Bluetooth: btusb: validate Realtek vendor event length

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Summary

CVECVE-2026-68339
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:24 UTC
Updated2026-08-10 13:20:24 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: btusb: validate Realtek vendor event length btusb_recv_event_realtek() reads the event code at data[0] and the Realtek subevent code at data[2] before deciding whether to consume a vendor event as a coredump. For example, the two-byte event ff 00 contains a complete vendor-event header declaring zero parameters. The old classifier still reads a nonexistent third byte and can misclassify the event as a coredump if the adjacent byte is 0x34. Require the HCI event header and first parameter to be present before inspecting the Realtek subevent code. Short events continue through the normal HCI receive path, which owns their protocol validation.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 044014ce85a17c0b7fab8e5df0925792010c29b2 8de58bfa26e028f99271dde5a92107cd07f5e063 git Not specified
CNA Linux Linux affected 044014ce85a17c0b7fab8e5df0925792010c29b2 400267bab0f4076088e163e58cad2bb41c3cf5e7 git Not specified
CNA Linux Linux affected 044014ce85a17c0b7fab8e5df0925792010c29b2 8881daaafadbe7fb2b7341d16a3949114409c90c git Not specified
CNA Linux Linux affected 044014ce85a17c0b7fab8e5df0925792010c29b2 24b0758193d70da47ef8b979153d2a181dbdf34e git Not specified
CNA Linux Linux affected 044014ce85a17c0b7fab8e5df0925792010c29b2 df541cd485ff80a5ddc579d99687bc7506df9851 git Not specified
CNA Linux Linux affected 6.6 Not specified
CNA Linux Linux unaffected 6.6 semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8de58bfa26e028f99271dde5a92107cd07f5e063 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/df541cd485ff80a5ddc579d99687bc7506df9851 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8881daaafadbe7fb2b7341d16a3949114409c90c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/400267bab0f4076088e163e58cad2bb41c3cf5e7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/24b0758193d70da47ef8b979153d2a181dbdf34e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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