{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-23462", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:46.021Z", "datePublished": "2026-04-03T15:15:41.718Z", "dateUpdated": "2026-08-05T12:22:00.540Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:22:00.540Z" }, "descriptions": [ { "lang": "en", "value": "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->remove 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] \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---" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - The vulnerable teardown is reachable through Bluetooth HIDP over L2CAP/HCI, so an attacker must be within Bluetooth radio range rather than on an IP network.\nAC:L - After a HIDP session exists, tearing down the Bluetooth connection drives the UAF path through L2CAP removal and the HIDP kthread cleanup without requiring conditions outside attacker influence.\nPR:N - Although local HIDPCONNADD setup is gated by CAP_NET_ADMIN, a malicious adjacent Bluetooth HID peer can trigger the disconnect/removal path after a legitimate session exists without target-system privileges.\nUI:N - In the highest reasonable scenario, an already paired/connected or auto-reconnected malicious HID device can trigger the teardown without additional victim action.\nS:U - The impact remains within the Linux kernel security authority and does not cross a virtualization, IOMMU, or separate security-scope boundary.\nC:H - This is a kernel use-after-free of an L2CAP connection object, and per kernel CVSS guidance UAFs are treated as capable of enabling high-impact information disclosure.\nI:H - The stale pointer is used in mutex/list cleanup paths on freed kernel memory, making this memory corruption potentially usable for control-flow or kernel data modification.\nA:H - The reported trace shows a KASAN use-after-free and kernel crash-class behavior during HIDP/L2CAP teardown, so availability impact is high." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/hidp/core.c" ], "versions": [ { "version": "b4f34d8d9d26b2428fa7cf7c8f97690a297978e6", "lessThan": "d955ccbf91ab74d76fe9e4eab2846a7d8a173075", "status": "affected", "versionType": "git" }, { "version": "b4f34d8d9d26b2428fa7cf7c8f97690a297978e6", "lessThan": "18b1263ece6431bd78fa6b61faaef5281203741c", "status": "affected", "versionType": "git" }, { "version": "b4f34d8d9d26b2428fa7cf7c8f97690a297978e6", "lessThan": "21a47a119f33df9bb157326846390d7e8e1b45ba", "status": "affected", "versionType": "git" }, { "version": "b4f34d8d9d26b2428fa7cf7c8f97690a297978e6", "lessThan": "45ebe5b900200ac3e01f3470506a44a447825721", "status": "affected", "versionType": "git" }, { "version": "b4f34d8d9d26b2428fa7cf7c8f97690a297978e6", "lessThan": "7c805b7d1e580eececcc92470292e3dbc42bc3f5", "status": "affected", "versionType": "git" }, { "version": "b4f34d8d9d26b2428fa7cf7c8f97690a297978e6", "lessThan": "f8b6ed2f06d3baa44f347a0fa2af52433f386463", "status": "affected", "versionType": "git" }, { "version": "b4f34d8d9d26b2428fa7cf7c8f97690a297978e6", "lessThan": "4d37fa7582aa960ba23e10a7a2596a29f37ad281", "status": "affected", "versionType": "git" }, { "version": "b4f34d8d9d26b2428fa7cf7c8f97690a297978e6", "lessThan": "dbf666e4fc9bdd975a61bf682b3f75cb0145eedd", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/hidp/core.c" ], "versions": [ { "version": "3.10", "status": "affected" }, { "version": "0", "lessThan": "3.10", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.20", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.10", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "5.10.253" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "5.15.203" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.1.167" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.6.130" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.12.78" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.18.20" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.19.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d955ccbf91ab74d76fe9e4eab2846a7d8a173075" }, { "url": "https://git.kernel.org/stable/c/18b1263ece6431bd78fa6b61faaef5281203741c" }, { "url": "https://git.kernel.org/stable/c/21a47a119f33df9bb157326846390d7e8e1b45ba" }, { "url": "https://git.kernel.org/stable/c/45ebe5b900200ac3e01f3470506a44a447825721" }, { "url": "https://git.kernel.org/stable/c/7c805b7d1e580eececcc92470292e3dbc42bc3f5" }, { "url": "https://git.kernel.org/stable/c/f8b6ed2f06d3baa44f347a0fa2af52433f386463" }, { "url": "https://git.kernel.org/stable/c/4d37fa7582aa960ba23e10a7a2596a29f37ad281" }, { "url": "https://git.kernel.org/stable/c/dbf666e4fc9bdd975a61bf682b3f75cb0145eedd" } ], "title": "Bluetooth: HIDP: Fix possible UAF", "x_generator": { "engine": "bippy-1.2.0" } } } }