{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64113",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64113"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "ixgbevf: fix use-after-free in VEPA multicast source pruning",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nixgbevf: fix use-after-free in VEPA multicast source pruning\n\nixgbevf_clean_rx_irq() prunes frames whose source MAC matches the VF's\nown address (VEPA multicast workaround) by freeing the skb and\ncontinuing to the next descriptor:\n\n    dev_kfree_skb_irq(skb);\n    continue;\n\nThe skb pointer is declared outside the while loop and persists across\niterations.  Because the continue skips the \"skb = NULL\" reset at the\nbottom of the loop, the next iteration enters the \"else if (skb)\" path\nand calls ixgbevf_add_rx_frag() on the freed skb, dereferencing\nskb_shinfo(skb)->nr_frags - a use-after-free in NAPI softirq context.\n\nThe sibling driver iavf already handles this correctly by nulling the\npointer before continuing.  Apply the same pattern here.\n\nI do not have ixgbevf hardware; the bug was found by static analysis\n(scan_drop_continue_loops.py + semgrep drop_continue_in_loop, multi-tool\ncorroboration with the highest score in the scan).  The UAF was confirmed\nunder KASAN by loading a test module that reproduces the exact code\npattern (alloc skb, kfree_skb, then read skb_shinfo(skb)->nr_frags):\n\n  BUG: KASAN: slab-use-after-free in ixgbevf_uaf_test_init+0x100/0x1000\n  Read of size 8 at addr 000000006163ae78 by task insmod/30\n  freed 208-byte region [000000006163adc0, 000000006163ae90)\n\nQEMU emulates igb (82576) but not ixgbe (82599), and the igbvf VF\ndriver does not include the VEPA source pruning path, so a full\nend-to-end reproduction with emulated hardware was not possible.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.175",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64113"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3d931ac62411a7e43b85dba5fe45e1a4a91bd5cb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6ef30384a50a50e4a484cddf341bc27de31aa3de"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/55b3e91d62b2f7a24109b2d7c9f4c66d2e3b1ec1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/add70e2682c0ad3be2a5810bcf1bc13963ba4df9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a244395d8c563ed1bb26c3ef708db6aeeaa08084"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dfef79e09ed2f5df975c98547f97f5d7f8982a24"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e8768bcbe5cd30c4ea36a22022c9ffaa66903693"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5d49b568c188dc77199d8d2b959c91da8cc27cf1"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The bug is in the ixgbevf NAPI receive path triggered by incoming Ethernet frames delivered by the VF hardware; per kernel guidance, driver bugs reachable via received packets are scored as Network.\nAC:L - An attacker can reliably trigger the bug by sending a VEPA-reflected multicast/broadcast frame whose source MAC matches the VF address, then immediately sending a follow-on frame so the next loop iteration reuses the freed skb pointer in the same NAPI poll.\nPR:N - Exploitation requires only the ability to inject crafted L2 frames at the VF (e.g., a co-tenant VM on the same VLAN/cloud segment); no local account or capabilities on the victim system are needed.\nUI:N - No victim user action is required; the UAF occurs automatically during softirq packet processing once the crafted frames are received.\nS:U - Impact is kernel memory corruption within the same privilege domain (guest or host kernel running the VF driver), not a cross-VM/host security-boundary escape.\nC:H - The UAF reads freed slab memory via `skb_shinfo(skb)->nr_frags` in `ixgbevf_add_rx_frag()`, which KASAN confirmed and which can be leveraged for arbitrary kernel memory disclosure.\nI:H - The same UAF path writes into the freed skb through `skb_add_rx_frag()` (fragment metadata, lengths), enabling heap corruption and potential control-flow hijack.\nA:H - Use-after-free in NAPI softirq context can cause kernel oops/panic during receive processing even without full exploitation."
    }
  }
}