Linux kernel: memory corruption

Linux kernel

In the Linux kernel, the following vulnerability has been resolved: ipv4: free inet_opt and ireq_opt after an RCU grace period tcp_v4_syn_recv_sock() transfers ownership of ireq->ireq_opt to the child socket (newinet->inet_opt) without copying it.

Do this now

Restrict untrusted network access to affected hosts until the vendor releases a fix, and watch the advisory for one.

Still cooking for Linux.

First seen: 29 Oct 2026
Last update: 29 Oct 2026, 17:18 UTC
Identifiers: CVE-2026-98432
CVSS: 9.8
Source: news
On the menu as: Linux kernel

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Linux kernel: memory corruption
Severity: critical. Patch status: no fix yet.
Affected: Linux kernel
Ids: CVE-2026-98432

In the Linux kernel, the following vulnerability has been resolved: ipv4: free inet_opt and ireq_opt after an RCU grace period tcp_v4_syn_recv_sock() transfers ownership of ireq->ireq_opt to the child socket (newinet->inet_opt) without copying it.

## Steps
1. This touches infrastructure (linux). Look in terraform, ansible, cloud-init, Dockerfiles and docs for the product and version we run. If it isn't in the repo, say so and list what a human should check on the box.
2. Linux 4.4.x: the CVE record names no fix; check the vendor advisory before assuming there is none. Until one ships: restrict network access to it.

## Fix by release line
| Line | State | Fix | Until then |
|---|---|---|---|
| Linux 4.4.x | not named in the CVE record | check the vendor advisory: https://git.kernel.org/stable/c/11a03ce3c4a62d84c10ccdfe47f8075006498568 | restrict network access to it |

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-98432") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://git.kernel.org/stable/c/11a03ce3c4a62d84c10ccdfe47f8075006498568 https://nvd.nist.gov/vuln/detail/CVE-2026-98432 https://thehackernews.com/2026/10/linux-kernel-tcp-flaw-with-98-cvss.html
https://pwned.coffee/i/in-the-linux-kernel-the-following-vulnerability-has-been-cve-2026-98432

Timeline

29 Oct 2026, 17:17 UTC
Added to CISA's KEV catalog.
29 Oct 2026, 17:17 UTC
Fix status: unknown → no fix yet.
29 Oct 2026, 17:17 UTC
Anthropic's AI model wrote an exploit for the flaw.
29 Oct 2026
First reported.

Receipt

Exploitation: No known exploitation
Fix by release line: Product Affected Fixed in Source
Linux = 4.4 fix not named in the CVE record: see vendor advisory CVE record (CNA) checked 29 Oct
The CVE record names no fix for one line; the vendor’s advisory may: git.kernel.org
Score: CVSS 9.8 (critical). CVSS 3.1 9.8 (CNA Linux) for CVE-2026-98432
Last checked: 30 Oct 2026, 00:18 UTC

Product	Affected	Fixed in	Source
Linux	= 4.4	fix not named in the CVE record: see vendor advisory	CVE record (CNA) checked 29 Oct

Sources: KEV – CVE record ✓ Vendor ✓

Sources

Wrong fix version, or a source we missed? Send it back to chef@pwned.coffee with the source, and we'll correct it here.

Totalone very hot coffee