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Vulnerability · Published Apr 16, 2025 · Assigned by Linux

CVE-2025-23134ALSA: timer: Don't take register_mutex with copy_from/to_user()

Medium 5.5

In plain English

A medium-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.1%top 96.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official description

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)(&register_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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13linux6.12.25-1DEBIAN-CVE-2025-23134
Debian:14linux6.12.25-1DEBIAN-CVE-2025-23134
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-23134
Ubuntu:24.04:LTSlinux-azure-6.116.11.0-1018.18~24.04.1UBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-23134
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-23134
Ubuntu:24.04:LTSlinux-gcp-6.116.11.0-1016.16~24.04.1UBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-23134
Ubuntu:24.04:LTSlinux-hwe-6.116.11.0-28.28~24.04.1UBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-23134
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.116.11.0-1015.16~24.04.2UBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-23134
Ubuntu:24.04:LTSlinux-nvidia-6.116.11.0-1012.12UBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-23134
Ubuntu:24.04:LTSlinux-oem-6.116.11.0-1024.24UBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-23134
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-23134
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2025-23134
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2025-23134

Affected products (as reported)

VendorProductVersions
Linux Linux 3923de04c81733b30b8ed667569632272fdfed9a – before 15291b561d8cc835a2eea76b394070cf8e0727713923de04c81733b30b8ed667569632272fdfed9a – before 296f7a9e15aab276db11206cbc1e2ae1215d78623923de04c81733b30b8ed667569632272fdfed9a – before b074f47e55df93832bbbca1b524c501e6fea1c0d3923de04c81733b30b8ed667569632272fdfed9a – before 3424c8f53bc63c87712a7fc22dc13d0cc85fb0d6
Linux Linux 6.9

Weakness: CWE-667 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References