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NVD / CVE Program· CNA Linux

CVE-2026-53254: Bluetooth: RFCOMM: validate skb length in MCC handlers

Noroxi assessment

Priority: Monitor (action score 32/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.27% (FIRST EPSS).
  • Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997, 0d637136ce89f9a2309b2c3502402ce400dab0ef, 1b070ac9e99c2c2c3a8112943ca98ab6fca7f10c; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1.

Low priority for now. Upgrade to Linux Linux 08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997, 0d637136ce89f9a2309b2c3502402ce400dab0ef, 1b070ac9e99c2c2c3a8112943ca98ab6fca7f10c; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 8.1 · v3.1—No exploit Fix available
Published
Jun 25, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 20th percentile

Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
32 / 40 · 8.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
8.1
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel2.6.12.1 and later · before 5.15.210
  • linux linux kernel5.16 and later · before 6.1.176
  • linux linux kernel6.2 and later · before 6.6.143
  • linux linux kernel6.7 and later · before 6.12.94
  • linux linux kernel6.13 and later · before 6.18.36
  • linux linux kernel6.19 and later · before 7.0.13
  • linux linux kernel2.6.12
  • linux linux kernel7.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 7c15c7c2878957cbfed93bcc29c13fdace464254affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 0d637136ce89f9a2309b2c3502402ce400dab0efaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 98377e6b1a1a56561ec66a181573ea2b61b2079eaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 1b070ac9e99c2c2c3a8112943ca98ab6fca7f10caffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 3eabc6d47a0ad22b053329997aaf0ec1e581e392affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 23882b828c3c8c51d0c946446a396b10abb3b16baffected · git
    • before 2.6.12not affected · semver
    • 5.15.210 and later · up to and including 5.15.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.53.1.el10_26.12.0-211.53.1.el10_2

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-53252Jun 25, 2026 · Bluetooth: fix memory leak in error path of hci_alloc_dev()
    22Monitor
  • ← EarlierCVE-2026-53253Jun 25, 2026 · Bluetooth: bnep: reject short frames before parsing
    28Monitor
  • Later →CVE-2026-53255Jun 25, 2026 · Bluetooth: MGMT: validate advertising TLV before type checks
    28Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997Vendor (CNA)
Linux Linux0d637136ce89f9a2309b2c3502402ce400dab0efVendor (CNA)
Linux Linux1b070ac9e99c2c2c3a8112943ca98ab6fca7f10cVendor (CNA)
Linux Linux23882b828c3c8c51d0c946446a396b10abb3b16bVendor (CNA)
Linux Linux3eabc6d47a0ad22b053329997aaf0ec1e581e392Vendor (CNA)
Linux Linux7c15c7c2878957cbfed93bcc29c13fdace464254Vendor (CNA)
Linux Linux98377e6b1a1a56561ec66a181573ea2b61b2079eVendor (CNA)
azl3 kernel 6.6.141.1-1 on Azure Linux 3.06.6.143.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:kernel6.12.0-211.53.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k6.12.0-211.53.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-core6.12.0-211.53.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug6.12.0-211.53.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-core6.12.0-211.53.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel6.12.0-211.53.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched6.12.0-211.53.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules6.12.0-211.53.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-core6.12.0-211.53.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra6.12.0-211.53.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel6.12.0-211.53.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel-matched6.12.0-211.53.1.el10_2 · AlmaLinux:10Package registry (OSV)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:6.12.0-211.53.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel0:6.12.0-211.53.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel-matched0:6.12.0-211.53.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debuginfo0:6.12.0-211.53.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel0:6.12.0-211.53.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel-matched0:6.12.0-211.53.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-debuginfo0:6.12.0-211.53.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel0:6.12.0-211.53.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel-matched0:6.12.0-211.53.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)

+5

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Adjacent
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records