Security readout for executives and security teams
Plain-English summary
This is a Linux kernel availability issue in the ALSA timer code. A local, low-privileged user could trigger a deadlock condition, potentially making the affected system or service unavailable. The public record does not indicate data theft, data modification, remote access, or active exploitation.
Executive priority
Handle through normal kernel patch management, with higher priority for multi-user or shared compute environments. The business risk is service disruption, not known compromise or data exposure based on the provided sources.
Technical view
The flaw is a locking-order bug in ALSA timer handling. copy_from_user()/copy_to_user() can take mmap_lock, and the affected code called them while holding register_mutex. That pattern can deadlock. The fix moves user-copy operations outside the register_mutex-protected section.
Likely exposure
Exposure appears limited to affected Linux kernels where ALSA timer functionality is present and reachable by local users. The CVSS vector is local, low complexity, low privileges, no user interaction, and availability-only impact. No network attack path is described in the provided sources.
Exploitation context
The source bundle reports no KEV listing and provides no cited evidence of exploitation in the wild. Treat this as a local denial-of-service risk, especially on shared Linux hosts, workstations, build systems, and servers allowing untrusted local users.
Researcher notes
CWE-667 fits the documented improper locking pattern. The affected code path concerns ALSA timer locking around user-copy helpers. Public data names stable kernel commits but does not provide exploit details, distribution package mappings, or evidence of active exploitation.
Mitigation direction
- Apply vendor kernel updates that include the referenced stable ALSA timer fixes.
- Prioritize shared systems where untrusted or semi-trusted users have local shell access.
- Track distribution advisories for exact fixed package versions before rollout.
- If immediate patching is delayed, reduce unnecessary local access to affected hosts.
Validation and detection
- Inventory Linux kernel versions across servers, workstations, and images.
- Check whether vendor packages include fixes for CVE-2025-23134.
- Identify systems with local users or workloads that can reach ALSA timer functionality.
- Confirm updated kernels are running after reboot, not merely installed.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-667: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2025-23134 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/15291b561d8cc835a2eea76b394070cf8e072771CVE reference, Linux
- https://git.kernel.org/stable/c/296f7a9e15aab276db11206cbc1e2ae1215d7862CVE reference, Linux
- https://git.kernel.org/stable/c/b074f47e55df93832bbbca1b524c501e6fea1c0dCVE reference, Linux
- https://git.kernel.org/stable/c/3424c8f53bc63c87712a7fc22dc13d0cc85fb0d6CVE reference, Linux
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Locking
Improper Locking represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.