CVE-2026-53255High· 7.1▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: validate advertising TLV before type checks tlv_data_is_valid() reads each advertising data field length from data[i], then inspects data[i + 1] for m…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 39.1 · likelihood 0 · exploitation 0
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Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.1%
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: MGMT: validate advertising TLV before type checks
tlv_data_is_valid() reads each advertising data field length from data[i], then inspects data[i + 1] for managed EIR types before checking that the current field still fits inside the supplied buffer.
A malformed field whose length byte is the last byte of the buffer can therefore make the parser read one byte past the advertising data.
KASAN reported the following when a malformed MGMT_OP_ADD_ADVERTISING request reached that path:
BUG: KASAN: vmalloc-out-of-bounds in tlv_data_is_valid() Read of size 1 Call trace: tlv_data_is_valid() add_advertising() hci_mgmt_cmd() hci_sock_sendmsg()
Move the existing element-length check before any type-octet inspection so each non-empty element is proven to contain its type byte before the parser looks at data[i + 1].
linux_kernel >= 4.9, < 5.10.259linux_kernel >= 5.11, < 5.15.210linux_kernel >= 5.16, < 6.1.176linux_kernel >= 6.2, < 6.6.143linux_kernel >= 6.7, < 6.12.94linux_kernel >= 6.13, < 6.18.36linux_kernel >= 6.19, < 7.0.13linux_kernel = 7.1Upgrade past the affected range:
linux_kernel 7.0.13Connected by shared product, vendor, weakness, or advisory.
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