CVE-2026-64035 (GCVE-0-2026-64035)
Vulnerability from cvelistv5
Published
2026-07-19 15:39
Modified
2026-08-05 12:38
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: igc: set tx buffer type for SMD frames Sashiko pointed out that igc_fpe_init_smd_frame() initializes igc_tx_buffer fields for an SMD skb, but does not set the buffer type: https://sashiko.dev/#/patchset/20260415025226.114115-1-kohei%40enjuk.jp Since igc_tx_buffer entries are reused, a stale XDP or XSK type can remain and make TX completion use the wrong cleanup path. Set the buffer type to IGC_TX_BUFFER_TYPE_SKB.
References
Impacted products
Vendor Product Version
Linux Linux Version: 5422570c0010bb968738f9256eb2bf83e79b4d63
Version: 5422570c0010bb968738f9256eb2bf83e79b4d63
Version: 5422570c0010bb968738f9256eb2bf83e79b4d63
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/intel/igc/igc_tsn.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "versionType": "git"
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            {
              "lessThan": "1c8587bd025244aa52061f5ceecbf5e68a1063d9",
              "status": "affected",
              "version": "5422570c0010bb968738f9256eb2bf83e79b4d63",
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            {
              "lessThan": "5acc641e590e008caaed480ed9ffae47cf7ecbdf",
              "status": "affected",
              "version": "5422570c0010bb968738f9256eb2bf83e79b4d63",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/intel/igc/igc_tsn.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nigc: set tx buffer type for SMD frames\n\nSashiko pointed out that igc_fpe_init_smd_frame() initializes\nigc_tx_buffer fields for an SMD skb, but does not set the buffer type:\nhttps://sashiko.dev/#/patchset/20260415025226.114115-1-kohei%40enjuk.jp\n\nSince igc_tx_buffer entries are reused, a stale XDP or XSK type can\nremain and make TX completion use the wrong cleanup path.\n\nSet the buffer type to IGC_TX_BUFFER_TYPE_SKB."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable TX completion path is reached when the igc driver receives an Ethernet SMD-V/SMD-R mPacket from a link partner and automatically transmits an SMD response frame; this is a network-delivered L2 frame processed in the RX/NAPI path per kernel network-reachability guidance.\nAC:L - Once FPE/pMAC is enabled on the target, an attacker can repeatedly inject SMD-V frames to trigger SMD-R transmissions and race ring-slot reuse; stale XDP/XSK buffer types persist after prior transmissions on the same queue index, making reliable triggering feasible without conditions outside attacker influence.\nPR:N - Exploitation requires only the ability to send Ethernet frames to a host that already has FPE/pMAC administratively enabled (expected in TSN/industrial deployments); the attacker does not need local accounts, CAP_NET_ADMIN, or any authenticated session to reach the vulnerable code path.\nUI:N - No victim interaction is required; SMD response transmission and the resulting erroneous TX cleanup occur automatically in interrupt/NAPI context in response to attacker-supplied link-layer frames.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same kernel security domain; this is not a VM escape, IOMMU bypass, or cross-authority sandbox breakout.\nC:H - Stale XDP buffer typing causes `xdp_return_frame()` to interpret an `sk_buff` pointer as an `xdp_frame`, a type confusion that reads attacker-influenced structure fields and can yield arbitrary kernel memory disclosure primitives.\nI:H - The wrong TX cleanup path performs improper `xdp_return_frame()`/`__xdp_return()` operations on mis-typed memory, enabling heap corruption and exploitable control-flow or arbitrary-write primitives typical of kernel type-confusion bugs.\nA:H - Mis-typed TX buffer cleanup can immediately kernel-oops or panic via invalid page-pool returns, and repeated triggering leaks SKBs/DMA mappings causing sustained denial of service on the affected interface or host."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:38:29.607Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1f83545f432d106d5fc71d3997b2d382104ebcc4"
        },
        {
          "url": "https://git.kernel.org/stable/c/1c8587bd025244aa52061f5ceecbf5e68a1063d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/5acc641e590e008caaed480ed9ffae47cf7ecbdf"
        }
      ],
      "title": "igc: set tx buffer type for SMD frames",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64035",
    "datePublished": "2026-07-19T15:39:24.128Z",
    "dateReserved": "2026-07-19T07:54:57.028Z",
    "dateUpdated": "2026-08-05T12:38:29.607Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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