# net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy()

CVE record · `CVE-2026-90049`

- **Identifiers:** `CVE-2026-90049`
- **State:** Confirmed
- **Severity:** CVSS 9.3 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 16 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 16 Sept 2026, 10:33 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 9.3: 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: `36d5fe6a000790f56039afe26834265db0a3ad4c to before 849bdb83123760a865bcb2970127f4c0b9423ba3` (git)
  - affected: `36d5fe6a000790f56039afe26834265db0a3ad4c to before fb10e0e9b220a2eed08931a60dbaad9a2370c908` (git)
  - affected: `36d5fe6a000790f56039afe26834265db0a3ad4c to before 767ec2a65cc022d303b0c9c12811e7db22057341` (git)
  - affected: `36d5fe6a000790f56039afe26834265db0a3ad4c to before 8069643ae64dfdf634b6c78c7f622e5323031436` (git)
  - affected: `36d5fe6a000790f56039afe26834265db0a3ad4c to before 04dd250a78e268af3e7124beb1dc10ec1dd88d60` (git)
  - affected: `36d5fe6a000790f56039afe26834265db0a3ad4c to before a13b1e80e5015cd732440b475c0ef443dc4a2157` (git)
  - affected: `36d5fe6a000790f56039afe26834265db0a3ad4c to before bab5a851e44a3601d31f2aa8043f385bb50ac5d9` (git)
  - affected: `36d5fe6a000790f56039afe26834265db0a3ad4c to before 8ece906150128d5ec2462aabcc978c568433eca4` (git)
  - affected: `c5f0c0e7525443add533495e93ba8de6feab2396` (git)
  - affected: `1674b4bf3eea3cac51b70778e89f8025f7cfe695` (git)
  - affected: `3.10.51 to before 3.11` (semver)
  - affected: `3.12.40 to before 3.13` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `3.14`
  - unaffected: `before 3.14` (semver)
  - unaffected: `5.10.270 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.221 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.188 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.110 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.51 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.5 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0017, the 6th percentile, on 13 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 16 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-90049](https://www.cve.org/CVERecord?id=CVE-2026-90049)
- [NVD: CVE-2026-90049](https://nvd.nist.gov/vuln/detail/CVE-2026-90049)

### References from the CNA

- <https://git.kernel.org/stable/c/849bdb83123760a865bcb2970127f4c0b9423ba3>
- <https://git.kernel.org/stable/c/fb10e0e9b220a2eed08931a60dbaad9a2370c908>
- <https://git.kernel.org/stable/c/767ec2a65cc022d303b0c9c12811e7db22057341>
- <https://git.kernel.org/stable/c/8069643ae64dfdf634b6c78c7f622e5323031436>
- <https://git.kernel.org/stable/c/04dd250a78e268af3e7124beb1dc10ec1dd88d60>
- <https://git.kernel.org/stable/c/a13b1e80e5015cd732440b475c0ef443dc4a2157>
- <https://git.kernel.org/stable/c/bab5a851e44a3601d31f2aa8043f385bb50ac5d9>
- <https://git.kernel.org/stable/c/8ece906150128d5ec2462aabcc978c568433eca4>

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-2026-90049>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90049/>. Everything for agents: <https://agentprime.io/llms.txt>.