# ip6mr: do not clone dst in ip6mr_cache_report()

CVE record · `CVE-2026-90111`

- **Identifiers:** `CVE-2026-90111`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 17 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 17 Sept 2026, 16:06 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: `67f415dd29063a5906c560051c00e42dcf01a4dd to before b50d3cfb8513e895cee453dd0f834deee6ccc231` (git)
  - affected: `67f415dd29063a5906c560051c00e42dcf01a4dd to before 7f8287f606c8c028d4224e85d95dc448c6d6d623` (git)
  - affected: `67f415dd29063a5906c560051c00e42dcf01a4dd to before 42ef371466d5648f5c9e8bc219f0af0a2c2bbf8c` (git)
  - affected: `67f415dd29063a5906c560051c00e42dcf01a4dd to before f57b0fd1c62e1be274ee154ab7fb8ac4481b7f89` (git)
  - affected: `67f415dd29063a5906c560051c00e42dcf01a4dd to before 4a674afaae4136c71943aa3e35d433676fd40e8f` (git)
  - affected: `67f415dd29063a5906c560051c00e42dcf01a4dd to before 235b42b5860189eb8c27c36435ad932cae65a734` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.3`
  - unaffected: `before 5.3` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.114 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.57 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.6 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> The Linux kernel IPv6 multicast routing code (ip6mr) is affected from version 5.3 until fixed. A reference to a freed route entry can be used after it is freed, causing a slab use-after-free. The source gives few details on what an attacker needs to trigger it. Upgrade to 6.1.191, 6.6.160, 6.12.114 or 6.18.57, or a later release in those series.

Written 12 Nov 2026.

## 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)

- **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 17 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-90111](https://www.cve.org/CVERecord?id=CVE-2026-90111)
- [NVD: CVE-2026-90111](https://nvd.nist.gov/vuln/detail/CVE-2026-90111)

### References from the CNA

- <https://git.kernel.org/stable/c/b50d3cfb8513e895cee453dd0f834deee6ccc231>
- <https://git.kernel.org/stable/c/7f8287f606c8c028d4224e85d95dc448c6d6d623>
- <https://git.kernel.org/stable/c/42ef371466d5648f5c9e8bc219f0af0a2c2bbf8c>
- <https://git.kernel.org/stable/c/f57b0fd1c62e1be274ee154ab7fb8ac4481b7f89>
- <https://git.kernel.org/stable/c/4a674afaae4136c71943aa3e35d433676fd40e8f>
- <https://git.kernel.org/stable/c/235b42b5860189eb8c27c36435ad932cae65a734>

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-2026-90111>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90111/>. Everything for agents: <https://agentprime.io/llms.txt>.