# pipe: preserve existing fasync readers on writer setup failure

CVE record · `CVE-2026-99203`

- **Identifiers:** `CVE-2026-99203`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 28 Oct 2026
- **Updated:** 31 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 28 Oct 2026, 10:35 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: `76398425bb06b07cc3a3b1ce169c67dc9d6874ed to before 6041bcd185d4df051490fe166e64feae6c3b8291` (git)
  - affected: `76398425bb06b07cc3a3b1ce169c67dc9d6874ed to before 7cdbfa22a7e270b155ddb958b1583a999c0c8abb` (git)
  - affected: `76398425bb06b07cc3a3b1ce169c67dc9d6874ed to before 22c7f57b0c0b0b8e19cfb41a1bd85f55715ad386` (git)
  - affected: `76398425bb06b07cc3a3b1ce169c67dc9d6874ed to before 94be790dd6fbe0912f35bb711bea8ef3687eaca9` (git)
  - affected: `76398425bb06b07cc3a3b1ce169c67dc9d6874ed to before 9b0aa2a1d8df51f3dcb363c3a2d9531098e88dc6` (git)
  - affected: `76398425bb06b07cc3a3b1ce169c67dc9d6874ed to before 4c42ce499ce4b1c787e61082e3b13df4f30c4eaa` (git)
  - affected: `76398425bb06b07cc3a3b1ce169c67dc9d6874ed to before 2259809e5b7043c4ba20af7b14ba3e471cf55521` (git)
  - affected: `76398425bb06b07cc3a3b1ce169c67dc9d6874ed to before 40bb03d3ea6f6a915218508819ecc4d7a7fa260d` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.30`
  - unaffected: `before 2.6.30` (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: `7.2.13 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

- 7.8 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:** 0.0012, the 1st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 28 Oct 2026, 10:35 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-99203)

## Sources

- [CVE List: CVE-2026-99203](https://www.cve.org/CVERecord?id=CVE-2026-99203)
- [NVD: CVE-2026-99203](https://nvd.nist.gov/vuln/detail/CVE-2026-99203)

### References from the CNA

- <https://git.kernel.org/stable/c/6041bcd185d4df051490fe166e64feae6c3b8291>
- <https://git.kernel.org/stable/c/7cdbfa22a7e270b155ddb958b1583a999c0c8abb>
- <https://git.kernel.org/stable/c/22c7f57b0c0b0b8e19cfb41a1bd85f55715ad386>
- <https://git.kernel.org/stable/c/94be790dd6fbe0912f35bb711bea8ef3687eaca9>
- <https://git.kernel.org/stable/c/9b0aa2a1d8df51f3dcb363c3a2d9531098e88dc6>
- <https://git.kernel.org/stable/c/4c42ce499ce4b1c787e61082e3b13df4f30c4eaa>
- <https://git.kernel.org/stable/c/2259809e5b7043c4ba20af7b14ba3e471cf55521>
- <https://git.kernel.org/stable/c/40bb03d3ea6f6a915218508819ecc4d7a7fa260d>

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-2026-99203>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-99203/>. Everything for agents: <https://agentprime.io/llms.txt>.