL netfilter: flowtable: avoid num_encaps underflow on bridge VLAN untag
CVE-2026-80694 9.8 CRITICAL net: ethernet: mtk_eth_soc: pass eth to mtk_handle_irq_rx in poll_controller
CVE-2026-80681 9.8 CRITICAL vxlan: re-fetch eth header after route_shortcircuit()
CVE-2026-80674 9.8 CRITICAL ntfs: validate resident attribute lists and harden the validator
CVE-2026-80673 9.8 CRITICAL ntfs: bound the look-ahead attribute-list entry in ntfs_external_attr_find()
CVE-2026-80668 9.8 CRITICAL netfilter: nf_conntrack_expect: use conntrack GC to reap expectations
CVE-2026-80630 9.8 CRITICAL net/sched: sch_fq_codel: Do not call qdisc_tree_reduce_backlog during peek before restorin
CVE-2026-80617 9.8 CRITICAL net: airoha: fix foe_check_time allocation size
CVE-2026-80612 9.8 CRITICAL net: lwtunnel: Drop skb metadata before LWT encapsulation
CVE-2026-80609 9.8 CRITICAL qede: fix out-of-bounds check for cqe->len_list[]
CVE-2026-80600 9.8 CRITICAL batman-adv: dat: acquire ARP hw source only after skb realloc
CVE-2026-80714 9.8 CRITICAL ipvs: do not propagate one-packet flag to synced conns
CVE-2026-80671 9.3 CRITICAL perf sched: Fix register_pid() overflow, strcpy, and BUG_ON
CVE-2026-80693 9.3 CRITICAL idpf: bound interrupt-vector register fill to the allocated array
CVE-2026-80684 9.3 CRITICAL KVM: s390: pci: Fix NULL dereference on AIBV allocation failure
CVE-2026-80603 9.1 CRITICAL netfilter: nf_conntrack_irc: fix parse_dcc() off-by-one OOB read
CVE-2026-80670 9.1 CRITICAL perf tools: Use perf_env__get_cpu_topology() in machine__resolve()
CVE-2026-80604 8.8 HIGH HID: core: Fix OOB read in hid_get_report for numbered reports
CVE-2026-80608 8.8 HIGH accel/amdxdna: Fix iommu domain lifetime race during device removal
CVE-2026-80683 8.8 HIGH Bluetooth: SCO: give the socket its own sco_conn reference

Showing top 20 of 135 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80721

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