# ipv4: udp: Create exceptions before socket matching

CVE record · `CVE-2026-99077`

- **Identifiers:** `CVE-2026-99077`
- **State:** Confirmed
- **Severity:** CVSS 7.4 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 23 Oct 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 23 Oct 2026, 12:23 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: `4895c771c7f006b4b90f9d6b1d2210939ba57b38 to before e8f211a37396f1684af9ac81b3fc53538eb9c2f7` (git)
  - affected: `4895c771c7f006b4b90f9d6b1d2210939ba57b38 to before 9f97b01ee799bdf57d9183623f3987c8bbfd4f6f` (git)
  - affected: `4895c771c7f006b4b90f9d6b1d2210939ba57b38 to before e0cd4942831d4ef8f6d4b90b0d3510460fdfbceb` (git)
  - affected: `4895c771c7f006b4b90f9d6b1d2210939ba57b38 to before 0cf0ff2f728f2a1434c56c0bcf267fe230abf124` (git)
  - affected: `4895c771c7f006b4b90f9d6b1d2210939ba57b38 to before 3b92e4349c6b0dd1e05d5f0483e71ef37691b1c3` (git)
  - affected: `4895c771c7f006b4b90f9d6b1d2210939ba57b38 to before ecd7ead4bf05e221e90f18a29aec570a50fd1592` (git)
  - affected: `4895c771c7f006b4b90f9d6b1d2210939ba57b38 to before be4fd05398f2b5e42029be70ee875fc749b8ce3a` (git)
  - affected: `4895c771c7f006b4b90f9d6b1d2210939ba57b38 to before 4c3499f79f8c7e8561266bcc220a18538cec0458` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `3.6`
  - unaffected: `before 3.6` (semver)
  - unaffected: `5.10.273 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.224 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.161 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.115 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.59 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0043, the 37th 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 Oct 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-99077](https://www.cve.org/CVERecord?id=CVE-2026-99077)
- [NVD: CVE-2026-99077](https://nvd.nist.gov/vuln/detail/CVE-2026-99077)

### References from the CNA

- <https://git.kernel.org/stable/c/e8f211a37396f1684af9ac81b3fc53538eb9c2f7>
- <https://git.kernel.org/stable/c/9f97b01ee799bdf57d9183623f3987c8bbfd4f6f>
- <https://git.kernel.org/stable/c/e0cd4942831d4ef8f6d4b90b0d3510460fdfbceb>
- <https://git.kernel.org/stable/c/0cf0ff2f728f2a1434c56c0bcf267fe230abf124>
- <https://git.kernel.org/stable/c/3b92e4349c6b0dd1e05d5f0483e71ef37691b1c3>
- <https://git.kernel.org/stable/c/ecd7ead4bf05e221e90f18a29aec570a50fd1592>
- <https://git.kernel.org/stable/c/be4fd05398f2b5e42029be70ee875fc749b8ce3a>
- <https://git.kernel.org/stable/c/4c3499f79f8c7e8561266bcc220a18538cec0458>

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-2026-99077>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-99077/>. Everything for agents: <https://agentprime.io/llms.txt>.