GHSA-2M32-7XGM-RMJ6
Vulnerability from github – Published: 2026-04-03 18:31 – Updated: 2026-04-27 15:30In 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] [ 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---
{
"affected": [],
"aliases": [
"CVE-2026-23462"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-04-03T16:16:33Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: HIDP: Fix possible UAF\n\nThis fixes the following trace caused by not dropping l2cap_conn\nreference when user-\u003eremove callback is called:\n\n[ 97.809249] l2cap_conn_free: freeing conn ffff88810a171c00\n[ 97.809907] CPU: 1 UID: 0 PID: 1419 Comm: repro_standalon Not tainted 7.0.0-rc1-dirty #14 PREEMPT(lazy)\n[ 97.809935] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014\n[ 97.809947] Call Trace:\n[ 97.809954] \u003cTASK\u003e\n[ 97.809961] dump_stack_lvl (lib/dump_stack.c:122)\n[ 97.809990] l2cap_conn_free (net/bluetooth/l2cap_core.c:1808)\n[ 97.810017] l2cap_conn_del (./include/linux/kref.h:66 net/bluetooth/l2cap_core.c:1821 net/bluetooth/l2cap_core.c:1798)\n[ 97.810055] l2cap_disconn_cfm (net/bluetooth/l2cap_core.c:7347 (discriminator 1) net/bluetooth/l2cap_core.c:7340 (discriminator 1))\n[ 97.810086] ? __pfx_l2cap_disconn_cfm (net/bluetooth/l2cap_core.c:7341)\n[ 97.810117] hci_conn_hash_flush (./include/net/bluetooth/hci_core.h:2152 (discriminator 2) net/bluetooth/hci_conn.c:2644 (discriminator 2))\n[ 97.810148] hci_dev_close_sync (net/bluetooth/hci_sync.c:5360)\n[ 97.810180] ? __pfx_hci_dev_close_sync (net/bluetooth/hci_sync.c:5285)\n[ 97.810212] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)\n[ 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))\n[ 97.810267] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)\n[ 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)\n[ 97.810320] hci_unregister_dev (net/bluetooth/hci_core.c:504 net/bluetooth/hci_core.c:2716)\n[ 97.810346] vhci_release (drivers/bluetooth/hci_vhci.c:691)\n[ 97.810375] ? __pfx_vhci_release (drivers/bluetooth/hci_vhci.c:678)\n[ 97.810404] __fput (fs/file_table.c:470)\n[ 97.810430] task_work_run (kernel/task_work.c:235)\n[ 97.810451] ? __pfx_task_work_run (kernel/task_work.c:201)\n[ 97.810472] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)\n[ 97.810495] ? do_raw_spin_unlock (./include/asm-generic/qspinlock.h:128 (discriminator 5) kernel/locking/spinlock_debug.c:142 (discriminator 5))\n[ 97.810527] do_exit (kernel/exit.c:972)\n[ 97.810547] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)\n[ 97.810574] ? __pfx_do_exit (kernel/exit.c:897)\n[ 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))\n[ 97.810616] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)\n[ 97.810639] ? do_raw_spin_lock (kernel/locking/spinlock_debug.c:95 (discriminator 4) kernel/locking/spinlock_debug.c:118 (discriminator 4))\n[ 97.810664] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)\n[ 97.810688] ? find_held_lock (kernel/locking/lockdep.c:5350 (discriminator 1))\n[ 97.810721] do_group_exit (kernel/exit.c:1093)\n[ 97.810745] get_signal (kernel/signal.c:3007 (discriminator 1))\n[ 97.810772] ? security_file_permission (./arch/x86/include/asm/jump_label.h:37 security/security.c:2366)\n[ 97.810803] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)\n[ 97.810826] ? vfs_read (fs/read_write.c:555)\n[ 97.810854] ? __pfx_get_signal (kernel/signal.c:2800)\n[ 97.810880] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)\n[ 97.810905] ? __pfx_vfs_read (fs/read_write.c:555)\n[ 97.810932] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)\n[ 97.810960] arch_do_signal_or_restart (arch/\n---truncated---",
"id": "GHSA-2m32-7xgm-rmj6",
"modified": "2026-04-27T15:30:31Z",
"published": "2026-04-03T18:31:22Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23462"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/18b1263ece6431bd78fa6b61faaef5281203741c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/21a47a119f33df9bb157326846390d7e8e1b45ba"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/45ebe5b900200ac3e01f3470506a44a447825721"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4d37fa7582aa960ba23e10a7a2596a29f37ad281"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7c805b7d1e580eececcc92470292e3dbc42bc3f5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d955ccbf91ab74d76fe9e4eab2846a7d8a173075"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dbf666e4fc9bdd975a61bf682b3f75cb0145eedd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f8b6ed2f06d3baa44f347a0fa2af52433f386463"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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