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Review reviewCritical

CVE-2026-63830

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...

CVSS
9.4
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.19
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 9.4

Vulnerability overview

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...

Affected product and versions

Product
Linux
Affected versions
>= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < f126eed589eec6f201405abbc398844042ef6d57, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < 31a110642b5fb5e61940cbcfb503445ac4f28017, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < 9bb86d8184b37503816150c4a6ad3c17dfdbe827, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < 0eb4c16c4adb262763bda870a8ed38a1a9dec7ec, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < d22cc92bc41290e5783a72375e0843d9435f6001, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < 1acdd14c0990dd1cd4b6534f00366d2e6dfce05f, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < 21ed9540a8e1906dfcbc1bb82ba9b4de4fa4bd6d, >= d3b18ad31f93d0b6bae105c679018a1ba7daa9ca < 406e8a651a7b854c41fecd5117bb282b3a6c2c6b, >= 4.20
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
CWE
Not available