Security readout for executives and security teams
Plain-English summary
This is a Linux kernel reliability flaw in the HiSilicon PCIe PMU performance-monitoring driver. During CPU shutdown, the driver can move performance state back onto the CPU being removed, causing a blocked kernel CPU hotplug thread. The documented impact is system availability, not data theft or privilege escalation.
Executive priority
Treat this as a targeted kernel availability issue. It is not currently evidenced as internet-exploited, but affected production systems using HiSilicon PMU hardware should receive normal kernel patching priority, with higher urgency for environments that offline CPUs or rely on uptime during hardware maintenance.
Technical view
The hisi_pcie_pmu CPU teardown callback uses the online CPU mask before it reflects the CPU being removed. That can select the teardown CPU as the migration target for perf context and block in perf_pmu_migrate_context. The fix uses cpumask_any_but() to select a different active CPU.
Likely exposure
Likely limited to Linux systems using the affected HiSilicon PCIe PMU perf driver, especially where CPU hotplug, CPU offlining, suspend, maintenance, or topology changes occur. The bundle lists Linux versions and stable commit references but does not identify distributions or hardware SKUs.
Exploitation context
The source bundle does not report active exploitation, and KEV is false. No remote attack path is described. The evidence points to a local or operational availability issue triggered around CPU teardown behavior on affected kernel and driver combinations.
Researcher notes
The CVE record provides no CVSS, CWE, proof of exploitation, or distro-specific affected matrix. Analysis should stay tied to the hisi_pcie_pmu teardown migration bug and stable kernel patches. Avoid broad Linux exposure claims without confirming hardware, driver presence, and backported fixes.
Mitigation direction
- Apply kernel or distribution updates containing the referenced stable fixes.
- Check vendor or distribution guidance for affected package versions and backports.
- Prioritize systems with HiSilicon PCIe PMU hardware and CPU hotplug usage.
- Avoid unsupported kernel workarounds unless vendor guidance recommends them.
- Track this as availability risk where CPU offlining is operationally common.
Validation and detection
- Inventory Linux kernel versions against vendor advisories and linked stable commits.
- Confirm whether the HiSilicon PCIe PMU driver is present or loaded.
- Review kernel logs for hisi_pcie_pmu_offline_cpu and perf_pmu_migrate_context call traces.
- Verify patched systems include the cpumask_any_but() migration fix.
- Document any CPU hotplug, suspend, or maintenance workflows on exposed systems.
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-2023-53656 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.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/be9c8c9c84b6d25a7b7d39954030aba6f759feb6CVE reference, Linux
- https://git.kernel.org/stable/c/f564e543a43d0f1cabac791672c8a6fc78ce12d0CVE reference, Linux
- https://git.kernel.org/stable/c/b64569897d86b611befbb895d815280fea94e1edCVE reference, Linux
- https://git.kernel.org/stable/c/7a6a9f1c5a0a875a421db798d4b2ee022dc1ee1aCVE 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.