Bluetooth: MGMT: validate advertising TLV before type checks

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Summary

CVECVE-2026-53255
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:43 UTC
Updated2026-07-08 16:44:20 UTC
DescriptionIn 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].

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

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

EPSS: 0.001720000 probability, percentile 0.068020000 (date 2026-07-04)

Problem Types: CWE-125

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2bb36870e8cb29949ef9acec37129cd8e70f1857 13ad995071a06570668dd8daab3616c247c72080 git Not specified
CNA Linux Linux affected 2bb36870e8cb29949ef9acec37129cd8e70f1857 06fcbd79c3c360a50f9be9d370769bbd738d0976 git Not specified
CNA Linux Linux affected 2bb36870e8cb29949ef9acec37129cd8e70f1857 f7093ac233c1e7f51d125534f46067772a113175 git Not specified
CNA Linux Linux affected 2bb36870e8cb29949ef9acec37129cd8e70f1857 74c08e4db35a476c3462aeb65846f955be732626 git Not specified
CNA Linux Linux affected 2bb36870e8cb29949ef9acec37129cd8e70f1857 18fea1cb0c2599752e908c8217490f73ddd33e00 git Not specified
CNA Linux Linux affected 2bb36870e8cb29949ef9acec37129cd8e70f1857 1a3c8ffbb469859b076445af44bdfa6a711d483e git Not specified
CNA Linux Linux affected 2bb36870e8cb29949ef9acec37129cd8e70f1857 2a3f3ed9e198ae23c15859ace2f9ca6cfdc35b57 git Not specified
CNA Linux Linux affected 2bb36870e8cb29949ef9acec37129cd8e70f1857 de23fb62259aa01d294f77238ae3b835eb674413 git Not specified
CNA Linux Linux affected 4.9 Not specified
CNA Linux Linux unaffected 4.9 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/74c08e4db35a476c3462aeb65846f955be732626 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f7093ac233c1e7f51d125534f46067772a113175 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/13ad995071a06570668dd8daab3616c247c72080 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/18fea1cb0c2599752e908c8217490f73ddd33e00 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/de23fb62259aa01d294f77238ae3b835eb674413 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/06fcbd79c3c360a50f9be9d370769bbd738d0976 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2a3f3ed9e198ae23c15859ace2f9ca6cfdc35b57 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1a3c8ffbb469859b076445af44bdfa6a711d483e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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