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NVD / CVE Program· CNA Linux

CVE-2026-53252: Bluetooth: fix memory leak in error path of hci_alloc_dev()

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: 0.13% (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 0622e527a31d4b44737fed5c1a2ac1fc2cfb5184, 37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f, 5.11; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1.

Low priority for now. Upgrade to Linux Linux 0622e527a31d4b44737fed5c1a2ac1fc2cfb5184, 37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f, 5.11; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1 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: fix memory leak in error path of hci_alloc_dev() Early failures in Bluetooth HCI UART configuration leak SRCU percpu memory. When device initialization fails before hci_register_dev() completes, the HCI_UNREGISTER flag is never set. As a result, when the device reference count reaches zero, bt_host_release() evaluates this flag as false and falls back to a direct kfree(hdev). Because hci_release_dev() is bypassed, the SRCU struct initialized early in hci_alloc_dev() is never cleaned up, resulting in a leak of percpu memory. Fix the leak by explicitly calling cleanup_srcu_struct() in the fallback (unregistered) branch of bt_host_release() before freeing the device.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jun 25, 2026
Updated
Jul 8, 2026
EPSS
0.1% · 2th 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%

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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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 kernel5.10.259 and later · before 5.11
  • linux linux kernel6.1.167 and later · before 6.1.176
  • linux linux kernel6.6.97 and later · before 6.6.143
  • linux linux kernel6.12.36 and later · before 6.12.94
  • linux linux kernel6.15.5 and later · before 6.16
  • linux linux kernel6.16.1 and later · before 6.18.36
  • linux linux kernel6.19 and later · before 7.0.13
  • linux linux kernel5.15.209
  • linux linux kernel6.16
  • 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

    • dd4becd3fd4102696e1c15e6d260a1712a2d8685, 0e5c144c557df910ab64d9c25d06399a9a735e65, 6.16affected
    • 90dee0a0ff84fac8accd5be98412b3819f667149 and later · before 5b7dfca6f852e6b9d809fd0263b5427cc9fb33fdaffected · git
    • c56b177efce8b62798e4d96bdb9867106cb7c4a0 and later · before c016118b9e51eeaf5bc93850d4c455a3b583c0aaaffected · git
    • bc0819a25e04cd68ef3568cfa51b63118fea39a7 and later · before 0622e527a31d4b44737fed5c1a2ac1fc2cfb5184affected · git
    • ce23b73f0f27e2dbeb81734a79db710f05aa33c6 and later · before bc2efe73c194a74839d7cf57b63880d97e21d309affected · git
    • 1d6123102e9fbedc8d25bf4731da6d513173e49e and later · before ce4b4cac3c5749b6aa75e62e2991ae2263f2f889affected · git
    • 1d6123102e9fbedc8d25bf4731da6d513173e49e and later · before f82799407a50af7bcacacf09cc9b279af8fe9b81affected · git
    • 1d6123102e9fbedc8d25bf4731da6d513173e49e and later · before 37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37faffected · git
    • 5.15.209 and later · before 5.15.210affected · semver
    • 6.1.167 and later · before 6.1.176affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
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-2026-53248Jun 25, 2026 · net: airoha: Fix use-after-free in metadata dst teardown
    35Monitor
  • ← EarlierCVE-2026-53251Jun 25, 2026 · Bluetooth: ISO: Fix not releasing hdev reference on iso_conn_big_sync
    22Monitor
  • Later →CVE-2026-53259Jun 25, 2026 · ipv6: anycast: insert aca into global hash under idev->lock
    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 Linux0622e527a31d4b44737fed5c1a2ac1fc2cfb5184Vendor (CNA)
Linux Linux37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37fVendor (CNA)
Linux Linux5.11Vendor (CNA)
Linux Linux5.15.210Vendor (CNA)
Linux Linux5b7dfca6f852e6b9d809fd0263b5427cc9fb33fdVendor (CNA)
Linux Linux6.1.176Vendor (CNA)
Linux Linux6.12.94Vendor (CNA)
Linux Linux6.16Vendor (CNA)
Linux Linux6.6.143Vendor (CNA)
Linux Linuxbc2efe73c194a74839d7cf57b63880d97e21d309Vendor (CNA)
Linux Linuxc016118b9e51eeaf5bc93850d4c455a3b583c0aaVendor (CNA)
Linux Linuxce4b4cac3c5749b6aa75e62e2991ae2263f2f889Vendor (CNA)
Linux Linuxf82799407a50af7bcacacf09cc9b279af8fe9b81Vendor (CNA)
azl3 kernel 6.6.141.1-1 on Azure Linux 3.06.6.143.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.176-1 · 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.

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

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-401 · Missing Release of Memory 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.

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

Change log

  1. Fix✗ → ✓

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

References

Show all references (6 more)

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

All records