VulnerabilityPublished 25 Jun 2026Updated 6 Nov 2026

CVE-2026-53255: Linux kernel · Bluetooth: MGMT: validate advertising TLV before type checks

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f7093ac233c1e7f51d125534f46067772a113175 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:49 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in f7093ac233c1e7f51d125534f46067772a113175, de23fb62259aa01d294f77238ae3b835eb674413, 74c08e4db35a476c3462aeb65846f955be732626 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 2bb36870e8cb29949ef9acec37129cd8e70f1857, < f7093ac233c1e7f51d125534f46067772a113175	Fixed in f7093ac233c1e7f51d125534f46067772a113175
LinuxLinux	Affected ≥ 2bb36870e8cb29949ef9acec37129cd8e70f1857, < de23fb62259aa01d294f77238ae3b835eb674413	Fixed in de23fb62259aa01d294f77238ae3b835eb674413
LinuxLinux	Affected ≥ 2bb36870e8cb29949ef9acec37129cd8e70f1857, < 74c08e4db35a476c3462aeb65846f955be732626	Fixed in 74c08e4db35a476c3462aeb65846f955be732626
LinuxLinux	Affected ≥ 2bb36870e8cb29949ef9acec37129cd8e70f1857, < 18fea1cb0c2599752e908c8217490f73ddd33e00	Fixed in 18fea1cb0c2599752e908c8217490f73ddd33e00
LinuxLinux	Affected ≥ 2bb36870e8cb29949ef9acec37129cd8e70f1857, < 13ad995071a06570668dd8daab3616c247c72080	Fixed in 13ad995071a06570668dd8daab3616c247c72080
LinuxLinux	Affected ≥ 2bb36870e8cb29949ef9acec37129cd8e70f1857, < 06fcbd79c3c360a50f9be9d370769bbd738d0976	Fixed in 06fcbd79c3c360a50f9be9d370769bbd738d0976

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].

References

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