CVE-2025-40199 remediation guide

Linux

In the Linux kernel, the following vulnerability has been resolved: page_pool: Fix PP_MAGIC_MASK to avoid crashing on some 32-bit arches Helge reported that the introduction of PP_MAGIC_MASK let to crashes on boot on his 32-bit parisc machine. The cause of this is the mask is set too wide, so the page_pool_page_is_pp() incurs false positives which crashes the machine. Just disabling the check in page_pool_is_pp() will lead to the page_pool code itself malfunctioning; so instead of doing this, this patch changes the define for PP_DMA_INDEX_BITS to avoid mistaking arbitrary kernel pointers fo...

Open CVE record

Research in progress

A verified fixed-version field is not available. Use the linked NVD and supporting references, then confirm the vendor-supported path before changing production systems.

ProductLinux

Affected versions>= 4f51fb0d257ff4d406ec27966902de075e3b118e < 15b8a5b4cdc16e9a8bb2a548e12a0fd92997605a, >= ee62ce7a1d909ccba0399680a03c2dee83bcae95 < f62934cea32c8f7b11b747975d69bf5afe4264cf, >= ee62ce7a1d909ccba0399680a03c2dee83bcae95 < 95920c2ed02bde551ab654e9749c2ca7bc3100e0, >= c30ae60f41f9edd6e1b5cad41cf28ce04dae39e4, >= 6.12.34 < 6.12.54, >= 6.15.3 < 6.16, >= 6.16

Fixed versionsNo verified fixed-version field is available yet

Priority basisReview · CVSS 7.8 · EPSS -

Identify the affected asset

Confirm whether Linux is installed, record the deployed version and installation path, and identify exposed interfaces.

Record the product name, package or appliance identifier, and installed version.
Identify internet-facing, administrative, API, and internal access paths.
Preserve the pre-change configuration and relevant service logs.

Validate the affected-version match

Compare the deployed version with the affected range: >= 4f51fb0d257ff4d406ec27966902de075e3b118e < 15b8a5b4cdc16e9a8bb2a548e12a0fd92997605a, >= ee62ce7a1d909ccba0399680a03c2dee83bcae95 < f62934cea32c8f7b11b747975d69bf5afe4264cf, >= ee62ce7a1d909ccba0399680a03c2dee83bcae95 < 95920c2ed02bde551ab654e9749c2ca7bc3100e0, >= c30ae60f41f9edd6e1b5cad41cf28ce04dae39e4, >= 6.12.34 < 6.12.54, >= 6.15.3 < 6.16, >= 6.16. Treat incomplete inventory results as unresolved.

Prioritize with independent signals

The CVSS severity warrants an early asset and exposure review. Combine this signal with asset criticality, exposure, compensating controls, and business impact.

Apply supported remediation

Follow the vendor advisory or supported update path. Current fixed-version status: No verified fixed-version field is available yet. Preserve configuration and rollback material before change.

Verify the result

Confirm the resulting version, service health, authentication and access paths, monitoring coverage, and relevant security logs.

Confirm the expected version and package state.
Run a functional health check for critical service paths.
Review authentication, error, application, and security monitoring logs.
Reassess exposure if the supported fix cannot be applied.

Operational boundary

This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.