# bpf: Fix potential UAF when reading bpf link info

CVE record · `CVE-2026-90392`

- **Identifiers:** `CVE-2026-90392`
- **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, 16:09 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: `0c991ebc8c69d29b7fc44db17075c5aa5253e2ab to before 4c8432a332d4a24dc2742f56062a53d8fad36f53` (git)
  - affected: `0c991ebc8c69d29b7fc44db17075c5aa5253e2ab to before a5c936ac904767fc1d943d40b0308bcb2ae2509b` (git)
  - affected: `0c991ebc8c69d29b7fc44db17075c5aa5253e2ab to before d7d7208e2603b45724b684f4df73904fb347741e` (git)
  - affected: `0c991ebc8c69d29b7fc44db17075c5aa5253e2ab to before 85cf991c881e7198be32be05a9daa2625390c8b3` (git)
  - affected: `0c991ebc8c69d29b7fc44db17075c5aa5253e2ab to before 79347e42cfbc9e78872922e8f08a70609c9af82f` (git)
  - affected: `0c991ebc8c69d29b7fc44db17075c5aa5253e2ab to before 863f3ddd0b8ac65abfb50d3be0869268ac0e277b` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.7`
  - unaffected: `before 5.7` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.110 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.52 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 BPF subsystem is affected from version 5.7 until the fixed releases listed in the source. A concurrent program replacement can free the old program while bpf link information is being read, causing a use-after-free, but the source does not say who can trigger this. Upgrade to a fixed kernel: 6.1.191 or later in the 6.1 series, 6.6.157 or later in 6.6, 6.12.110 or later in 6.12, or 6.18.52 or later in 6.18.

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-2026-90392](https://www.cve.org/CVERecord?id=CVE-2026-90392)
- [NVD: CVE-2026-90392](https://nvd.nist.gov/vuln/detail/CVE-2026-90392)

### References from the CNA

- <https://git.kernel.org/stable/c/4c8432a332d4a24dc2742f56062a53d8fad36f53>
- <https://git.kernel.org/stable/c/a5c936ac904767fc1d943d40b0308bcb2ae2509b>
- <https://git.kernel.org/stable/c/d7d7208e2603b45724b684f4df73904fb347741e>
- <https://git.kernel.org/stable/c/85cf991c881e7198be32be05a9daa2625390c8b3>
- <https://git.kernel.org/stable/c/79347e42cfbc9e78872922e8f08a70609c9af82f>
- <https://git.kernel.org/stable/c/863f3ddd0b8ac65abfb50d3be0869268ac0e277b>

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-2026-90392>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90392/>. Everything for agents: <https://agentprime.io/llms.txt>.