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

Vulnerability from cvelistv5 – Published: 2026-09-17 16:06 – Updated: 2026-10-19 08:58
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
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
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 , ≤ * (original_commit_for_fix)
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{
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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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              "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",
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      "title": "ipvs: fix integer overflow in ftp helper port/address parsing",
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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": "2026-10-19T09:19:03.930",
        "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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            "url": "https://git.kernel.org/stable/c/00bcc6d679262ea42688fba1d7819ea6e56f12ef"
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/deaa88fa010ba0dfc554d09e006ddd1ce9945c82"
          },
          {
            "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"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-17T21:22:13+00:00",
      "cve": "CVE-2026-90141",
      "id": "CVE-2026-90141",
      "initial_release_date": "2026-09-17T00:00:00+00:00",
      "product_status:known_affected": "277",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipvs: fix integer overflow in ftp helper port/address parsing",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90141.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-20T00:46:00Z",
      "cve": "CVE-2026-90141",
      "id": "CVE-2026-90141",
      "initial_release_date": "2026-09-21T16:32:25Z",
      "product_status:known_affected": "344",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90141",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-90141.json",
      "version": "4"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    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.