CVE-2026-53254 - Vulnerability Details

- Bluetooth: RFCOMM: validate skb length in MCC handlers

Description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: RFCOMM: validate skb length in MCC handlers

The RFCOMM MCC handlers cast skb->data to protocol-specific structs
without validating skb->len first. A malicious remote device can send
truncated MCC frames and trigger out-of-bounds reads in these handlers.

Fix this by using skb_pull_data() to validate and access the required
data before dereferencing it.

rfcomm_recv_rpn() requires special handling since ETSI TS 07.10 allows
1-byte RPN requests. Handle this by validating only the DLCI byte first,
and validating the full struct only when len > 1.

Published: 2026-06-25

Score: 8.1 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`1da177e4c3f41524e886b7f1b8a0c1fc7321cac2`	affected	< 7c15c7c2878957cbfed93bcc29c13fdace464254
`1da177e4c3f41524e886b7f1b8a0c1fc7321cac2`	affected	< 0d637136ce89f9a2309b2c3502402ce400dab0ef
`1da177e4c3f41524e886b7f1b8a0c1fc7321cac2`	affected	< 98377e6b1a1a56561ec66a181573ea2b61b2079e
`1da177e4c3f41524e886b7f1b8a0c1fc7321cac2`	affected	< 1b070ac9e99c2c2c3a8112943ca98ab6fca7f10c
`1da177e4c3f41524e886b7f1b8a0c1fc7321cac2`	affected	< 3eabc6d47a0ad22b053329997aaf0ec1e581e392
`1da177e4c3f41524e886b7f1b8a0c1fc7321cac2`	affected	< 08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997
`1da177e4c3f41524e886b7f1b8a0c1fc7321cac2`	affected	< 23882b828c3c8c51d0c946446a396b10abb3b16b

Linux

affected

Version	Status	Constraints
`2.6.12`	affected	—
`0`	unaffected	< 2.6.12
`5.15.210`	unaffected	≤ 5.15.*
`6.1.176`	unaffected	≤ 6.1.*
`6.6.143`	unaffected	≤ 6.6.*
`6.12.94`	unaffected	≤ 6.12.*
`6.18.36`	unaffected	≤ 6.18.*
`7.0.13`	unaffected	≤ 7.0.*
`7.1`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,7c15c7c2878957cbfed93bcc29c13fdace464254)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,0d637136ce89f9a2309b2c3502402ce400dab0ef)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,98377e6b1a1a56561ec66a181573ea2b61b2079e)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,1b070ac9e99c2c2c3a8112943ca98ab6fca7f10c)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,3eabc6d47a0ad22b053329997aaf0ec1e581e392)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,23882b828c3c8c51d0c946446a396b10abb3b16b)`	affected	code_commit	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`2.6.12`	affected	semver	—
`[0,2.6.12)`	unaffected	semver	—
`[5.15.210,5.16.0)`	unaffected	semver	—
`[6.1.176,6.2.0)`	unaffected	semver	—
`[6.6.143,6.7.0)`	unaffected	semver	—
`[6.12.94,6.13.0)`	unaffected	semver	—
`[6.18.36,6.19.0)`	unaffected	semver	—
`[7.0.13,7.1.0)`	unaffected	semver	—
`[7.1,*]`	unaffected	generic	—

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Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00283.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997
https://git.kernel.org/stable/c/0d637136ce89f9a2309b2c3502402ce400dab0ef
https://git.kernel.org/stable/c/1b070ac9e99c2c2c3a8112943ca98ab6fca7f10c
https://git.kernel.org/stable/c/23882b828c3c8c51d0c946446a396b10abb3b16b
https://git.kernel.org/stable/c/3eabc6d47a0ad22b053329997aaf0ec1e581e392
https://git.kernel.org/stable/c/7c15c7c2878957cbfed93bcc29c13fdace464254
https://git.kernel.org/stable/c/98377e6b1a1a56561ec66a181573ea2b61b2079e
https://lore.kernel.org/linux-cve-announce/2026062514-CVE-2026-53254-82af@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-53254
https://www.cve.org/CVERecord?id=CVE-2026-53254

History

Sun, 28 Jun 2026 11:30:00 +0000

Type	Values Removed	Values Added
Weaknesses	CWE-119 CWE-125

Sun, 28 Jun 2026 08:00:00 +0000

Type	Values Removed	Values Added
Metrics	cvssV3_1 `{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}`	cvssV3_1 `{'score': 8.1, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'}`

Fri, 26 Jun 2026 12:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-1284
References		https://lore.kernel.org/linux-cve-announce/2026062514-CVE-2026-53254-82af@gregkh/T https://nvd.nist.gov/vuln/detail/CVE-2026-53254 https://www.cve.org/CVERecord?id=CVE-2026-53254
Metrics	threat_severity `None`	cvssV3_1 `{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}` threat_severity `Moderate`

Thu, 25 Jun 2026 12:30:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-119 CWE-125

Thu, 25 Jun 2026 09:15:00 +0000

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: validate skb length in MCC handlers The RFCOMM MCC handlers cast skb->data to protocol-specific structs without validating skb->len first. A malicious remote device can send truncated MCC frames and trigger out-of-bounds reads in these handlers. Fix this by using skb_pull_data() to validate and access the required data before dereferencing it. rfcomm_recv_rpn() requires special handling since ETSI TS 07.10 allows 1-byte RPN requests. Handle this by validating only the DLCI byte first, and validating the full struct only when len > 1.
Title		Bluetooth: RFCOMM: validate skb length in MCC handlers
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997 https://git.kernel.org/stable/c/0d637136ce89f9a2309b2c3502402ce400dab0ef https://git.kernel.org/stable/c/1b070ac9e99c2c2c3a8112943ca98ab6fca7f10c https://git.kernel.org/stable/c/23882b828c3c8c51d0c946446a396b10abb3b16b https://git.kernel.org/stable/c/3eabc6d47a0ad22b053329997aaf0ec1e581e392 https://git.kernel.org/stable/c/7c15c7c2878957cbfed93bcc29c13fdace464254 https://git.kernel.org/stable/c/98377e6b1a1a56561ec66a181573ea2b61b2079e

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-06-25T08:39:45.273Z

Updated: 2026-06-28T06:40:59.075Z

Reserved: 2026-06-09T07:44:35.394Z

Link: CVE-2026-53254

Vulnrichment

No data.

NVD

No data.

Redhat

Severity : Moderate

Publid Date: 2026-06-25T00:00:00Z

Links: CVE-2026-53254 - Bugzilla

OpenCVE Enrichment

Updated: 2026-06-28T12:45:07Z

Weaknesses

CWE-1284

Tracking

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact High

User Interaction None

Subscriptions

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