Security readout for executives and security teams
Plain-English summary
CVE-2025-21941 is a Linux kernel availability bug in the AMD display driver. A local low-privileged user could potentially trigger a null pointer dereference and crash the system. The issue was found by code review, and the provided sources do not show active exploitation.
Executive priority
Treat as a routine but time-bound kernel availability fix. It is not currently supported by sources as actively exploited, but systems with shared local access or business-critical graphical workloads should be patched promptly to reduce crash risk.
Technical view
The flaw is CWE-476 in drm/amd/display resource_build_scaling_params. The code could access pipe_ctx->plane_state when it was null. Kernel stable fixes add a null check before use. CVSS 3.1 is 5.5: local attack vector, low complexity, low privileges, no user interaction, high availability impact only.
Likely exposure
Exposure is most likely on affected Linux kernels using the AMD DRM/display stack. Desktop, workstation, VDI, and GPU-enabled systems with local users are more relevant than headless servers without AMD display functionality. Exact exposure depends on kernel version, distro backports, and enabled drivers.
Exploitation context
The source bundle marks KEV as false and cites no public exploitation. The CVSS vector requires local access with low privileges. Impact is denial of service rather than data theft or privilege escalation, based on the provided scoring and description.
Researcher notes
The evidence supports a local denial-of-service assessment only. The affected version data in the bundle is kernel-oriented and may require distro mapping. Validate against downstream package advisories because vendors often backport fixes without changing upstream version numbers.
Mitigation direction
- Update to a vendor kernel containing the referenced stable fixes.
- Apply Debian LTS kernel updates where those advisories apply.
- Prioritize systems with AMD graphics and untrusted local users.
- Reboot after kernel updates so the fixed kernel is running.
- Check vendor guidance for exact fixed package versions.
Validation and detection
- Inventory running kernel versions across Linux endpoints and servers.
- Confirm whether AMD DRM/display drivers are present and enabled.
- Compare installed kernels against vendor advisories and stable fix references.
- Verify the active booted kernel changed after patching.
- Review kernel logs for related AMD display null dereference crashes.
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-476: 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-2025-21941 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/265422915416468ba91bffa56addbff45e18342aCVE reference, Linux
- https://git.kernel.org/stable/c/f435192e00bc4d5d4134356b93212670ec47fa8dCVE reference, Linux
- https://git.kernel.org/stable/c/c1e54752dc12e90305eb0475ca908f42f5b369caCVE reference, Linux
- https://git.kernel.org/stable/c/3b3c2be58d5275aa59d8b4810a59f173f2f5bac1CVE reference, Linux
- https://git.kernel.org/stable/c/e0345c3478f185ca840daac7f08a1fcd4ebec3e9CVE reference, Linux
- https://git.kernel.org/stable/c/3748fad09d89e9a5290e1738fd6872a79f794743CVE reference, Linux
- https://git.kernel.org/stable/c/374c9faac5a763a05bc3f68ad9f73dab3c6aec90CVE reference, Linux
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.htmlCVE reference, CVE
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.htmlCVE reference, CVE
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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.