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CVE Record

CVE-2024-43868: riscv/purgatory: align riscv_kernel_entry

In the Linux kernel, the following vulnerability has been resolved: riscv/purgatory: align riscv_kernel_entry When alignment handling is delegated to the kernel, everything must be word-aligned in purgatory, since the trap handler is then set to the kexec one. Without the alignment, hitting the exception would ultimately crash. On other occasions, the kernel's handler would take care of exceptions. This has been tested on a JH7110 SoC with oreboot and its SBI delegating unaligned access exceptions and the kernel configured to handle them.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel reliability flaw affecting specific RISC-V kexec conditions. If purgatory code is not word-aligned and unaligned-access handling is delegated to the kernel, an exception can lead to a crash during the kexec path.

Executive priority

Treat this as a targeted kernel reliability update, not an emergency internet-facing issue based on the provided evidence. Patch affected RISC-V systems during normal security maintenance, with higher priority for kexec-dependent operational or recovery workflows.

Technical view

The fix aligns riscv_kernel_entry in RISC-V purgatory. The source says unaligned exceptions can crash because the trap handler is the kexec one, not the normal kernel exception handler. The issue was tested on JH7110 with oreboot/SBI delegating unaligned access exceptions.

Likely exposure

Exposure appears limited to Linux on RISC-V, especially systems using kexec where firmware/SBI delegates unaligned access exceptions and the kernel handles them. The source bundle lists affected Linux kernel versions and stable commits but does not provide CVSS, CWE, or broad exploitability detail.

Exploitation context

No active exploitation is indicated. The CVE is not marked KEV, and the provided sources do not describe public exploitation, remote reachability, privilege requirements, or weaponization. The documented impact is a crash in a specific RISC-V kexec/purgatory condition.

Researcher notes

The evidence supports a narrow architecture-specific kernel bug. The crash path depends on purgatory alignment and exception delegation behavior. The bundle does not establish privilege boundary impact, remote attack surface, exploit status, or a standalone workaround beyond applying fixed kernel code.

Mitigation direction

  • Apply the relevant upstream Linux stable fix or downstream vendor kernel update for affected RISC-V builds.
  • For Debian LTS systems, review and apply the referenced Debian kernel security update.
  • Prioritize systems that use kexec on RISC-V hardware with delegated unaligned-access exceptions.
  • If no vendor package is available, track the linked stable kernel commits for backport status.

Validation and detection

  • Inventory RISC-V Linux systems and record kernel versions and vendor package status.
  • Check whether deployed kernels include one of the linked stable fixes.
  • Identify systems using kexec or crash-kernel workflows on RISC-V platforms.
  • Confirm firmware/SBI behavior for unaligned-access exception delegation where operationally relevant.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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

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CVE-2024-43868 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
3Timeline events
2ADP providers
6Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux736e30af583fb6e0e2b8211b894ff99dea0f1ee7, 736e30af583fb6e0e2b8211b894ff99dea0f1ee7, 736e30af583fb6e0e2b8211b894ff99dea0f1ee7, 736e30af583fb6e0e2b8211b894ff99dea0f1ee7unaffected
LinuxLinux5.19, 0, 6.1.117, 6.6.61, 6.10.4, 6.11affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.