Security readout for executives and security teams
Plain-English summary
A local user may trigger a memory-safety failure in the Linux ALSA OSS mixer while an audio device is disconnecting. Successful exploitation could potentially compromise confidentiality, integrity, and availability. The supplied CVSS score is 7.8, but the source bundle provides no evidence of remote reachability or active exploitation.
Executive priority
Prioritize affected multi-user systems, developer workstations, and hosts running untrusted local workloads. Treat remediation as high priority but below remotely exploitable or confirmed-active threats. Require asset inventory and vendor-version confirmation because the supplied version mapping is incomplete.
Technical view
Pending ALSA OSS mixer kcontrol operations may continue during card disconnection, creating potential use-after-free conditions. The kernel fix adds card-disconnection checks at OSS mixer entry points after acquiring the read-write semaphore. The supplied vector indicates local access, low complexity, low privileges, no user interaction, and potentially high impact.
Likely exposure
Exposure is most likely on Linux systems using affected kernels and the ALSA OSS mixer compatibility layer, particularly where audio devices can disconnect during mixer access. Exact vulnerable version ranges are unclear because the supplied affected-version data is ambiguous; confirm against distribution advisories and the cited stable commits.
Exploitation context
The supplied record is not listed in KEV and contains no evidence of exploitation in the wild. Exploitation would require local low-privileged access according to the CVSS vector. The bundle does not establish exploit reliability, affected configurations, or whether common distributions expose the vulnerable path by default.
Researcher notes
The issue is a potential use-after-free caused by insufficient disconnect checkpoints around individually invoked kcontrol operations. Four stable-kernel commits are cited, apparently covering separate maintained branches. No CWE, reproducer, exploit evidence, or precise branch-to-version mapping is supplied, limiting configuration-specific conclusions.
Mitigation direction
- Install a vendor-supported kernel containing the applicable cited stable fix.
- Check Linux distribution advisories for corrected package versions and reboot requirements.
- Restrict unnecessary local accounts and workloads until affected kernels are updated.
- Disable unused ALSA OSS compatibility functionality if vendor guidance supports doing so.
Validation and detection
- Record running kernel versions across Linux endpoints and compare them with vendor advisories.
- Verify whether ALSA OSS mixer compatibility is enabled or used on each system.
- Confirm installed kernel sources or packages include the applicable cited fix commit.
- After updating, verify the corrected kernel is running following any required reboot.
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.
CVE-2026-43126 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.
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:H/I:H/A:H1.85.9LinuxVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/ae583f113d15fa97e5234133c20d09f8e6214e47CVE reference, Linux
- https://git.kernel.org/stable/c/e6645e625480cdf1079a4265f758d13b70721029CVE reference, Linux
- https://git.kernel.org/stable/c/8c097cf736993454acf3f711a3b376d6c7ad8965CVE reference, Linux
- https://git.kernel.org/stable/c/084d5d44418148662365eced3e126ad1a81ee3e2CVE 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.