Medium 5.5Published Jun 25, 2026

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

Updated under an hour ago (Oct 27, 2026, 4:50 PM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Jun 25, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	1360e5b6ce63d63d23223a659ca2bbafa30a53aa builds before 4bbec25f47b930101294fd310c627c3f53e9661f; from 07a9342b94a91b306ed1cf6aa8254aea210764c9 before 33d677d2e3713d98012c3dbd4a9207f7d785b854; from 07a9342b94a91b306ed1cf6aa8254aea210764c9 before 23e8eb16820b866528fb300dc67fe3f67f00ef62; 07a9342b94a91b306ed1cf6aa8254aea210764c9 builds before 5cbf290b79351971f20c7a533247e8d58a3f970c; bfec1e55314896bf4a4cfdb3a9ad4872be9f06ed; from 6.12.2 before 6.12.94; from 6.11.11 before 6.12	CNA record
linux linux_kernel linux:linux_kernel	from 6.11.11 before 6.12; from 6.12.2 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 7.1; 7.1; 7.1; 7.1; and 2 more ranges	NVD

References

References

https://git.kernel.org/stable/c/4bbec25f47b930101294fd310c627c3f53e9661f	patch
https://git.kernel.org/stable/c/33d677d2e3713d98012c3dbd4a9207f7d785b854	patch
https://git.kernel.org/stable/c/23e8eb16820b866528fb300dc67fe3f67f00ef62	patch
https://git.kernel.org/stable/c/5cbf290b79351971f20c7a533247e8d58a3f970c	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.