What is CVE-2026-53251?

CVE-2026-53251 is a medium-severity vulnerability in Linux, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 5.5/10. Published 2026-06-25.

How severe is CVE-2026-53251?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Linux

CVE-2026-53251

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.

Published 2026-06-25 · last modified 2026-07-08.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.001 (1.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 1.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.001 · change: -0.000

Affected products

Linux — versions 1360e5b6ce63d63d23223a659ca2bbafa30a53aa, 07a9342b94a91b306ed1cf6aa8254aea210764c9, bfec1e55314896bf4a4cfdb3a9ad4872be9f06ed
Linux Kernel — versions 7.1

Weakness classification (CWE)

CWE-772 — Missing Release of Resource after Effective Lifetime

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)

Frequently asked questions

What is CVE-2026-53251?: CVE-2026-53251 is a medium-severity vulnerability in Linux, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 5.5/10. Published 2026-06-25.
How severe is CVE-2026-53251?: Medium severity. CVSS v3 base score is 5.5 out of 10.