Bluetooth: Serialize SMP remote OOB data access

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98738
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:27 UTC
Updated2026-10-21 13:21:41 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 02b05bd8b0a632e9a26795bced8f19ca6a5f7079 94afa17d6bfd5c1d367c56c8b63df5f695380861 git Not specified
CNA Linux Linux affected 02b05bd8b0a632e9a26795bced8f19ca6a5f7079 1e11412a1b9854a89d044576d616675b16141d87 git Not specified
CNA Linux Linux affected 02b05bd8b0a632e9a26795bced8f19ca6a5f7079 889c61e3d0f1091a958e4b2a24b20bab23d915c4 git Not specified
CNA Linux Linux affected 02b05bd8b0a632e9a26795bced8f19ca6a5f7079 df5162eeb10e69fe0c2349503882c4a09077f001 git Not specified
CNA Linux Linux affected 02b05bd8b0a632e9a26795bced8f19ca6a5f7079 81a2345f1984f0b36d3226571bc196316a01b648 git Not specified
CNA Linux Linux affected 3.19 Not specified
CNA Linux Linux unaffected 3.19 semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/889c61e3d0f1091a958e4b2a24b20bab23d915c4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/df5162eeb10e69fe0c2349503882c4a09077f001 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/81a2345f1984f0b36d3226571bc196316a01b648 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1e11412a1b9854a89d044576d616675b16141d87 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/94afa17d6bfd5c1d367c56c8b63df5f695380861 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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