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Vulnerability record · CVE-2026-53255 · published 25 June 2026

CVE-2026-53255: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

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].

7.1 CVSS 3.1 High EPSS 0.12% · top 98.5% CWE-125 · Out-of-bounds read
7.1CVSS 3.1 base score
0.12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
8 Jul 2026Last modified by NVD

Description

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].

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/06fcbd79c3c360a50f9be9d370769bbd738d0976 Patch
https://git.kernel.org/stable/c/13ad995071a06570668dd8daab3616c247c72080 Patch
https://git.kernel.org/stable/c/18fea1cb0c2599752e908c8217490f73ddd33e00 Patch
https://git.kernel.org/stable/c/1a3c8ffbb469859b076445af44bdfa6a711d483e Patch
https://git.kernel.org/stable/c/2a3f3ed9e198ae23c15859ace2f9ca6cfdc35b57 Patch
https://git.kernel.org/stable/c/74c08e4db35a476c3462aeb65846f955be732626 Patch
https://git.kernel.org/stable/c/de23fb62259aa01d294f77238ae3b835eb674413 Patch
https://git.kernel.org/stable/c/f7093ac233c1e7f51d125534f46067772a113175 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-53255), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.