Security readout for executives and security teams
Plain-English summary
This Linux kernel issue can crash affected ARM systems during forced reboot when device traffic is still in flight. The business impact is availability: remote edge, appliance, or embedded systems may fail during restart and require intervention.
Executive priority
Prioritize for embedded, edge, telecom, or appliance fleets where failed remote reboots create outage or truck-roll risk. Generic non-ARM systems are unlikely to be exposed based on the provided sources.
Technical view
The ARM SMMU shutdown path unregisters IOMMU state while DMA mappings may still be used. During `reboot -f`, packet transmission can call IOMMU DMA map or unmap routines after shutdown cleanup, causing a NULL pointer dereference and kernel panic.
Likely exposure
Exposure appears limited to Linux kernels identified in the CVE source on ARM SMMU platforms, especially systems using affected DMA-capable devices during forced shutdown or reboot.
Exploitation context
The sources describe reproducible crashes during ping flood plus `reboot -f`. They do not show KEV listing, public exploitation, privilege requirements, or a general remote attack path.
Researcher notes
Evidence supports an availability bug in ARM SMMU shutdown ordering. The CVE data has no CVSS, CWE, or KEV signal, and the source bundle does not establish broader exploitability beyond the described forced reboot race.
Mitigation direction
- Update to a kernel containing the referenced stable fixes or your vendor's backport.
- Check Linux distribution or device-vendor guidance for affected kernel builds.
- Avoid forced reboot on affected ARM SMMU systems while traffic is active.
- Drain or stop network and DMA-heavy workloads before emergency reboot where feasible.
- Do not change SMMU bypass settings unless vendor guidance explicitly recommends it.
Validation and detection
- Inventory ARM systems using Linux 6.1-era kernels and ARM SMMU.
- Check kernel changelogs for the referenced stable commits.
- Review shutdown logs for `iommu_get_dma_domain` NULL pointer dereferences.
- Confirm reboot procedures do not rely on `reboot -f` under active traffic.
- Test remediation in a lab using vendor-supported kernels only.
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-2022-48895 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.
SSVC decision data
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/a1b9c7b1978aacf4b2f33e34bde1e2bb80b8497aCVE reference, Linux
- https://git.kernel.org/stable/c/ce31e6ca68bd7639bd3e5ef97be215031842bbabCVE 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.