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NVD / CVE Program· CNA Linux

CVE-2026-53251: Bluetooth: ISO: Fix not releasing hdev reference on iso_conn_big_sync

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 23e8eb16820b866528fb300dc67fe3f67f00ef62, 33d677d2e3713d98012c3dbd4a9207f7d785b854, 4bbec25f47b930101294fd310c627c3f53e9661f.

Low priority for now. Upgrade to Linux Linux 23e8eb16820b866528fb300dc67fe3f67f00ef62, 33d677d2e3713d98012c3dbd4a9207f7d785b854, 4bbec25f47b930101294fd310c627c3f53e9661f 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: ISO: Fix not releasing hdev reference on iso_conn_big_sync hci_get_route() returns a reference-counted hci_dev pointer via hci_dev_hold(). The function exits normally or with an error without ever releasing it.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jun 25, 2026
Updated
Nov 6, 2026
EPSS
0.1% · 1th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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

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

Follow CVE-2026-53251

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 kernel6.11.11 and later · before 6.12
  • linux linux kernel6.12.2 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 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

    • bfec1e55314896bf4a4cfdb3a9ad4872be9f06ed, 6.13affected
    • 1360e5b6ce63d63d23223a659ca2bbafa30a53aa and later · before 4bbec25f47b930101294fd310c627c3f53e9661faffected · git
    • 07a9342b94a91b306ed1cf6aa8254aea210764c9 and later · before 33d677d2e3713d98012c3dbd4a9207f7d785b854affected · git
    • 07a9342b94a91b306ed1cf6aa8254aea210764c9 and later · before 23e8eb16820b866528fb300dc67fe3f67f00ef62affected · git
    • 07a9342b94a91b306ed1cf6aa8254aea210764c9 and later · before 5cbf290b79351971f20c7a533247e8d58a3f970caffected · git
    • 6.12.2 and later · before 6.12.94affected · semver
    • 6.11.11 and later · before 6.12affected · semver
    • before 6.13not affected · semver
    • 6.12.94 and later · up to and including 6.12.*not affected · semver
    • 6.18.36 and later · up to and including 6.18.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:13linuxbefore 6.12.94-16.12.94-1
Debian:14linuxbefore 7.0.13-17.0.13-1

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-2026-53249Jun 25, 2026 · ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options
    22Monitor
  • ← EarlierCVE-2026-53250Jun 25, 2026 · xsk: cache csum_start/csum_offset to fix TOCTOU in xsk_skb_metadata()
    31Monitor
  • Later →CVE-2026-53252Jun 25, 2026 · Bluetooth: fix memory leak in error path of hci_alloc_dev()
    22Monitor

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 Linux23e8eb16820b866528fb300dc67fe3f67f00ef62Vendor (CNA)
Linux Linux33d677d2e3713d98012c3dbd4a9207f7d785b854Vendor (CNA)
Linux Linux4bbec25f47b930101294fd310c627c3f53e9661fVendor (CNA)
Linux Linux5cbf290b79351971f20c7a533247e8d58a3f970cVendor (CNA)
Linux Linux6.12Vendor (CNA)
Linux Linux6.12.94Vendor (CNA)
debian:linux6.12.94-1 · Debian:13Package 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-2026-6400324 days apartscsi: core: Run queues for all non-SDEV_DEL devices from scsi_run_host_queues
    30Monitor
  • CVE-2022-50189372 days aparttools/power turbostat: Fix file pointer leak
    28Monitor
  • CVE-2026-531540 days apartmm/hugetlb: restore reservation on error in hugetlb folio copy paths
    22Monitor
  • CVE-2026-4629217 days apartpmdomain: core: Fix detach procedure for virtual devices in genpd
    22Monitor
  • CVE-2026-4331448 days apartdm: remove fake timeout to avoid leak request
    22Monitor
  • CVE-2026-4325750 days apartmedia: cx88: Add missing unmap in snd_cx88_hw_params()
    22Monitor

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 with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

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

Weakness class (CWE)

CWE-772 · Missing Release of Resource after Effective Lifetime

CVSS vector

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

nvd-primary

Attack context

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

Attack patterns (CAPEC)

Change log

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

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

References

Show all references (3 more)

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

All records