# net: skbuff: don't leave stale bytes in skb_copy_and_csum_bits()

CVE record · `CVE-2026-99030`

- **Identifiers:** `CVE-2026-99030`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 23 Oct 2026
- **Updated:** 24 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 23 Oct 2026, 12:21 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.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `65249feb6b3df9e17bab5911ee56fa7b0971e231 to before 5f19b9cfff79508e8cb09be40d014cb0807f3854` (git)
  - affected: `65249feb6b3df9e17bab5911ee56fa7b0971e231 to before 5551399751e2c9f31e4f3428040985a07e79d9c2` (git)
  - affected: `65249feb6b3df9e17bab5911ee56fa7b0971e231 to before 39d1a6b601831237c6038b5e3ac8dbb883c1700a` (git)
  - affected: `65249feb6b3df9e17bab5911ee56fa7b0971e231 to before ab9414ed70bd783e902a85c350620dee269bcb2b` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.12`
  - unaffected: `before 6.12` (semver)
  - unaffected: `6.12.113 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.57 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.11 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0046, the 39th percentile, on 5 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 23 Oct 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-99030](https://www.cve.org/CVERecord?id=CVE-2026-99030)
- [NVD: CVE-2026-99030](https://nvd.nist.gov/vuln/detail/CVE-2026-99030)

### References from the CNA

- <https://git.kernel.org/stable/c/5f19b9cfff79508e8cb09be40d014cb0807f3854>
- <https://git.kernel.org/stable/c/5551399751e2c9f31e4f3428040985a07e79d9c2>
- <https://git.kernel.org/stable/c/39d1a6b601831237c6038b5e3ac8dbb883c1700a>
- <https://git.kernel.org/stable/c/ab9414ed70bd783e902a85c350620dee269bcb2b>

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-2026-99030>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-99030/>. Everything for agents: <https://agentprime.io/llms.txt>.