CVE-2026-64406: Bluetooth: fix UAF in bt_accept_dequeue()
Vulnerability summary
CVE-2026-64406 is a high (CVSS 8.0) Use After Free vulnerability in linux. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 20% of scored vulnerabilities.
Not severe (CVSS 8, adjacent network); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 22 · Related 22Timeline
- 25-07-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated8.0HighCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.0HighCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST8.0HighCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.27%
Chance of exploitation in the next 30 days
Percentile
20%
Versus all other CVEs
30-day change
Decrease -0.15 pp
From 0.43% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: adjacent network, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu129 products
- linuxAll versions (No fix recorded) | < 6.8.0-147.147 | < 7.0.0-31.31
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 6.8.0-1067.70 | < 7.0.0-1012.12
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.180-1 | < 6.12.96-1 | < 7.1.4-1
- linux-6.12< 6.12.100-1~deb12u1
Linux2 products
- linux≥ 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 | 7.1
- linux_kernelEOL≥ 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 | ≥ 7.1.1, < 7.1.4 | 7.1 | 7.1:rc5 | 7.1:rc6 | 7.1:rc7 | 7.2:rc1 | 7.2:rc2
3 vendors · 133 products
