CVE-2026-98738Medium· 5.1▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: Serialize SMP remote OOB data access build_pairing_cmd() looks up remote OOB data and copies its contents without holding hdev->lock, which serializes the l…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 28.1 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Oct 20.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
Last analysed / modified upstream
— → 5.1
none → medium
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: Serialize SMP remote OOB data access
build_pairing_cmd() looks up remote OOB data and copies its contents without holding hdev->lock, which serializes the list's writers. After SMP finds an entry, a concurrent management Remove Remote OOB Data command can unlink and free it before SMP reads its present flag or copies its random and confirmation values. Removal can also invalidate an entry while the lookup is still traversing the list.
KASAN reported:
BUG: KASAN: slab-use-after-free in build_pairing_cmd+0x948/0x9b0 Call Trace: build_pairing_cmd+0x948/0x9b0 smp_recv_cb+0x459f/0x8110 l2cap_recv_frame+0xf14/0x9190 l2cap_recv_acldata+0xa64/0xd40 hci_rx_work+0x4ca/0x730
Allocated by task 87: hci_add_remote_oob_data+0x11d/0x530 add_remote_oob_data+0x282/0x400 hci_sock_sendmsg+0x1033/0x1ea0
Freed by task 93: hci_remote_oob_data_clear+0x108/0x1c0 remove_remote_oob_data+0x198/0x220 hci_sock_sendmsg+0x1033/0x1ea0
Taking hdev->lock in build_pairing_cmd() would recurse for callers that already hold it and invert the device-to-L2CAP lock order on the receive path. Add a per-device remote_oob_lock instead, held across the SMP lookup and copies and by the add, remove and clear helpers. Cover initialization and in-place updates as well, so SMP cannot read partially initialized or updated OOB values. Release the mutex on allocation failure, preserving the existing error return.
The new critical sections acquire no device, connection or channel locks. Writers retain their existing hdev->lock protection, which continues to serialize the other readers without changing their locking or behavior.
Linux >= 02b05bd8b0a632e9a26795bced8f19ca6a5f7079 < 94afa17d6bfd5c1d367c56c8b63df5f695380861Linux >= 02b05bd8b0a632e9a26795bced8f19ca6a5f7079 < 1e11412a1b9854a89d044576d616675b16141d87Linux >= 02b05bd8b0a632e9a26795bced8f19ca6a5f7079 < 889c61e3d0f1091a958e4b2a24b20bab23d915c4Linux >= 02b05bd8b0a632e9a26795bced8f19ca6a5f7079 < df5162eeb10e69fe0c2349503882c4a09077f001Linux >= 02b05bd8b0a632e9a26795bced8f19ca6a5f7079 < 81a2345f1984f0b36d3226571bc196316a01b648Linux 3.19Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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