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NVD / CVE Program· CNA Linux

CVE-2026-90254: Bluetooth: hci_sync: free the advertising instance on the failure and cancel paths

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: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 120d8dc042e3d45073bb6e50ee7b058a0b182627, 193182c6467f508a8a61d5db506d796ffed6eee6, 2e3d827cd56865c14f6ca118bbccd7801091fb21.

Low priority for now. Upgrade to Linux Linux 120d8dc042e3d45073bb6e50ee7b058a0b182627, 193182c6467f508a8a61d5db506d796ffed6eee6, 2e3d827cd56865c14f6ca118bbccd7801091fb21 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: hci_sync: free the advertising instance on the failure and cancel paths adv_timeout_expire() hands a kmalloc()ed instance byte to hci_cmd_sync_queue() with a NULL destroy callback, and only adv_timeout_expire_sync() frees it. That leaks on two paths: - the return value is not checked, and hci_cmd_sync_queue() does not take ownership when it fails (-ENETDOWN, -ENODEV, -ENOMEM); - a cancelled entry is not released, as _hci_cmd_sync_cancel_entry() does not free entry->data when there is no destroy callback. hci_cmd_sync_clear() cancels every pending entry when the controller is unregistered. Free the buffer from a destroy callback, and in the caller when the entry could not be queued at all.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 10th 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 · 0.2%

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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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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

    • 6.1affected
    • c249ea9b4309cf3250c5bbb42a05d38d0ed9071c and later · before c2019224a766245b7db39d87fdfe84c3fdc879d9affected · git
    • c249ea9b4309cf3250c5bbb42a05d38d0ed9071c and later · before 193182c6467f508a8a61d5db506d796ffed6eee6affected · git
    • c249ea9b4309cf3250c5bbb42a05d38d0ed9071c and later · before 2e3d827cd56865c14f6ca118bbccd7801091fb21affected · git
    • c249ea9b4309cf3250c5bbb42a05d38d0ed9071c and later · before 9c3b6c1413bd0b4993642d987616331f84d9b7f5affected · git
    • c249ea9b4309cf3250c5bbb42a05d38d0ed9071c and later · before bb5ca1cc7744c41c59002bd6523714a685ae6595affected · git
    • c249ea9b4309cf3250c5bbb42a05d38d0ed9071c and later · before 120d8dc042e3d45073bb6e50ee7b058a0b182627affected · git
    • before 6.1not affected · semver
    • 6.1.188 and later · up to and including 6.1.*not affected · semver
    • 6.6.157 and later · up to and including 6.6.*not 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 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

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-2026-90252Sep 17, 2026 · Bluetooth: MGMT: free the HCI command when it is cancelled
    0Monitor
  • ← EarlierCVE-2026-90253Sep 17, 2026 · Bluetooth: MGMT: free the mesh send cancel command when it is cancelled
    0Monitor
  • Later →CVE-2026-90255Sep 17, 2026 · Bluetooth: hci_conn: fix the SCO setup context lifetime
    35Monitor

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 Linux120d8dc042e3d45073bb6e50ee7b058a0b182627Vendor (CNA)
Linux Linux193182c6467f508a8a61d5db506d796ffed6eee6Vendor (CNA)
Linux Linux2e3d827cd56865c14f6ca118bbccd7801091fb21Vendor (CNA)
Linux Linux9c3b6c1413bd0b4993642d987616331f84d9b7f5Vendor (CNA)
Linux Linuxbb5ca1cc7744c41c59002bd6523714a685ae6595Vendor (CNA)
Linux Linuxc2019224a766245b7db39d87fdfe84c3fdc879d9Vendor (CNA)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~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.

No dated events beyond publication.

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).

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. Fix✗ → ✓

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References

Show all references (5 more)

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

All records