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

CVE-2026-98456: Bluetooth: mgmt: fix race in read_unconf_index_list()

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: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: Linux Linux 2e8bba0360d1379bfa8da47c8f5dadbb10a3fba1, 416546cd6a54e9b68f2b91bc680b1ee17dcd77a1, 524e0450dd9a396f99a81b045219b0e2ea0dab57; 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 2e8bba0360d1379bfa8da47c8f5dadbb10a3fba1, 416546cd6a54e9b68f2b91bc680b1ee17dcd77a1, 524e0450dd9a396f99a81b045219b0e2ea0dab57; 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: mgmt: fix race in read_unconf_index_list() read_unconf_index_list() counts unconfigured controllers before allocating its response, then checks the device flags again while filling it. hci_dev_list_lock stabilizes list membership, but it does not serialize the per-device flags. During asynchronous controller setup, the worker can set HCI_UNCONFIGURED and clear HCI_SETUP between the two passes. A controller omitted from the allocation count can then become eligible for the fill pass, causing an out-of-bounds write to rp->index[]. Allocate space for every device on hci_dev_list. Since list membership cannot change while hci_dev_list_lock is held, the response remains large enough regardless of flag transitions. The reported count and response length still include only eligible unconfigured controllers.

HighCVSS 7.0 · v3.1—No exploit Fix available
Published
Oct 18, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 2th percentile
CWE
—

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.0
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.

Follow CVE-2026-98456

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.

—

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

    • 3.17affected
    • 73d1df2a7a1036a1f000e5f0ece6ade3e082b854 and later · before fa6f79bb0009406bb11e6912b53ab7c564d6f06baffected · git
    • 73d1df2a7a1036a1f000e5f0ece6ade3e082b854 and later · before 76dc7e0297f6f7ebefc36a69251e3f4a676d9853affected · git
    • 73d1df2a7a1036a1f000e5f0ece6ade3e082b854 and later · before 9c32455f490b960efccedd041c7aabb1a04c5cc4affected · git
    • 73d1df2a7a1036a1f000e5f0ece6ade3e082b854 and later · before 524e0450dd9a396f99a81b045219b0e2ea0dab57affected · git
    • 73d1df2a7a1036a1f000e5f0ece6ade3e082b854 and later · before 8ddf962c76432a10a6cb80042875cbc48a9c056baffected · git
    • 73d1df2a7a1036a1f000e5f0ece6ade3e082b854 and later · before 416546cd6a54e9b68f2b91bc680b1ee17dcd77a1affected · git
    • 73d1df2a7a1036a1f000e5f0ece6ade3e082b854 and later · before 2e8bba0360d1379bfa8da47c8f5dadbb10a3fba1affected · git
    • 73d1df2a7a1036a1f000e5f0ece6ade3e082b854 and later · before b5dbb41b212c50c095a4dbee3017a84fe94f033baffected · git
    • before 3.17not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
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-2026-98454Oct 18, 2026 · smb: client: fix create context out-of-bounds reads
    32Monitor
  • ← EarlierCVE-2026-98455Oct 18, 2026 · Bluetooth: RFCOMM: fix NULL dereference of dlc->session in RFCOMM_CONNINFO
    0Monitor
  • Later →CVE-2026-98457Oct 18, 2026 · Bluetooth: L2CAP: validate frame length before control and FCS access
    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 Linux2e8bba0360d1379bfa8da47c8f5dadbb10a3fba1Vendor (CNA)
Linux Linux416546cd6a54e9b68f2b91bc680b1ee17dcd77a1Vendor (CNA)
Linux Linux524e0450dd9a396f99a81b045219b0e2ea0dab57Vendor (CNA)
Linux Linux76dc7e0297f6f7ebefc36a69251e3f4a676d9853Vendor (CNA)
Linux Linux8ddf962c76432a10a6cb80042875cbc48a9c056bVendor (CNA)
Linux Linux9c32455f490b960efccedd041c7aabb1a04c5cc4Vendor (CNA)
Linux Linuxb5dbb41b212c50c095a4dbee3017a84fe94f033bVendor (CNA)
Linux Linuxfa6f79bb0009406bb11e6912b53ab7c564d6f06bVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.159.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.12.113-1 · Debian:13Package 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 10, 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

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

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

Weakness class (CWE)

—

CVSS vector

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

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

Change log

  1. CVSS— → 7
  2. Severity— → high
  3. Exploit maturity— → none
  4. 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