# net: skbuff: preserve shared-frag marker during coalescing

CVE record · `CVE-2026-46300`

- **Identifiers:** `CVE-2026-46300`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** Yes: KEV, CVSS 7+ and EPSS
- **CNA:** Linux
- **Weakness (CWE):** [CWE-123](https://cwe.mitre.org/data/definitions/123.html) · [CWE-456](https://cwe.mitre.org/data/definitions/456.html)
- **Tags:** [CWE-123](https://agentprime.io/advisories/tag/cwe-123.md) · [CWE-456](https://agentprime.io/advisories/tag/cwe-456.md)
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 23 May 2026
- **Updated:** 29 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 23 May 2026, 11:44 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:

- In CISA’s KEV catalogue since 28 Oct 2026: it is known to be exploited.
- CVSS score 7.8 (7.0 or more) and EPSS 0.16 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

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

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `cef401de7be8c4e155c6746bfccf721a4fa5fab9 to before 3599e6b3cc1ada96883d496a50a210d3afbb6987` (git)
  - affected: `cef401de7be8c4e155c6746bfccf721a4fa5fab9 to before 2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c` (git)
  - affected: `cef401de7be8c4e155c6746bfccf721a4fa5fab9 to before 9d3e5fd19fe1063bf607219e8562fbd567b8e8d5` (git)
  - affected: `cef401de7be8c4e155c6746bfccf721a4fa5fab9 to before 78bf6b6bb19541d19fbda6242e7cfe2c682763c0` (git)
  - affected: `cef401de7be8c4e155c6746bfccf721a4fa5fab9 to before 760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e` (git)
  - affected: `cef401de7be8c4e155c6746bfccf721a4fa5fab9 to before 3bd9e113d50034db99d7ef69fd8e5242d15e414a` (git)
  - affected: `cef401de7be8c4e155c6746bfccf721a4fa5fab9 to before 3884358a9286b17f389a72b1426fc4547c23c111` (git)
  - affected: `cef401de7be8c4e155c6746bfccf721a4fa5fab9 to before f84eca5817390257cef78013d0112481c503b4a3` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `3.9`
  - unaffected: `before 3.9` (semver)
  - unaffected: `5.10.257 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.208 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.174 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.141 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.91 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.33 to 6.18.*, inclusive` (semver)
  - unaffected: `7.0.10 to 7.0.*, inclusive` (semver)
  - unaffected: `7.1 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

- 7.8 High, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`, from CNA (Linux) (used for this record)
- 7.8 High, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`, from ADP (redhat-SADP)

- **CISA KEV:** Listed since 28 Oct 2026: known to be exploited.
- **EPSS:** 0.16, the 96th percentile, on 6 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 May 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-46300](https://www.cve.org/CVERecord?id=CVE-2026-46300)
- [NVD: CVE-2026-46300](https://nvd.nist.gov/vuln/detail/CVE-2026-46300)

### References from the CNA

- <https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987>
- <https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c>
- <https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5>
- <https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0>
- <https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e>
- <https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a>
- <https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111>
- <https://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3>

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-2026-46300>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-46300/>. Everything for agents: <https://agentprime.io/llms.txt>.