# net: skmsg: preserve sg.copy across SG transforms

CVE record · `CVE-2026-63830`

- **Identifiers:** `CVE-2026-63830`
- **State:** Confirmed
- **Severity:** CVSS 9.4 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** Linux
- **Weakness (CWE):** [CWE-269](https://cwe.mitre.org/data/definitions/269.html)
- **Tags:** [Privilege escalation](https://agentprime.io/advisories/tag/privilege-escalation.md)
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 19 Jul 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 19 Jul 2026, 12:02 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Critical

Critical, because:

- CVSS score 9.4: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `d3b18ad31f93d0b6bae105c679018a1ba7daa9ca to before f126eed589eec6f201405abbc398844042ef6d57` (git)
  - affected: `d3b18ad31f93d0b6bae105c679018a1ba7daa9ca to before 31a110642b5fb5e61940cbcfb503445ac4f28017` (git)
  - affected: `d3b18ad31f93d0b6bae105c679018a1ba7daa9ca to before 9bb86d8184b37503816150c4a6ad3c17dfdbe827` (git)
  - affected: `d3b18ad31f93d0b6bae105c679018a1ba7daa9ca to before 0eb4c16c4adb262763bda870a8ed38a1a9dec7ec` (git)
  - affected: `d3b18ad31f93d0b6bae105c679018a1ba7daa9ca to before d22cc92bc41290e5783a72375e0843d9435f6001` (git)
  - affected: `d3b18ad31f93d0b6bae105c679018a1ba7daa9ca to before 1acdd14c0990dd1cd4b6534f00366d2e6dfce05f` (git)
  - affected: `d3b18ad31f93d0b6bae105c679018a1ba7daa9ca to before 21ed9540a8e1906dfcbc1bb82ba9b4de4fa4bd6d` (git)
  - affected: `d3b18ad31f93d0b6bae105c679018a1ba7daa9ca to before 406e8a651a7b854c41fecd5117bb282b3a6c2c6b` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.20`
  - unaffected: `before 4.20` (semver)
  - unaffected: `5.10.261 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.212 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.177 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.144 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.95 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.38 to 6.18.*, inclusive` (semver)
  - unaffected: `7.1.3 to 7.1.*, inclusive` (semver)
  - unaffected: `7.2 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 9.4 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0044, the 38th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 19 Jul 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-63830](https://www.cve.org/CVERecord?id=CVE-2026-63830)
- [NVD: CVE-2026-63830](https://nvd.nist.gov/vuln/detail/CVE-2026-63830)

### References from the CNA

- <https://git.kernel.org/stable/c/f126eed589eec6f201405abbc398844042ef6d57>
- <https://git.kernel.org/stable/c/31a110642b5fb5e61940cbcfb503445ac4f28017>
- <https://git.kernel.org/stable/c/9bb86d8184b37503816150c4a6ad3c17dfdbe827>
- <https://git.kernel.org/stable/c/0eb4c16c4adb262763bda870a8ed38a1a9dec7ec>
- <https://git.kernel.org/stable/c/d22cc92bc41290e5783a72375e0843d9435f6001>
- <https://git.kernel.org/stable/c/1acdd14c0990dd1cd4b6534f00366d2e6dfce05f>
- <https://git.kernel.org/stable/c/21ed9540a8e1906dfcbc1bb82ba9b4de4fa4bd6d>
- <https://git.kernel.org/stable/c/406e8a651a7b854c41fecd5117bb282b3a6c2c6b>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-63830>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-63830/>. Everything for agents: <https://agentprime.io/llms.txt>.