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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-98457: Bluetooth: L2CAP: validate frame length before control and FCS access

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.18% (FIRST EPSS).
  • Fixed version: Linux Linux 1fdbb2a712a9a162ee817c959740face80b3d929, 3acf6a0038ec0d4e8f4dcbfc2a557dff5f61cb70, 4373ba79a267947e771c438507f7b103e30bdb21; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 1fdbb2a712a9a162ee817c959740face80b3d929, 3acf6a0038ec0d4e8f4dcbfc2a557dff5f61cb70, 4373ba79a267947e771c438507f7b103e30bdb21; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1 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: L2CAP: validate frame length before control and FCS access l2cap_data_rcv() unpacks either a two-byte or four-byte control field without first ensuring that it is present. A short ERTM or streaming-mode frame can therefore cause an out-of-bounds read. There is a second short-frame case when CRC16 is enabled. After the control field is pulled, l2cap_check_fcs() subtracts two from skb->len without checking it. If fewer than two bytes remain, the subtraction wraps; skb_trim() leaves the buffer unchanged and the subsequent FCS load reads past the logical end of the frame. Validate that the frame contains both its control field and, when enabled, its FCS before either field is accessed.

—No exploit Fix available
Published
Oct 18, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 8th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • 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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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.

—

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

    • 2.6.32affected
    • 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a and later · before 4373ba79a267947e771c438507f7b103e30bdb21affected · git
    • 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a and later · before 965bd88ed4b4763cb765dd65885adcfa588c6b14affected · git
    • 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a and later · before 3acf6a0038ec0d4e8f4dcbfc2a557dff5f61cb70affected · git
    • 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a and later · before 8c7556c7cd17e073bbefdc4a9a4694a207544c37affected · git
    • 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a and later · before 1fdbb2a712a9a162ee817c959740face80b3d929affected · git
    • 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a and later · before c6a288e6001bcce16553c3853e0f5a45eaaf85c7affected · git
    • 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a and later · before f557274af7b94b6134692e6f26b880f1e34c15bfaffected · git
    • 1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a and later · before 6c78a213d9070b610c7f418af2c25b66180b7e37affected · git
    • before 2.6.32not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.9-17.2.9-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-98455Oct 18, 2026 · Bluetooth: RFCOMM: fix NULL dereference of dlc->session in RFCOMM_CONNINFO
    0Monitor
  • ← EarlierCVE-2026-98456Oct 18, 2026 · Bluetooth: mgmt: fix race in read_unconf_index_list()
    28Monitor
  • Later →CVE-2026-98458Oct 18, 2026 · Bluetooth: ISO: release unused CIS holds after channel attach
    0Monitor

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 Linux1fdbb2a712a9a162ee817c959740face80b3d929Vendor (CNA)
Linux Linux3acf6a0038ec0d4e8f4dcbfc2a557dff5f61cb70Vendor (CNA)
Linux Linux4373ba79a267947e771c438507f7b103e30bdb21Vendor (CNA)
Linux Linux6c78a213d9070b610c7f418af2c25b66180b7e37Vendor (CNA)
Linux Linux8c7556c7cd17e073bbefdc4a9a4694a207544c37Vendor (CNA)
Linux Linux965bd88ed4b4763cb765dd65885adcfa588c6b14Vendor (CNA)
Linux Linuxc6a288e6001bcce16553c3853e0f5a45eaaf85c7Vendor (CNA)
Linux Linuxf557274af7b94b6134692e6f26b880f1e34c15bfVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.159.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · 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.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 9, 2026+22 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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).

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

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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. Exploit maturity— → 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