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CVE-2026-64406

HIGHCVSS 8/10EPSS 0.27%

Last modified

CVE-2026-64406 is a high-severity vulnerability rated 8/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix UAF in bt_accept_dequeue() bt_accept_get() takes a temporary reference before dropping the accept queue lock. bt_accept_dequeue() currently drops that reference before bt_accept_unlink(), leaving only the queue reference. bt_accept_unlink() drops the queue reference. EPSS estimates a 0.27% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix UAF in bt_accept_dequeue() bt_accept_get() takes a temporary reference before dropping the accept queue lock. bt_accept_dequeue() currently drops that reference before bt_accept_unlink(), leaving only the queue reference. bt_accept_unlink() drops the queue reference. The subsequent sock_hold() therefore accesses freed memory if it was the final reference, as observed by KASAN during listening L2CAP socket cleanup. Retain the temporary queue-walk reference through unlink and hand it to the caller on success. Drop it explicitly on the closed and not-yet-connected paths.

Metrics

CVSS 3.1
8/10

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

EPSS Probability
0.27%

19.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 751de6ec671fe75ad9cf65a0638d2a06b6a5984d, < c0577c55219be42b6ea2ea8db11e85bfab6f4e8d; >= 407217734835d21d4e0105ebf347860dc1806f88, < 96ad400d5132eb333f28f6f1e2d58f0728ca9547; >= 7eebd4c2c86f573af87ff165d08a83432eb0b919, < 0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0; >= 5d86d2f1b4d9a508c441d3e45277ae1a73cfed57, < c66a95e60b65d876a927123b0ed36bd6177d9ca6; >= 87c543e2f78d0871f271df92dab98901bbd5b6f5, < 6303ed4bbe0095f4cc195225479bf506e010d1db; >= added1213395071470a900cc845a042fb51882a6, < 26168db1ce5a9766cde021b18e590a101c056614; >= ab1513597c6cf17cd1ad2a21e3b045421b48e022, < 50c662bdcd51b03033a0abed6716bfd377ba1049; >= ab1513597c6cf17cd1ad2a21e3b045421b48e022, < 4bd0b274054f2679f28b70222b607bb0afc3ab9a; a5ca86a6097a8b030ca3226cd300b17ed330f966; >= 5.10.259, < 5.10.261; >= 5.15.210, < 5.15.212; >= 6.1.175, < 6.1.178; >= 6.6.142, < 6.6.145; >= 6.12.92, < 6.12.96; >= 6.18.34, < 6.18.39; >= 7.0.11, < 7.1
LinuxLinux7.1

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-64406?
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix UAF in bt_accept_dequeue() bt_accept_get() takes a temporary reference before dropping the accept queue lock. bt_accept_dequeue() currently drops that reference before bt_accept_unlink(), leaving only the queue reference. bt_accept_unlink() drops the queue reference. The subsequent sock_hold() therefore accesses freed memory if it was the final reference, as observed by KASAN during listening L2CAP socket cleanup. Retain the temporary queue-walk reference through unlink and hand it to the caller on success. Drop it explicitly on the closed and not-yet-connected paths.
How severe is CVE-2026-64406?
CVE-2026-64406 has a CVSS score of 8/10 (HIGH severity). The EPSS model estimates a 0.27% probability of exploitation in the next 30 days.
How do I fix CVE-2026-64406?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST