Security readout for executives and security teams
Plain-English summary
CVE-2022-48845 is a Linux kernel MIPS scheduling initialization bug. Some MIPS systems could start secondary CPUs before sibling and core CPU maps were populated, triggering scheduler warnings and potentially incorrect core-scheduling setup. The sources do not describe remote exploitation, privilege escalation, data theft, or service impact.
Executive priority
Treat this as a targeted platform maintenance issue, not an internet-wide emergency based on current evidence. Prioritize organizations operating MIPS-based appliances, embedded systems, or custom kernels, especially where vendor firmware updates lag.
Technical view
On MIPS, set_cpu_sibling_map() ran after notify_cpu_starting(), while sched_core_cpu_starting() needed cpu_sibling_map during CPU hotplug startup. With CONFIG_SCHED_CORE, affected systems could enter the scheduler callback with an empty SMT mask. The fix moves sibling/core map population earlier, after delay calibration and before CPU hotplug callbacks.
Likely exposure
Exposure appears limited to Linux kernel deployments on MIPS, especially SMP/SMT systems using CONFIG_SCHED_CORE. The bundle lists Linux 2.6.28 through 5.17-era affected version ranges and several stable kernel fix commits. Non-MIPS systems are not identified as affected in the supplied sources.
Exploitation context
No active exploitation is identified. The record is not in KEV, has no CVSS score, and the public description centers on boot-time scheduler warnings and incorrect initialization ordering. The supplied evidence does not establish a practical exploit path or attacker prerequisites.
Researcher notes
The useful research question is operational impact, not weaponization. Sources show a scheduler initialization ordering defect and stable backports, but do not document security impact beyond incorrect core-scheduling setup. Validate architecture, config, and patch presence before assigning urgency.
Mitigation direction
- Check vendor or distribution advisories for kernels containing the referenced stable fixes.
- Prioritize MIPS SMP/SMT systems running CONFIG_SCHED_CORE or affected kernel ranges.
- Upgrade to a maintained kernel release that includes the MIPS sibling/core map timing fix.
- For embedded appliances, request firmware status from the device vendor.
Validation and detection
- Inventory Linux kernel versions and CPU architecture on exposed systems.
- Confirm whether deployed kernels include one of the referenced stable commits.
- Review boot logs for sched_core_cpu_starting warnings on MIPS systems.
- Check kernel configuration for CONFIG_SCHED_CORE on MIPS builds.
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-2022-48845 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/7315f8538db009605ffba00370678142ef00ac98CVE reference, Linux
- https://git.kernel.org/stable/c/32813321f18d5432cec1b1a6ecc964f9ea26d565CVE reference, Linux
- https://git.kernel.org/stable/c/56eaacb8137ba2071ce48d4e3d91979270e139a7CVE reference, Linux
- https://git.kernel.org/stable/c/c2420bc3333111184cdcb112282d13afe1338dd7CVE reference, Linux
- https://git.kernel.org/stable/c/e8ad9ecc406974deb5e7c070f51cc1d09d21dc4bCVE reference, Linux
- https://git.kernel.org/stable/c/be538b764a46be1d0700fd3b6e82fb76bd17f13aCVE reference, Linux
- https://git.kernel.org/stable/c/94647aec80d03d6914aa664b7b8e103cd9d63239CVE reference, Linux
- https://git.kernel.org/stable/c/f2703def339c793674010cc9f01bfe4980231808CVE 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.