CVE-2026-63830 remediation guide

Linux

In the Linux kernel, the following vulnerability has been resolved: net: skmsg: preserve sg.copy across SG transforms The sk_msg sg.copy bitmap is part of the scatterlist entry ownership state. A set bit tells sk_msg_compute_data_pointers() not to expose the entry through writable BPF ctx->data. This protects entries backed by pages that are not private to the sk_msg, such as splice-backed file page-cache pages. Several sk_msg transform paths move, copy, split, or compact msg->sg.data[] entries without moving the matching sg.copy bit. This can make an externally backed entry arrive at a new...

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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>= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < f126eed589eec6f201405abbc398844042ef6d57, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < 31a110642b5fb5e61940cbcfb503445ac4f28017, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < 9bb86d8184b37503816150c4a6ad3c17dfdbe827, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < 0eb4c16c4adb262763bda870a8ed38a1a9dec7ec, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < d22cc92bc41290e5783a72375e0843d9435f6001, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < 1acdd14c0990dd1cd4b6534f00366d2e6dfce05f, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < 21ed9540a8e1906dfcbc1bb82ba9b4de4fa4bd6d, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < 406e8a651a7b854c41fecd5117bb282b3a6c2c6b, >= 4.20

Fixed versionsNo verified fixed-version field is available yet

Priority basisReview · CVSS 9.4 · 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: >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < f126eed589eec6f201405abbc398844042ef6d57, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < 31a110642b5fb5e61940cbcfb503445ac4f28017, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < 9bb86d8184b37503816150c4a6ad3c17dfdbe827, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < 0eb4c16c4adb262763bda870a8ed38a1a9dec7ec, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < d22cc92bc41290e5783a72375e0843d9435f6001, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < 1acdd14c0990dd1cd4b6534f00366d2e6dfce05f, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < 21ed9540a8e1906dfcbc1bb82ba9b4de4fa4bd6d, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < 406e8a651a7b854c41fecd5117bb282b3a6c2c6b, >= 4.20. 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.