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CVE-2026-23461— Bluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user

CVSS 8.8 · High EPSS 0.04% · P12
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I. Basic Information for CVE-2026-23461

Vulnerability Information
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Vulnerability Title
Bluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user After commit ab4eedb790ca ("Bluetooth: L2CAP: Fix corrupted list in hci_chan_del"), l2cap_conn_del() uses conn->lock to protect access to conn->users. However, l2cap_register_user() and l2cap_unregister_user() don't use conn->lock, creating a race condition where these functions can access conn->users and conn->hchan concurrently with l2cap_conn_del(). This can lead to use-after-free and list corruption bugs, as reported by syzbot. Fix this by changing l2cap_register_user() and l2cap_unregister_user() to use conn->lock instead of hci_dev_lock(), ensuring consistent locking for the l2cap_conn structure.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于l2cap_unregister_user函数存在释放后重用，可能导致列表损坏。
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 efc30877bd4bc85fefe98d80af60fafc86e5775e ~ 11a87dd5df428a4b79a84d2790cac7f3c73f1f0d -
LinuxLinux 6.14 -

II. Public POCs for CVE-2026-23461

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III. Intelligence Information for CVE-2026-23461

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Same Patch Batch · Linux · 2026-04-03 · 72 CVEs total

CVE-2026-314029.8 CRITICALnfsd: fix heap overflow in NFSv4.0 LOCK replay cache
CVE-2026-234509.8 CRITICALnet/smc: fix NULL dereference and UAF in smc_tcp_syn_recv_sock()
CVE-2026-234279.8 CRITICALksmbd: fix use-after-free in durable v2 replay of active file handles
CVE-2026-234289.8 CRITICALksmbd: fix use-after-free of share_conf in compound request
CVE-2026-234559.1 CRITICALnetfilter: nf_conntrack_h323: check for zero length in DecodeQ931()
CVE-2026-234628.8 HIGHBluetooth: HIDP: Fix possible UAF
CVE-2026-234258.8 HIGHKVM: arm64: Fix ID register initialization for non-protected pKVM guests
CVE-2026-234578.6 HIGHnetfilter: nf_conntrack_sip: fix Content-Length u32 truncation in sip_help_tcp()
CVE-2026-234568.2 HIGHnetfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case
CVE-2026-234598.2 HIGHip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS
CVE-2026-313938.1 HIGHBluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access
CVE-2026-313928.1 HIGHsmb: client: fix krb5 mount with username option
CVE-2026-313987.8 HIGHmm/rmap: fix incorrect pte restoration for lazyfree folios
CVE-2026-234327.8 HIGHmshv: Fix use-after-free in mshv_map_user_memory error path
CVE-2026-314037.8 HIGHNFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd
CVE-2026-234377.8 HIGHnet: shaper: protect late read accesses to the hierarchy
CVE-2026-234587.8 HIGHnetfilter: ctnetlink: fix use-after-free in ctnetlink_dump_exp_ct()
CVE-2026-234447.8 HIGHwifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure
CVE-2026-234457.8 HIGHigc: fix page fault in XDP TX timestamps handling
CVE-2026-234497.8 HIGHnet/sched: teql: Fix double-free in teql_master_xmit

Showing top 20 of 72 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23461

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