In the Linux kernel, the following vulnerability has been resolved:
ALSA: timer: Don't take register_mutex with copy_from/to_user()
The infamous mmap_lock taken in copy_from/to_user() can be often problematic when it's called inside another mutex, as they might lead to deadlocks.
In the case of ALSA timer code, the bad pattern is with guard(mutex)(®ister_mutex) that covers copy_from/to_user() -- which was mistakenly introduced at converting to guard(), and it had been carefully worked around in the past.
This patch fixes those pieces simply by moving copy_from/to_user() out of the register mutex lock again.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Apr 16, 2025 |
| Suse | — | Upgrade kernel-kvmsmall-vdsoUpgrade kernel-64kb-extraUpgrade kernel-azure-develUpgrade kernel-docs-htmlUpgrade kernel-azure-vdsoUpgrade kernel-docsUpgrade kernel-defaultUpgrade kernel-default-baseUpgrade kernel-source-vanillaUpgrade kernel-obs-buildUpgrade kernel-default-livepatchUpgrade kernel-azureUpgrade kernel-macrosUpgrade kernel-kvmsmallUpgrade kernel-default-develUpgrade kernel-64kb-develUpgrade kernel-sourceUpgrade kernel-develUpgrade kernel-obs-qaUpgrade kernel-default-vdsoUpgrade reiserfs-kmp-defaultUpgrade kernel-source-azureUpgrade kernel-64kbUpgrade kernel-zfcpdumpUpgrade kernel-default-extraUpgrade kernel-kvmsmall-develUpgrade kernel-symsUpgrade kernel-azure-extraUpgrade kernel-devel-azureUpgrade kernel-syms-azure | Dec 5, 2025 | Jun 13, 2025 |
| Ubuntu | — | Upgrade linux-image-lowlatency-6.11Upgrade linux-image-6.14.0-1008-gcp-64kUpgrade linux-image-6.11.0-1017-oracleUpgrade linux-image-6.11.0-1014-raspiUpgrade linux-image-6.14.0-1007-azure-fdeUpgrade linux-image-aws-64kUpgrade linux-image-azure-fde-6.11Upgrade linux-image-virtualUpgrade linux-image-realtimeUpgrade linux-image-6.14.0-22-genericUpgrade linux-image-6.14.0-1007-azureUpgrade linux-image-6.11.0-28-generic-64kUpgrade linux-image-gcp-64kUpgrade linux-image-6.14.0-1007-oracleUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-6.11.0-1015-lowlatency-64kUpgrade linux-image-oracle-64kUpgrade linux-image-lowlatency-64k-6.11Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-oracleUpgrade linux-image-6.11.0-1016-gcpUpgrade linux-image-6.11.0-1015-lowlatencyUpgrade linux-image-6.14.0-1004-realtimeUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-awsUpgrade linux-image-6.11.0-1016-gcp-64kUpgrade linux-image-6.14.0-22-generic-64kUpgrade linux-image-6.11.0-1011-realtimeUpgrade linux-image-6.14.0-1007-awsUpgrade linux-image-6.11.0-1018-azureUpgrade linux-image-azureUpgrade linux-image-lowlatency-hwe-24.04Upgrade linux-image-6.11.0-1024-oemUpgrade linux-image-azure-fde-edgeUpgrade linux-image-generic-64kUpgrade linux-image-raspiUpgrade linux-image-6.11.0-1017-oracle-64kUpgrade linux-image-lowlatency-64k-hwe-24.04Upgrade linux-image-6.11.0-1018-azure-fdeUpgrade linux-image-6.14.0-1008-gcpUpgrade linux-image-gcpUpgrade linux-image-6.14.0-1007-oracle-64kUpgrade linux-image-azure-6.11Upgrade linux-image-oem-24.04bUpgrade linux-image-6.11.0-1015-awsUpgrade linux-image-6.14.0-1007-raspiUpgrade linux-image-6.14.0-1007-aws-64kUpgrade linux-image-lowlatencyUpgrade linux-image-lowlatency-64kUpgrade linux-image-genericUpgrade linux-image-azure-fdeUpgrade linux-image-6.11.0-28-generic | Jun 26, 2025 | Apr 16, 2025 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub