CVE-2026-23462— Bluetooth: HIDP: Fix possible UAF
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，该漏洞源于未正确释放引用，可能导致释放后重用。
Possible ATT&CK Techniques 2 AI
T1211 · Exploitation for Stealth T1059 · Command and Scripting InterpreterAffected Version Matrix 18
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | b4f34d8d9d26b2428fa7cf7c8f97690a297978e6< d955ccbf91ab74d76fe9e4eab2846a7d8a173075 |
affected |
b4f34d8d9d26b2428fa7cf7c8f97690a297978e6< 18b1263ece6431bd78fa6b61faaef5281203741c |
affected | ||
b4f34d8d9d26b2428fa7cf7c8f97690a297978e6< 21a47a119f33df9bb157326846390d7e8e1b45ba |
affected | ||
b4f34d8d9d26b2428fa7cf7c8f97690a297978e6< 45ebe5b900200ac3e01f3470506a44a447825721 |
affected | ||
b4f34d8d9d26b2428fa7cf7c8f97690a297978e6< 7c805b7d1e580eececcc92470292e3dbc42bc3f5 |
affected | ||
b4f34d8d9d26b2428fa7cf7c8f97690a297978e6< f8b6ed2f06d3baa44f347a0fa2af52433f386463 |
affected | ||
b4f34d8d9d26b2428fa7cf7c8f97690a297978e6< 4d37fa7582aa960ba23e10a7a2596a29f37ad281 |
affected | ||
b4f34d8d9d26b2428fa7cf7c8f97690a297978e6< dbf666e4fc9bdd975a61bf682b3f75cb0145eedd |
affected | ||
| … +10 more rows | |||
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I. Basic Information for CVE-2026-23462
Vulnerability Information
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Vulnerability Title
Bluetooth: HIDP: Fix possible UAF
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: HIDP: Fix possible UAF
This fixes the following trace caused by not dropping l2cap_conn
reference when user->remove callback is called:
[ 97.809249] l2cap_conn_free: freeing conn ffff88810a171c00
[ 97.809907] CPU: 1 UID: 0 PID: 1419 Comm: repro_standalon Not tainted 7.0.0-rc1-dirty #14 PREEMPT(lazy)
[ 97.809935] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014
[ 97.809947] Call Trace:
[ 97.809954] <TASK>
[ 97.809961] dump_stack_lvl (lib/dump_stack.c:122)
[ 97.809990] l2cap_conn_free (net/bluetooth/l2cap_core.c:1808)
[ 97.810017] l2cap_conn_del (./include/linux/kref.h:66 net/bluetooth/l2cap_core.c:1821 net/bluetooth/l2cap_core.c:1798)
[ 97.810055] l2cap_disconn_cfm (net/bluetooth/l2cap_core.c:7347 (discriminator 1) net/bluetooth/l2cap_core.c:7340 (discriminator 1))
[ 97.810086] ? __pfx_l2cap_disconn_cfm (net/bluetooth/l2cap_core.c:7341)
[ 97.810117] hci_conn_hash_flush (./include/net/bluetooth/hci_core.h:2152 (discriminator 2) net/bluetooth/hci_conn.c:2644 (discriminator 2))
[ 97.810148] hci_dev_close_sync (net/bluetooth/hci_sync.c:5360)
[ 97.810180] ? __pfx_hci_dev_close_sync (net/bluetooth/hci_sync.c:5285)
[ 97.810212] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[ 97.810242] ? up_write (./arch/x86/include/asm/atomic64_64.h:87 (discriminator 5) ./include/linux/atomic/atomic-arch-fallback.h:2852 (discriminator 5) ./include/linux/atomic/atomic-long.h:268 (discriminator 5) ./include/linux/atomic/atomic-instrumented.h:3391 (discriminator 5) kernel/locking/rwsem.c:1385 (discriminator 5) kernel/locking/rwsem.c:1643 (discriminator 5))
[ 97.810267] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[ 97.810290] ? rcu_is_watching (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/context_tracking.h:128 kernel/rcu/tree.c:752)
[ 97.810320] hci_unregister_dev (net/bluetooth/hci_core.c:504 net/bluetooth/hci_core.c:2716)
[ 97.810346] vhci_release (drivers/bluetooth/hci_vhci.c:691)
[ 97.810375] ? __pfx_vhci_release (drivers/bluetooth/hci_vhci.c:678)
[ 97.810404] __fput (fs/file_table.c:470)
[ 97.810430] task_work_run (kernel/task_work.c:235)
[ 97.810451] ? __pfx_task_work_run (kernel/task_work.c:201)
[ 97.810472] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[ 97.810495] ? do_raw_spin_unlock (./include/asm-generic/qspinlock.h:128 (discriminator 5) kernel/locking/spinlock_debug.c:142 (discriminator 5))
[ 97.810527] do_exit (kernel/exit.c:972)
[ 97.810547] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[ 97.810574] ? __pfx_do_exit (kernel/exit.c:897)
[ 97.810594] ? lock_acquire (kernel/locking/lockdep.c:470 (discriminator 6) kernel/locking/lockdep.c:5870 (discriminator 6) kernel/locking/lockdep.c:5825 (discriminator 6))
[ 97.810616] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[ 97.810639] ? do_raw_spin_lock (kernel/locking/spinlock_debug.c:95 (discriminator 4) kernel/locking/spinlock_debug.c:118 (discriminator 4))
[ 97.810664] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[ 97.810688] ? find_held_lock (kernel/locking/lockdep.c:5350 (discriminator 1))
[ 97.810721] do_group_exit (kernel/exit.c:1093)
[ 97.810745] get_signal (kernel/signal.c:3007 (discriminator 1))
[ 97.810772] ? security_file_permission (./arch/x86/include/asm/jump_label.h:37 security/security.c:2366)
[ 97.810803] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[ 97.810826] ? vfs_read (fs/read_write.c:555)
[ 97.810854] ? __pfx_get_signal (kernel/signal.c:2800)
[ 97.810880] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[ 97.810905] ? __pfx_vfs_read (fs/read_write.c:555)
[ 97.810932] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)
[ 97.810960] arch_do_signal_or_restart (arch/
---truncated---
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，该漏洞源于未正确释放引用，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
II. Public POCs for CVE-2026-23462
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Same Patch Batch · Linux · 2026-04-03 · 71 CVEs total
| CVE-2026-31402 | 9.8 CRITICAL | nfsd: fix heap overflow in NFSv4.0 LOCK replay cache |
| CVE-2026-23450 | 9.8 CRITICAL | net/smc: fix NULL dereference and UAF in smc_tcp_syn_recv_sock() |
| CVE-2026-23427 | 9.8 CRITICAL | ksmbd: fix use-after-free in durable v2 replay of active file handles |
| CVE-2026-23428 | 9.8 CRITICAL | ksmbd: fix use-after-free of share_conf in compound request |
| CVE-2026-23455 | 9.1 CRITICAL | netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() |
| CVE-2026-23425 | 8.8 HIGH | KVM: arm64: Fix ID register initialization for non-protected pKVM guests |
| CVE-2026-23461 | 8.8 HIGH | Bluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user |
| CVE-2026-23457 | 8.6 HIGH | netfilter: nf_conntrack_sip: fix Content-Length u32 truncation in sip_help_tcp() |
| CVE-2026-23459 | 8.2 HIGH | ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS |
| CVE-2026-23456 | 8.2 HIGH | netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case |
| CVE-2026-31393 | 8.1 HIGH | Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access |
| CVE-2026-31392 | 8.1 HIGH | smb: client: fix krb5 mount with username option |
| CVE-2026-23466 | 7.8 HIGH | drm/xe: Open-code GGTT MMIO access protection |
| CVE-2026-23432 | 7.8 HIGH | mshv: Fix use-after-free in mshv_map_user_memory error path |
| CVE-2026-31398 | 7.8 HIGH | mm/rmap: fix incorrect pte restoration for lazyfree folios |
| CVE-2026-23458 | 7.8 HIGH | netfilter: ctnetlink: fix use-after-free in ctnetlink_dump_exp_ct() |
| CVE-2026-23437 | 7.8 HIGH | net: shaper: protect late read accesses to the hierarchy |
| CVE-2026-23444 | 7.8 HIGH | wifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure |
| CVE-2026-23449 | 7.8 HIGH | net/sched: teql: Fix double-free in teql_master_xmit |
| CVE-2026-23445 | 7.8 HIGH | igc: fix page fault in XDP TX timestamps handling |
Showing top 20 of 71 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-98868
dm-pcache: reject a kset that overruns its segment -
CVE-2026-98867
dm-pcache: bound the logical key offset from persistent memo -
CVE-2026-98866
sched/cache: Introduce task_struct->sched_cache_grp to fix U -
CVE-2026-98865
sched_ext: Don't run ops.dequeue() with a DSQ lock held -
CVE-2026-98864
sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing
Same vendor: Linux
-
CVE-2026-98868
dm-pcache: reject a kset that overruns its segment -
CVE-2026-98867
dm-pcache: bound the logical key offset from persistent memo -
CVE-2026-98866
sched/cache: Introduce task_struct->sched_cache_grp to fix U -
CVE-2026-98865
sched_ext: Don't run ops.dequeue() with a DSQ lock held -
CVE-2026-98864
sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing
V. Comments for CVE-2026-23462
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