What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-19

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.

Affected products

• Linux kernel: 2.6.12 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

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

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