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NVD / CVE Program· CNA Linux

CVE-2026-43062: Bluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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: 0.21% (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 111f74547eee8cfedfb854284e80f35c8a491186, 15145675690cab2de1056e7ed68e59cbd0452529, 21d3ba696918d6373233aac0b9d51fcabdedddc0.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 111f74547eee8cfedfb854284e80f35c8a491186, 15145675690cab2de1056e7ed68e59cbd0452529, 21d3ba696918d6373233aac0b9d51fcabdedddc0 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: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp() l2cap_ecred_reconf_rsp() casts the incoming data to struct l2cap_ecred_conn_rsp (the ECRED *connection* response, 8 bytes with result at offset 6) instead of struct l2cap_ecred_reconf_rsp (2 bytes with result at offset 0). This causes two problems: - The sizeof(*rsp) length check requires 8 bytes instead of the correct 2, so valid L2CAP_ECRED_RECONF_RSP packets are rejected with -EPROTO. - rsp->result reads from offset 6 instead of offset 0, returning wrong data when the packet is large enough to pass the check. Fix by using the correct type. Also pass the already byte-swapped result variable to BT_DBG instead of the raw __le16 field.

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
May 5, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 12th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 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
7.1
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

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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

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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 kernel5.7 and later · before 5.10.253
  • linux linux kernel5.11 and later · before 5.15.203
  • linux linux kernel5.16 and later · before 6.1.167
  • linux linux kernel6.2 and later · before 6.6.130
  • linux linux kernel6.7 and later · before 6.12.78
  • linux linux kernel6.13 and later · before 6.18.20
  • linux linux kernel6.19 and later · before 6.19.10
  • linux linux kernel7.0

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

    • 5.7affected
    • 15f02b91056253e8cdc592888f431da0731337b8 and later · before 21d3ba696918d6373233aac0b9d51fcabdedddc0affected · git
    • 15f02b91056253e8cdc592888f431da0731337b8 and later · before 3b94e62caa1dc1198d0d55d97bd710da1dee15d7affected · git
    • 15f02b91056253e8cdc592888f431da0731337b8 and later · before 111f74547eee8cfedfb854284e80f35c8a491186affected · git
    • 15f02b91056253e8cdc592888f431da0731337b8 and later · before dd3b221e21079ade8263fbb7176f3d55ad75d3b6affected · git
    • 15f02b91056253e8cdc592888f431da0731337b8 and later · before d90150c72d2e6a8a3079e88755dafcfbe91c746daffected · git
    • 15f02b91056253e8cdc592888f431da0731337b8 and later · before 5a1ea296f8589ce8f1e3141b2b123b34ad010e19affected · git
    • 15f02b91056253e8cdc592888f431da0731337b8 and later · before f110b8f58b254bf997cec1bd60701b7798e9bb82affected · git
    • 15f02b91056253e8cdc592888f431da0731337b8 and later · before 15145675690cab2de1056e7ed68e59cbd0452529affected · git
    • before 5.7not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.10-16.19.10-1

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-2026-43060May 5, 2026 · netfilter: nft_ct: drop pending enqueued packets on removal
    31Monitor
  • ← EarlierCVE-2026-43061May 5, 2026 · serial: 8250: Fix TX deadlock when using DMA
    22Monitor
  • Later →CVE-2026-43063May 5, 2026 · xfs: don't irele after failing to iget in xfs_attri_recover_work
    31Monitor

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 Linux111f74547eee8cfedfb854284e80f35c8a491186Vendor (CNA)
Linux Linux15145675690cab2de1056e7ed68e59cbd0452529Vendor (CNA)
Linux Linux21d3ba696918d6373233aac0b9d51fcabdedddc0Vendor (CNA)
Linux Linux3b94e62caa1dc1198d0d55d97bd710da1dee15d7Vendor (CNA)
Linux Linux5a1ea296f8589ce8f1e3141b2b123b34ad010e19Vendor (CNA)
Linux Linuxd90150c72d2e6a8a3079e88755dafcfbe91c746dVendor (CNA)
Linux Linuxdd3b221e21079ade8263fbb7176f3d55ad75d3b6Vendor (CNA)
Linux Linuxf110b8f58b254bf997cec1bd60701b7798e9bb82Vendor (CNA)
debian:linux6.1.170-1 · Debian:12Package registry (OSV)

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.

  • CVE-2026-3150213 days apartteam: fix header_ops type confusion with non-Ethernet ports
    31Monitor

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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

Weakness class (CWE)

CWE-843 · Access of Resource Using Incompatible Type ('Type Confusion')

CVSS vector

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

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.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

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