CVE-2026-63946
Bluetooth: ISO: fix UAF in iso_recv_frame
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix UAF in iso_recv_frame iso_recv_frame reads conn->sk under iso_conn_lock but releases the lock before using sk, with no reference held. A concurrent iso_sock_kill() can free sk in that window, causing use-after-free on sk->sk_state and sock_queue_rcv_skb(). Fix by replacing the bare pointer read with iso_sock_hold(conn), which calls sock_hold() while the spinlock is held, atomically elevating the refcount before the lock drops. Add a drop_put label so sock_put() is called on all exit paths where the hold succeeded.
INFO
Published Date :
July 19, 2026, 4:17 p.m.
Last Modified :
July 27, 2026, 5:44 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Apply the provided patch to the Linux kernel.
- Ensure sock_hold() is called before lock release.
- Verify sock_put() is called on all exit paths.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-63946.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-63946 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-63946
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-63946 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-63946 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 20, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'ccf74f2390d60a2f9a75ef496d2564abb478f46a', 'lessThan': 'c57ea90f203c8b8b41a474f19a09000d0f841436', 'versionType': 'git'}, {'status': 'affected', 'version': 'ccf74f2390d60a2f9a75ef496d2564abb478f46a', 'lessThan': '119fb6f80c44dc1c65d604cf28e64c56bd9b6568', 'versionType': 'git'}, {'status': 'affected', 'version': 'ccf74f2390d60a2f9a75ef496d2564abb478f46a', 'lessThan': 'b04ec131325baf4ea4577d6c6e6b86cf092e3731', 'versionType': 'git'}, {'status': 'affected', 'version': 'ccf74f2390d60a2f9a75ef496d2564abb478f46a', 'lessThan': 'c318aa51830a3d2cc1229968fe521441c97356cd', 'versionType': 'git'}, {'status': 'affected', 'version': 'ccf74f2390d60a2f9a75ef496d2564abb478f46a', 'lessThan': '1a6b803b00ccdd7666506adbe01ddae1c72d1ca9', 'versionType': 'git'}, {'status': 'affected', 'version': 'ccf74f2390d60a2f9a75ef496d2564abb478f46a', 'lessThan': '47f23a259517abbdb8032c057a1e8a6bf3734878', 'versionType': 'git'}], 'programFiles': ['net/bluetooth/iso.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.1.176', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.93', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.35', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.12', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/bluetooth/iso.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix UAF in iso_recv_frame iso_recv_frame reads conn->sk under iso_conn_lock but releases the lock before using sk, with no reference held. A concurrent iso_sock_kill() can free sk in that window, causing use-after-free on sk->sk_state and sock_queue_rcv_skb(). Fix by replacing the bare pointer read with iso_sock_hold(conn), which calls sock_hold() while the spinlock is held, atomically elevating the refcount before the lock drops. Add a drop_put label so sock_put() is called on all exit paths where the hold succeeded. Added Reference https://git.kernel.org/stable/c/119fb6f80c44dc1c65d604cf28e64c56bd9b6568 Added Reference https://git.kernel.org/stable/c/1a6b803b00ccdd7666506adbe01ddae1c72d1ca9 Added Reference https://git.kernel.org/stable/c/47f23a259517abbdb8032c057a1e8a6bf3734878 Added Reference https://git.kernel.org/stable/c/b04ec131325baf4ea4577d6c6e6b86cf092e3731 Added Reference https://git.kernel.org/stable/c/c318aa51830a3d2cc1229968fe521441c97356cd Added Reference https://git.kernel.org/stable/c/c57ea90f203c8b8b41a474f19a09000d0f841436