# bpf, cgroup: Fix storage null-ptr-deref after replacing prog

CVE record · `CVE-2026-90250`

- **Identifiers:** `CVE-2026-90250`
- **State:** Confirmed
- **Severity:** No CVSS score
- **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, 16:07 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 85785e7e2ebddcaa5c3b31bd3bcd83ae648985d4` (git)
  - affected: `0c991ebc8c69d29b7fc44db17075c5aa5253e2ab to before 16c8321ee40c420f8e02e09515a5126682ddf4ea` (git)
  - affected: `0c991ebc8c69d29b7fc44db17075c5aa5253e2ab to before a033c950f6731be88a7da98604ed78f302f15b80` (git)
  - affected: `0c991ebc8c69d29b7fc44db17075c5aa5253e2ab to before 1ab3da12061d7ccb099f7e925fa2d865967a316a` (git)
  - affected: `0c991ebc8c69d29b7fc44db17075c5aa5253e2ab to before 12feca126831556dc7fabe5a3ba28fbd328768b6` (git)
  - affected: `0c991ebc8c69d29b7fc44db17075c5aa5253e2ab to before 3f562c537e9ecf4bc5e206cfffc2cc047f1b7e94` (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: `6.6.160 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's BPF cgroup code is affected from commit 0c991ebc8c69 up to the fixed commits listed for several stable branches, and from 5.7 in mainline (before the fix). The source describes a null pointer dereference that occurs when a cgroup BPF program is replaced by one using cgroup storage that was never allocated for it. The source does not describe the attacker's required privileges. Upgrade to a fixed kernel for your branch: 6.1.191 or later in the 6.1 series, 6.6.160 or later in 6.6, 6.12.110 or later in 6.12, or 6.18.52 or later in 6.18. No workaround is given.

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

No source has published a CVSS score for this record yet.

- **CISA KEV:** Not listed.
- **EPSS:** 0.0021, the 10th 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-2026-90250](https://www.cve.org/CVERecord?id=CVE-2026-90250)
- [NVD: CVE-2026-90250](https://nvd.nist.gov/vuln/detail/CVE-2026-90250)

### References from the CNA

- <https://git.kernel.org/stable/c/85785e7e2ebddcaa5c3b31bd3bcd83ae648985d4>
- <https://git.kernel.org/stable/c/16c8321ee40c420f8e02e09515a5126682ddf4ea>
- <https://git.kernel.org/stable/c/a033c950f6731be88a7da98604ed78f302f15b80>
- <https://git.kernel.org/stable/c/1ab3da12061d7ccb099f7e925fa2d865967a316a>
- <https://git.kernel.org/stable/c/12feca126831556dc7fabe5a3ba28fbd328768b6>
- <https://git.kernel.org/stable/c/3f562c537e9ecf4bc5e206cfffc2cc047f1b7e94>

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-2026-90250>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90250/>. Everything for agents: <https://agentprime.io/llms.txt>.