CVE-2026-64035 (GCVE-0-2026-64035)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-08-05 12:38
VLAI
Title
igc: set tx buffer type for SMD frames
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5422570c0010bb968738f9256eb2bf83e79b4d63 , < 1f83545f432d106d5fc71d3997b2d382104ebcc4 (git)
Affected: 5422570c0010bb968738f9256eb2bf83e79b4d63 , < 1c8587bd025244aa52061f5ceecbf5e68a1063d9 (git)
Affected: 5422570c0010bb968738f9256eb2bf83e79b4d63 , < 5acc641e590e008caaed480ed9ffae47cf7ecbdf (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/intel/igc/igc_tsn.c"
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          "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": [
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            "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": [
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              "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."
            }
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/1c8587bd025244aa52061f5ceecbf5e68a1063d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/5acc641e590e008caaed480ed9ffae47cf7ecbdf"
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      ],
      "title": "igc: set tx buffer type for SMD frames",
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    "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"
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            "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."
          }
        ],
        "id": "CVE-2026-64035",
        "lastModified": "2026-07-30T14:59:47.950",
        "metrics": {
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                "attackVector": "NETWORK",
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "cve": "CVE-2026-64035",
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      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: igc: set tx buffer type for SMD frames",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64035.json",
      "version": "3"
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    "suse_vex": {
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      "current_release_date": "2026-08-06T01:10:05Z",
      "cve": "CVE-2026-64035",
      "id": "CVE-2026-64035",
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      "product_status:known_not_affected": "298",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64035",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64035.json",
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}



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