CVE-2026-90141 (GCVE-0-2026-90141)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:06 – Updated: 2026-09-18 17:53
VLAI
Title
ipvs: fix integer overflow in ftp helper port/address parsing
Summary
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.
Severity
7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d02de9a7a7e2484da0cf37e50614840623b98a62 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < fc1493c905d7e0bc8830c1d83915cb7831daf1a1 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 50cb9b7263a2ed01f7d2f97818a800c2ee05f661 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < deaa88fa010ba0dfc554d09e006ddd1ce9945c82 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 00bcc6d679262ea42688fba1d7819ea6e56f12ef (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4aed450adaee3a021db27be94c61fe025b0d05ff (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b1908bff0faaa94d55be72da65879cad632e8236 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e625a9477d12baaff4025c5f9989184a907ea8fc (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: fix integer overflow in ftp helper port/address parsing\n\nip_vs_ftp_get_addrport() accumulates decimal digits into a __u16\n(hport) and into unsigned char (p[]) without checking for overflow.\nA crafted FTP PASV/EPSV response with an over-long port or address\noctet wraps the value, so the helper configures the data connection\nwith a truncated port/address.\n\nThe netfilter conntrack FTP helper had the same defect, fixed in\ncommit 2b413fc689ba (\"netfilter: nf_conntrack_ftp: avoid u16\noverflows\"). Apply the equivalent fix here: widen the port accumulator\nto u32 and reject values above 65535, and reject address octets above\n255."
        }
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            "version": "3.1"
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              "lang": "en",
              "value": "AV:N - The wrap is in ip_vs_ftp_get_addrport() on decimal octets/port from the FTP TCP payload: client PORT/EPRT arrives via ip_vs_in_hook \u2192 ip_vs_nat_xmit \u2192 tcp_dnat_handler \u2192 ip_vs_ftp_in, and server PASV \"227 \"/EPSV \"229 \" via ip_vs_out_hook \u2192 tcp_snat_handler \u2192 ip_vs_ftp_out. FTP/TCP is a routable IP protocol.\nAC:L - Each extra digit deterministically wraps: unsigned char p[i] is truncated on assignment, and __u16 hport wraps on hport*10+digit. After an IP_VS_TCP_S_ESTABLISHED NAT FTP control conn, a single crafted PORT/EPRT or 227/229 line is enough; there is no race or attacker-uncontrolled layout.\nPR:N - tcp_app_conn_bind() attaches the ftp helper for MASQ conns to the app port (default 21) with no FTP USER/PASS check; ip_vs_ftp_in/ip_vs_ftp_out parse any established control payload. A remote peer that completes the TCP handshake to the IPVS VIP supplies the digits with no kernel credentials.\nUI:N - The attacker sends the PORT/EPRT command, or as the scheduled real server the PASV/EPSV reply, on a TCP session they already established; no other user must mount, open a file, or change IPVS configuration.\nS:U - ip_vs_conn_new(), ip_vs_tcp_conn_listen(), and ip_vs_nfct_expect_related() only change IPVS connection and netfilter expectation state on the load-balancer host; no VM, IOMMU, or guest-to-host boundary is crossed.\nC:L - The truncated p[]/hport values become the data-connection tuple in ip_vs_conn_new(), and PASV/EPSV also calls ip_vs_nfct_expect_related() for a RELATED expectation on VIP:wrapped_port, so TCP to that port can be bound to the FTP session and its payload observed. This is not an arbitrary kernel read.\nI:L - ip_vs_ftp_in/ip_vs_ftp_out install the wrapped address/port via ip_vs_conn_new() and, for PASV/EPSV, rewrite the 227/229 text with nf_nat_mangle_tcp_packet() using n_cp-\u003evport, so forwarding/NAT state describes a different endpoint than the peer sent. There is no OOB write or control-flow hijack.\nA:L - ip_vs_tcp_conn_listen() parks the truncated-port conn in LISTEN, so the FTP data transfer fails and SYNs to that VIP port can be claimed instead of another virtual service until the conn times out. The parser does not oops, panic, or loop."
            }
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    "datePublished": "2026-09-17T16:06:38.478Z",
    "dateReserved": "2026-09-11T19:38:34.789Z",
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      "cve": "CVE-2026-90141",
      "id": "msrc_CVE-2026-90141",
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      "product_status:fixed": "1",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ipvs: fix integer overflow in ftp helper port/address parsing",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-90141.json",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: fix integer overflow in ftp helper port/address parsing\n\nip_vs_ftp_get_addrport() accumulates decimal digits into a __u16\n(hport) and into unsigned char (p[]) without checking for overflow.\nA crafted FTP PASV/EPSV response with an over-long port or address\noctet wraps the value, so the helper configures the data connection\nwith a truncated port/address.\n\nThe netfilter conntrack FTP helper had the same defect, fixed in\ncommit 2b413fc689ba (\"netfilter: nf_conntrack_ftp: avoid u16\noverflows\"). Apply the equivalent fix here: widen the port accumulator\nto u32 and reject values above 65535, and reject address octets above\n255."
          }
        ],
        "id": "CVE-2026-90141",
        "lastModified": "2026-09-18T18:17:43.397",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "LOW",
                "baseScore": 7.3,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "LOW",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 3.4,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
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        },
        "published": "2026-09-17T17:17:06.857",
        "references": [
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e625a9477d12baaff4025c5f9989184a907ea8fc"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fc1493c905d7e0bc8830c1d83915cb7831daf1a1"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.