CVE-2025-38593— Bluetooth: hci_sync: fix double free in 'hci_discovery_filter_clear()'
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I. Basic Information for CVE-2025-38593
Vulnerability Information
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Vulnerability Title
Bluetooth: hci_sync: fix double free in 'hci_discovery_filter_clear()'
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: fix double free in 'hci_discovery_filter_clear()' Function 'hci_discovery_filter_clear()' frees 'uuids' array and then sets it to NULL. There is a tiny chance of the following race: 'hci_cmd_sync_work()' 'update_passive_scan_sync()' 'hci_update_passive_scan_sync()' 'hci_discovery_filter_clear()' kfree(uuids); <-------------------------preempted--------------------------------> 'start_service_discovery()' 'hci_discovery_filter_clear()' kfree(uuids); // DOUBLE FREE <-------------------------preempted--------------------------------> uuids = NULL; To fix it let's add locking around 'kfree()' call and NULL pointer assignment. Otherwise the following backtrace fires: [ ] ------------[ cut here ]------------ [ ] kernel BUG at mm/slub.c:547! [ ] Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP [ ] CPU: 3 UID: 0 PID: 246 Comm: bluetoothd Tainted: G O 6.12.19-kernel #1 [ ] Tainted: [O]=OOT_MODULE [ ] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ ] pc : __slab_free+0xf8/0x348 [ ] lr : __slab_free+0x48/0x348 ... [ ] Call trace: [ ] __slab_free+0xf8/0x348 [ ] kfree+0x164/0x27c [ ] start_service_discovery+0x1d0/0x2c0 [ ] hci_sock_sendmsg+0x518/0x924 [ ] __sock_sendmsg+0x54/0x60 [ ] sock_write_iter+0x98/0xf8 [ ] do_iter_readv_writev+0xe4/0x1c8 [ ] vfs_writev+0x128/0x2b0 [ ] do_writev+0xfc/0x118 [ ] __arm64_sys_writev+0x20/0x2c [ ] invoke_syscall+0x68/0xf0 [ ] el0_svc_common.constprop.0+0x40/0xe0 [ ] do_el0_svc+0x1c/0x28 [ ] el0_svc+0x30/0xd0 [ ] el0t_64_sync_handler+0x100/0x12c [ ] el0t_64_sync+0x194/0x198 [ ] Code: 8b0002e6 eb17031f 54fffbe1 d503201f (d4210000) [ ] ---[ end trace 0000000000000000 ]---
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
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Bluetooth: hci_sync模块在hci_discovery_filter_clear函数中可能导致双重释放。
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-2025-38593
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Same Patch Batch · Linux · 2025-08-19 · 60 CVEs total
| CVE-2025-38594 | iommu/vt-d: Fix UAF on sva unbind with pending IOPFs | |
| CVE-2025-38614 | eventpoll: Fix semi-unbounded recursion | |
| CVE-2025-38610 | powercap: dtpm_cpu: Fix NULL pointer dereference in get_pd_power_uw() | |
| CVE-2025-38609 | PM / devfreq: Check governor before using governor->name | |
| CVE-2025-38608 | bpf, ktls: Fix data corruption when using bpf_msg_pop_data() in ktls | |
| CVE-2025-38612 | staging: fbtft: fix potential memory leak in fbtft_framebuffer_alloc() | |
| CVE-2025-38598 | drm/amdgpu: fix use-after-free in amdgpu_userq_suspend+0x51a/0x5a0 | |
| CVE-2025-38597 | drm/rockchip: vop2: fail cleanly if missing a primary plane for a video-port | |
| CVE-2025-38595 | xen: fix UAF in dmabuf_exp_from_pages() | |
| CVE-2025-38596 | drm/panthor: Fix UAF in panthor_gem_create_with_handle() debugfs code | |
| CVE-2025-38599 | wifi: mt76: mt7996: Fix possible OOB access in mt7996_tx() | |
| CVE-2025-38592 | Bluetooth: hci_devcd_dump: fix out-of-bounds via dev_coredumpv | |
| CVE-2025-38591 | bpf: Reject narrower access to pointer ctx fields | |
| CVE-2025-38590 | net/mlx5e: Remove skb secpath if xfrm state is not found | |
| CVE-2025-38589 | neighbour: Fix null-ptr-deref in neigh_flush_dev(). | |
| CVE-2025-38588 | ipv6: prevent infinite loop in rt6_nlmsg_size() | |
| CVE-2025-38587 | ipv6: fix possible infinite loop in fib6_info_uses_dev() | |
| CVE-2025-38586 | bpf, arm64: Fix fp initialization for exception boundary | |
| CVE-2025-38585 | staging: media: atomisp: Fix stack buffer overflow in gmin_get_var_int() | |
| CVE-2025-38584 | padata: Fix pd UAF once and for all |
Showing top 20 of 60 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
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scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2025-38593
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