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Linux Kernel EUVDEUVD-2026-39205

| CVE-2026-53254 HIGH
Out-of-bounds Read (CWE-125)
2026-06-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67 GHSA-v722-58f9-vcj4
Buffer Overflow Information Disclosure Linux Red Hat Suse
8.1
CVSS 3.1 · Vendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Severity by source

Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67) PRIMARY
8.1 HIGH
AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
vuln.today AI
8.1 HIGH

Bluetooth proximity gives AV:A; no auth or interaction once in range (PR:N/UI:N/AC:L); out-of-bounds read yields memory disclosure (C:H) and crash (A:H), no write (I:N).

3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
4.0 AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
6.5 MEDIUM
AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Red Hat
7.0 MEDIUM
qualitative

Primary rating from Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67).

CVSS VectorVendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

Lifecycle Timeline

5
Analysis Generated
Jun 28, 2026 - 09:45 vuln.today
CVSS changed
Jun 28, 2026 - 08:22 NVD
8.1 (HIGH)
Patch available
Jun 25, 2026 - 10:32 EUVD
CVE Published
Jun 25, 2026 - 09:16 cve.org
HIGH 8.1
CVE Published
Jun 25, 2026 - 09:16 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

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.

AnalysisAI

Out-of-bounds read in the Linux kernel's Bluetooth RFCOMM stack allows a malicious paired or in-range remote device to leak adjacent kernel memory or crash the host by sending truncated MCC (Multiplexer Control Channel) frames. The RFCOMM MCC handlers cast skb->data to protocol structs without first checking skb->len, so short frames cause reads past the buffer; impact is confidentiality and availability loss (CVSS 8.1). There is no public exploit identified at time of analysis and EPSS estimates exploitation probability at just 0.18%.

Technical ContextAI

The flaw lives in net/bluetooth/rfcomm, the kernel implementation of the RFCOMM serial-port-emulation protocol over Bluetooth L2CAP, governed by ETSI TS 07.10. Within RFCOMM, the Multiplexer Control Channel (MCC) carries link-management commands (e.g. PN, RPN, MSC). The handlers received a socket buffer (skb) and directly cast skb->data to fixed-size, command-specific C structs while dereferencing fields, without validating that skb->len actually covers the struct. A truncated frame therefore drives reads beyond the allocated skb, the classic CWE-125 out-of-bounds read root cause (the input tags label it 'Buffer Overflow', though it is specifically an over-read, not an over-write). The fix replaces the unchecked cast with skb_pull_data(), which validates and advances the buffer before access; rfcomm_recv_rpn() gets special handling because ETSI TS 07.10 permits 1-byte RPN requests, so only the DLCI byte is validated first and the full struct is validated only when len > 1.

RemediationAI

Vendor-released patch: upgrade to a fixed stable kernel - 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13, or 7.1 or later as appropriate for your series, or your distribution's equivalent backport. Apply the upstream commits referenced at https://git.kernel.org/stable/ (e.g. .../c/08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997) if you maintain a custom kernel. Where patching cannot be done immediately, the most effective compensating control is to remove or disable the attack surface: unload the rfcomm module (rmmod rfcomm and blacklist it) on systems that do not need serial-port emulation, which fully removes the vulnerable path with no impact to most modern Bluetooth use (audio/HID/BLE do not require RFCOMM); alternatively disable Bluetooth entirely (rfkill block bluetooth / disable the controller) where it is unused, at the cost of losing all Bluetooth functionality. Reducing exposure by keeping devices non-discoverable and out of untrusted radio environments lowers but does not eliminate risk, since an in-range attacker can still target a known address.

Same weakness CWE-125 – Out-of-bounds Read

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
Image SLES15-SP7-Azure-3P Image SLES15-SP7-Azure-Basic Image SLES15-SP7-Azure-Standard Image SLES15-SP7-HPC-Azure Affected
Image SLES15-SP7-BYOS-Azure Image SLES15-SP7-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-Aliyun Image SLES15-SP7-CHOST-BYOS-Azure Image SLES15-SP7-CHOST-BYOS-EC2 Image SLES15-SP7-CHOST-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-GDC Image SLES15-SP7-CHOST-BYOS-SAP-CCloud Image SLES15-SP7-EC2 Image SLES15-SP7-EC2-ECS-HVM Image SLES15-SP7-GCE Image SLES15-SP7-HPC-BYOS-Azure Image SLES15-SP7-HPC-BYOS-EC2 Image SLES15-SP7-HPC-BYOS-GCE Image SLES15-SP7-Hardened-BYOS-Azure Image SLES15-SP7-Hardened-BYOS-EC2 Image SLES15-SP7-Hardened-BYOS-GCE Image SLES15-SP7-SAPCAL-Azure Image SLES15-SP7-SAPCAL-EC2 Image SLES15-SP7-SAPCAL-GCE Affected
Image SLES15-SP7-SAP-Azure Image SLES15-SP7-SAP-Azure-3P Image SLES15-SP7-SAP-BYOS-Azure Image SLES15-SP7-SAP-BYOS-EC2 Image SLES15-SP7-SAP-BYOS-GCE Image SLES15-SP7-SAP-EC2 Image SLES15-SP7-SAP-GCE Image SLES15-SP7-SAP-Hardened-Azure Image SLES15-SP7-SAP-Hardened-BYOS-Azure Image SLES15-SP7-SAP-Hardened-BYOS-EC2 Image SLES15-SP7-SAP-Hardened-BYOS-GCE Image SLES15-SP7-SAP-Hardened-GCE Affected
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed

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EUVD-2026-39205 vulnerability details – vuln.today
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