# bpf: Reject negative optlen in cgroup getsockopt hook

CVE record · `CVE-2026-90157`

- **Identifiers:** `CVE-2026-90157`
- **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:** 19 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: `08f61a34913558e06576e7b6318bf583f273c1be to before 5b09d984b38b018b123c3a9e02a96bbc6468dbe5` (git)
  - affected: `9cacf81f8161111db25f98e78a7a0e32ae142b3f to before 554ba7195c4108726450e24480c8449990c2268c` (git)
  - affected: `9cacf81f8161111db25f98e78a7a0e32ae142b3f to before d02a12b4085ffe41ea750b1007f7a9c7aee2875a` (git)
  - affected: `9cacf81f8161111db25f98e78a7a0e32ae142b3f to before e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2` (git)
  - affected: `9cacf81f8161111db25f98e78a7a0e32ae142b3f to before f68671b1a98d426c57864bd457c125fee14ac1a5` (git)
  - affected: `9cacf81f8161111db25f98e78a7a0e32ae142b3f to before 2bdbe00454200fcb0110f31eeca8d906a3515e74` (git)
  - affected: `9cacf81f8161111db25f98e78a7a0e32ae142b3f to before 31a89af4f513d750fec196e2bb6195a7d4473e9f` (git)
  - affected: `9cacf81f8161111db25f98e78a7a0e32ae142b3f to before 1b5aacd5b2419b0790e955e466d389a61c79b4b1` (git)
  - affected: `5.10.188 to before 5.10.270` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.12`
  - unaffected: `before 5.12` (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: `6.18.52 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

## 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:** 0.0022, the 12th 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-2026-90157](https://www.cve.org/CVERecord?id=CVE-2026-90157)
- [NVD: CVE-2026-90157](https://nvd.nist.gov/vuln/detail/CVE-2026-90157)

### References from the CNA

- <https://git.kernel.org/stable/c/5b09d984b38b018b123c3a9e02a96bbc6468dbe5>
- <https://git.kernel.org/stable/c/554ba7195c4108726450e24480c8449990c2268c>
- <https://git.kernel.org/stable/c/d02a12b4085ffe41ea750b1007f7a9c7aee2875a>
- <https://git.kernel.org/stable/c/e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2>
- <https://git.kernel.org/stable/c/f68671b1a98d426c57864bd457c125fee14ac1a5>
- <https://git.kernel.org/stable/c/2bdbe00454200fcb0110f31eeca8d906a3515e74>
- <https://git.kernel.org/stable/c/31a89af4f513d750fec196e2bb6195a7d4473e9f>
- <https://git.kernel.org/stable/c/1b5aacd5b2419b0790e955e466d389a61c79b4b1>

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-2026-90157>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90157/>. Everything for agents: <https://agentprime.io/llms.txt>.