Security readout for executives and security teams
Plain-English summary
This is a Linux kernel stability flaw in the OMAP framebuffer LCD DMA path. On affected hardware, using touchscreen and framebuffer together can crash the system. The public record does not show code execution, data theft, or active exploitation, but reliability impact may matter for embedded or operational devices.
Executive priority
Treat as low general enterprise priority, but moderate for owners of affected embedded Linux hardware where device crashes disrupt service, safety workflows, or field operations.
Technical view
The kernel report shows an interrupt handler reaching clock operations that can sleep, causing a scheduling-while-atomic BUG. The resolved change moves OMAP LCD DMA interrupt handling to a threaded IRQ. Evidence points to the fbdev OMAP path, with the Nokia 770 cited as the observed crashing platform.
Likely exposure
Likely limited to Linux systems using the OMAP framebuffer LCD DMA driver, especially embedded ARM devices with touchscreen plus framebuffer. Typical servers, desktops, and cloud workloads are unlikely to expose this path unless they use the affected OMAP display stack.
Exploitation context
No KEV listing is provided, and the source bundle does not cite active exploitation. The described trigger is local hardware and driver interaction causing a crash. Public evidence supports denial of service or instability, not remote compromise.
Researcher notes
The evidence is narrow and hardware-specific. The bundle has no CVSS, CWE, exploit report, or detailed version mapping beyond Linux affected entries and stable commits. Avoid broad claims about all Linux systems; focus validation on OMAP fbdev LCD DMA deployments.
Mitigation direction
- Update to a vendor kernel containing the OMAP fbdev LCD DMA threaded IRQ fix.
- Apply the relevant kernel.org stable commit for the deployed kernel branch.
- Use Debian LTS kernel updates where applicable to Debian systems.
- Prioritize embedded devices using OMAP framebuffer, LCD DMA, and touchscreen input.
- If no package exists, track vendor guidance and plan a kernel maintenance update.
Validation and detection
- Inventory devices for OMAP fbdev framebuffer and LCD DMA usage.
- Check deployed kernel versions against vendor advisories and stable branch fixes.
- Review crash logs for scheduling-while-atomic BUG traces in OMAP LCD DMA paths.
- Confirm updated kernels include the threaded IRQ change for this driver.
- Regression-test touchscreen and framebuffer operation on affected hardware after updating.
Public sources used
- CVE Program
- CVE List V5
- Kernel stable commit 7bbbd311dd503653a2cc86d9226740883051dc92
- Kernel stable commit fb6a5edb60921887d7d10619fcdcbee9759552cb
- Kernel stable commit aa8e22cbedeb626f2a6bda0aea362353d627cd0a
- Kernel stable commit 8392ea100f0b86c234c739c6662f39f0ccc0cefd
- Kernel stable commit e4b6b665df815b4841e71b72f06446884e8aad40
- Debian LTS announcement
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-2025-21821 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
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/7bbbd311dd503653a2cc86d9226740883051dc92CVE reference, Linux
- https://git.kernel.org/stable/c/fb6a5edb60921887d7d10619fcdcbee9759552cbCVE reference, Linux
- https://git.kernel.org/stable/c/aa8e22cbedeb626f2a6bda0aea362353d627cd0aCVE reference, Linux
- https://git.kernel.org/stable/c/8392ea100f0b86c234c739c6662f39f0ccc0cefdCVE reference, Linux
- https://git.kernel.org/stable/c/e4b6b665df815b4841e71b72f06446884e8aad40CVE reference, Linux
- https://lists.debian.org/debian-lts-announce/2025/03/msg00028.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.