CVE-2026-46273 (GCVE-0-2026-46273)

Vulnerability from cvelistv5 – Published: 2026-06-03 16:19 – Updated: 2026-08-05 12:30
VLAI
Title
ibmveth: Disable GSO for packets with small MSS
Summary
In the Linux kernel, the following vulnerability has been resolved: ibmveth: Disable GSO for packets with small MSS Some physical adapters on Power systems do not support segmentation offload when the MSS is less than 224 bytes. Attempting to send such packets causes the adapter to freeze, stopping all traffic until manually reset. Implement ndo_features_check to disable GSO for packets with small MSS values. The network stack will perform software segmentation instead. The 224-byte minimum matches ibmvnic commit <f10b09ef687f> ("ibmvnic: Enforce stronger sanity checks on GSO packets") which uses the same physical adapters in SEA configurations. The issue occurs specifically when the hardware attempts to perform segmentation (gso_segs > 1) with a small MSS. Single-segment GSO packets (gso_segs == 1) do not trigger the problematic LSO code path and are transmitted normally without segmentation. Add an ndo_features_check callback to disable GSO when MSS < 224 bytes. Also call vlan_features_check() to ensure proper handling of VLAN packets, particularly QinQ (802.1ad) configurations where the hardware parser may not support certain offload features. Validated using iptables to force small MSS values. Without the fix, the adapter freezes. With the fix, packets are segmented in software and transmission succeeds. Comprehensive regression testing completedd (MSS tests, performance, stability).
Severity
8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8641dd85799f85bef5f0d1f87356aaa12cb2195e , < 86fc64584811d43c9ccd74447de58620189d8b77 (git)
Affected: 8641dd85799f85bef5f0d1f87356aaa12cb2195e , < 9a5e984d7af910e46dcbed3ce77873e000a4f77d (git)
Affected: 8641dd85799f85bef5f0d1f87356aaa12cb2195e , < 1cdf5dbcec988d06f5f720bdf89e91073f77fa10 (git)
Affected: 8641dd85799f85bef5f0d1f87356aaa12cb2195e , < 82bc89fbb82d9396fb4eaee8720ea85e2e787957 (git)
Affected: 8641dd85799f85bef5f0d1f87356aaa12cb2195e , < db8012c631cb845e9ae2b4b531e17d86c9519755 (git)
Affected: 8641dd85799f85bef5f0d1f87356aaa12cb2195e , < c1f261863e65b508f37416dfbc5c5d911c9b9233 (git)
Affected: 8641dd85799f85bef5f0d1f87356aaa12cb2195e , < 3af24f0c4c31f18a4a2d927990759194832bb6e9 (git)
Affected: 8641dd85799f85bef5f0d1f87356aaa12cb2195e , < cc427d24ac6442ffdeafd157a63c7c5b73ed4de4 (git)
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Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.30 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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            "drivers/net/ethernet/ibm/ibmveth.c",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nibmveth: Disable GSO for packets with small MSS\n\nSome physical adapters on Power systems do not support segmentation\noffload when the MSS is less than 224 bytes. Attempting to send such\npackets causes the adapter to freeze, stopping all traffic until\nmanually reset.\n\nImplement ndo_features_check to disable GSO for packets with small MSS\nvalues. The network stack will perform software segmentation instead.\n\nThe 224-byte minimum matches ibmvnic\ncommit \u003cf10b09ef687f\u003e (\"ibmvnic: Enforce stronger sanity checks\non GSO packets\")\nwhich uses the same physical adapters in SEA configurations.\n\nThe issue occurs specifically when the hardware attempts to perform\nsegmentation (gso_segs \u003e 1) with a small MSS. Single-segment GSO packets\n(gso_segs == 1) do not trigger the problematic LSO code path and are\ntransmitted normally without segmentation.\n\nAdd an ndo_features_check callback to disable GSO when MSS \u003c 224 bytes.\nAlso call vlan_features_check() to ensure proper handling of VLAN packets,\nparticularly QinQ (802.1ad) configurations where the hardware parser may\nnot support certain offload features.\n\nValidated using iptables to force small MSS values. Without the fix,\nthe adapter freezes. With the fix, packets are segmented in software\nand transmission succeeds. Comprehensive regression testing completedd\n(MSS tests, performance, stability)."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - A remote attacker on a network path to an IBM Power LPAR can trigger the bug by advertising TCP MSS below 224 bytes and causing large outbound traffic that is GSO-transmitted on ibmveth.\nAC:L - The attacker controls TCP MSS in the handshake and can reliably generate multi-segment GSO transmits (gso_segs \u003e 1); no race or rare victim state is required beyond normal TCP and TSO-enabled ibmveth deployments.\nPR:N - Exploitation requires only the ability to send TCP traffic to a listening service on the victim; no local account, capabilities, or namespace privileges on the target are needed.\nUI:N - No victim user action is required beyond the system running network-exposed services that accept TCP connections.\nS:C - On shared SEA/backing-adapter Power deployments, freezing the physical adapter can stop network traffic for other LPARs or tenants beyond the attacking partition\u2019s security boundary.\nC:N - The failure mode is adapter freeze/DoS with no kernel memory corruption, out-of-bounds access, or information disclosure primitive described or implied in the fix.\nI:N - There is no arbitrary memory write or code execution path; impact is loss of network function rather than modification of kernel or application data integrity.\nA:H - The adapter freezes and all traffic stops until manual reset, constituting complete, persistent loss of network availability for affected systems."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:30:56.753Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/86fc64584811d43c9ccd74447de58620189d8b77"
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          "url": "https://git.kernel.org/stable/c/9a5e984d7af910e46dcbed3ce77873e000a4f77d"
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      "title": "ibmveth: Disable GSO for packets with small MSS",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46273",
    "datePublished": "2026-06-03T16:19:18.056Z",
    "dateReserved": "2026-05-13T15:03:33.109Z",
    "dateUpdated": "2026-08-05T12:30:56.753Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-46273",
      "date": "2026-08-05",
      "epss": "0.00389",
      "percentile": "0.31606"
    },
    "microsoft_vex": {
      "current_release_date": "2026-06-09T14:51:00.000Z",
      "cve": "CVE-2026-46273",
      "id": "msrc_CVE-2026-46273",
      "initial_release_date": "2026-06-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ibmveth: Disable GSO for packets with small MSS",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46273.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-46273\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-03T18:16:29.160\",\"lastModified\":\"2026-07-22T20:10:00.127\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nibmveth: Disable GSO for packets with small MSS\\n\\nSome physical adapters on Power systems do not support segmentation\\noffload when the MSS is less than 224 bytes. Attempting to send such\\npackets causes the adapter to freeze, stopping all traffic until\\nmanually reset.\\n\\nImplement ndo_features_check to disable GSO for packets with small MSS\\nvalues. The network stack will perform software segmentation instead.\\n\\nThe 224-byte minimum matches ibmvnic\\ncommit \u003cf10b09ef687f\u003e (\\\"ibmvnic: Enforce stronger sanity checks\\non GSO packets\\\")\\nwhich uses the same physical adapters in SEA configurations.\\n\\nThe issue occurs specifically when the hardware attempts to perform\\nsegmentation (gso_segs \u003e 1) with a small MSS. Single-segment GSO packets\\n(gso_segs == 1) do not trigger the problematic LSO code path and are\\ntransmitted normally without segmentation.\\n\\nAdd an ndo_features_check callback to disable GSO when MSS \u003c 224 bytes.\\nAlso call vlan_features_check() to ensure proper handling of VLAN packets,\\nparticularly QinQ (802.1ad) configurations where the hardware parser may\\nnot support certain offload features.\\n\\nValidated using iptables to force small MSS values. Without the fix,\\nthe adapter freezes. With the fix, packets are segmented in software\\nand transmission succeeds. Comprehensive regression testing completedd\\n(MSS tests, performance, stability).\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nibmveth: Deshabilitar GSO para paquetes con MSS peque\u00f1o\\n\\nAlgunos adaptadores f\u00edsicos en sistemas Power no soportan la descarga de segmentaci\u00f3n cuando el MSS es inferior a 224 bytes. Intentar enviar dichos paquetes hace que el adaptador se congele, deteniendo todo el tr\u00e1fico hasta que se reinicie manualmente.\\n\\nImplementar ndo_features_check para deshabilitar GSO para paquetes con valores de MSS peque\u00f1os. La pila de red realizar\u00e1 la segmentaci\u00f3n por software en su lugar.\\n\\nEl m\u00ednimo de 224 bytes coincide con el commit \u003cf10b09ef687f\u003e de ibmvnic (\u0027ibmvnic: Aplicar comprobaciones de cordura m\u00e1s estrictas en los paquetes GSO\u0027) que utiliza los mismos adaptadores f\u00edsicos en configuraciones SEA.\\n\\nEl problema ocurre espec\u00edficamente cuando el hardware intenta realizar la segmentaci\u00f3n (gso_segs \u003e 1) con un MSS peque\u00f1o. Los paquetes GSO de un solo segmento (gso_segs == 1) no activan la ruta de c\u00f3digo LSO problem\u00e1tica y se transmiten normalmente sin segmentaci\u00f3n.\\n\\nA\u00f1adir una devoluci\u00f3n de llamada ndo_features_check para deshabilitar GSO cuando MSS \u003c 224 bytes. Tambi\u00e9n llamar a vlan_features_check() para asegurar el manejo adecuado de los paquetes VLAN, particularmente configuraciones QinQ (802.1ad) donde el analizador de hardware puede no soportar ciertas caracter\u00edsticas de descarga.\\n\\nValidado usando iptables para forzar valores de MSS peque\u00f1os. Sin la correcci\u00f3n, el adaptador se congela. Con la correcci\u00f3n, los paquetes se segmentan por software y la transmisi\u00f3n tiene \u00e9xito. Pruebas de regresi\u00f3n exhaustivas completadas (pruebas de MSS, rendimiento, estabilidad).\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/ethernet/ibm/ibmveth.c\",\"drivers/net/ethernet/ibm/ibmveth.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"8641dd85799f85bef5f0d1f87356aaa12cb2195e\",\"lessThan\":\"86fc64584811d43c9ccd74447de58620189d8b77\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8641dd85799f85bef5f0d1f87356aaa12cb2195e\",\"lessThan\":\"9a5e984d7af910e46dcbed3ce77873e000a4f77d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8641dd85799f85bef5f0d1f87356aaa12cb2195e\",\"lessThan\":\"1cdf5dbcec988d06f5f720bdf89e91073f77fa10\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8641dd85799f85bef5f0d1f87356aaa12cb2195e\",\"lessThan\":\"82bc89fbb82d9396fb4eaee8720ea85e2e787957\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8641dd85799f85bef5f0d1f87356aaa12cb2195e\",\"lessThan\":\"db8012c631cb845e9ae2b4b531e17d86c9519755\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8641dd85799f85bef5f0d1f87356aaa12cb2195e\",\"lessThan\":\"c1f261863e65b508f37416dfbc5c5d911c9b9233\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8641dd85799f85bef5f0d1f87356aaa12cb2195e\",\"lessThan\":\"3af24f0c4c31f18a4a2d927990759194832bb6e9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8641dd85799f85bef5f0d1f87356aaa12cb2195e\",\"lessThan\":\"cc427d24ac6442ffdeafd157a63c7c5b73ed4de4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/ethernet/ibm/ibmveth.c\",\"drivers/net/ethernet/ibm/ibmveth.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.2\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.2\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.140\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.88\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.30\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.7\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H\",\"baseScore\":8.6,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":4.0}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.2\",\"versionEndExcluding\":\"5.10.258\",\"matchCriteriaId\":\"5D93CC1E-5DE1-4EEC-A09C-7A816AB6C025\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.209\",\"matchCriteriaId\":\"919C10A9-7951-4A74-BADD-C135A0A8D8B4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.175\",\"matchCriteriaId\":\"92385813-D91D-480D-83A1-F423D2CBB2BA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.140\",\"matchCriteriaId\":\"A1A92866-F406-43B5-B2D1-CFC274753E9D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.88\",\"matchCriteriaId\":\"5AFBE0EC-CCDF-4207-AE92-ABF958125CA4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.30\",\"matchCriteriaId\":\"BF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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T14:45:54+00:00",
      "cve": "CVE-2026-46273",
      "id": "CVE-2026-46273",
      "initial_release_date": "2026-06-03T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ibmveth: Disable GSO for packets with small MSS",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46273.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T05:07:25Z",
      "cve": "CVE-2026-46273",
      "id": "CVE-2026-46273",
      "initial_release_date": "2026-06-04T02:21:37Z",
      "product_status:known_affected": "497",
      "product_status:known_not_affected": "17",
      "product_status:recommended": "248",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46273",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46273.json",
      "version": "13"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.