{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/intel/iavf/iavf_ethtool.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1f931dee5b726df1940348ec31614d64bac03aa6",
              "status": "affected",
              "version": "64430f70ba6fcd5872ac190f4ae3ddee3f48f00d",
              "versionType": "git"
            },
            {
              "lessThan": "bb85741d2dc2be207353a412f51b83697fcbefcf",
              "status": "affected",
              "version": "64430f70ba6fcd5872ac190f4ae3ddee3f48f00d",
              "versionType": "git"
            },
            {
              "lessThan": "fdf902bf86a80bf15792a1d20a67a5302498d7f1",
              "status": "affected",
              "version": "64430f70ba6fcd5872ac190f4ae3ddee3f48f00d",
              "versionType": "git"
            },
            {
              "lessThan": "fecacfc95f195b99c71c579a472120d0b4ed65fa",
              "status": "affected",
              "version": "64430f70ba6fcd5872ac190f4ae3ddee3f48f00d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/intel/iavf/iavf_ethtool.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.80",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.21",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.80",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.21",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.11",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niavf: fix out-of-bounds writes in iavf_get_ethtool_stats()\n\niavf incorrectly uses real_num_tx_queues for ETH_SS_STATS. Since the\nvalue could change in runtime, we should use num_tx_queues instead.\n\nMoreover iavf_get_ethtool_stats() uses num_active_queues while\niavf_get_sset_count() and iavf_get_stat_strings() use\nreal_num_tx_queues, which triggers out-of-bounds writes when we do\n\"ethtool -L\" and \"ethtool -S\" simultaneously [1].\n\nFor example when we change channels from 1 to 8, Thread 3 could be\nscheduled before Thread 2, and out-of-bounds writes could be triggered\nin Thread 3:\n\nThread 1 (ethtool -L)       Thread 2 (work)        Thread 3 (ethtool -S)\niavf_set_channels()\n...\niavf_alloc_queues()\n-\u003e num_active_queues = 8\niavf_schedule_finish_config()\n                                                   iavf_get_sset_count()\n                                                   real_num_tx_queues: 1\n                                                   -\u003e buffer for 1 queue\n                                                   iavf_get_ethtool_stats()\n                                                   num_active_queues: 8\n                                                   -\u003e out-of-bounds!\n                            iavf_finish_config()\n                            -\u003e real_num_tx_queues = 8\n\nUse immutable num_tx_queues in all related functions to avoid the issue.\n\n[1]\n BUG: KASAN: vmalloc-out-of-bounds in iavf_add_one_ethtool_stat+0x200/0x270\n Write of size 8 at addr ffffc900031c9080 by task ethtool/5800\n\n CPU: 1 UID: 0 PID: 5800 Comm: ethtool Not tainted 6.19.0-enjuk-08403-g8137e3db7f1c #241 PREEMPT(full)\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n Call Trace:\n  \u003cTASK\u003e\n  dump_stack_lvl+0x6f/0xb0\n  print_report+0x170/0x4f3\n  kasan_report+0xe1/0x180\n  iavf_add_one_ethtool_stat+0x200/0x270\n  iavf_get_ethtool_stats+0x14c/0x2e0\n  __dev_ethtool+0x3d0c/0x5830\n  dev_ethtool+0x12d/0x270\n  dev_ioctl+0x53c/0xe30\n  sock_do_ioctl+0x1a9/0x270\n  sock_ioctl+0x3d4/0x5e0\n  __x64_sys_ioctl+0x137/0x1c0\n  do_syscall_64+0xf3/0x690\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n RIP: 0033:0x7f7da0e6e36d\n ...\n  \u003c/TASK\u003e\n\n The buggy address belongs to a 1-page vmalloc region starting at 0xffffc900031c9000 allocated at __dev_ethtool+0x3cc9/0x5830\n The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000\n index:0xffff88813a013de0 pfn:0x13a013\n flags: 0x200000000000000(node=0|zone=2)\n raw: 0200000000000000 0000000000000000 dead000000000122 0000000000000000\n raw: ffff88813a013de0 0000000000000000 00000001ffffffff 0000000000000000\n page dumped because: kasan: bad access detected\n\n Memory state around the buggy address:\n  ffffc900031c8f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n  ffffc900031c9000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n \u003effffc900031c9080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n                    ^\n  ffffc900031c9100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n  ffffc900031c9180: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable path is reached locally through `ioctl(SIOCETHTOOL)` on a socket, specifically `ETHTOOL_GSTATS` calling the iavf ethtool statistics callback. Remote packets may influence counter values but do not directly invoke the vulnerable code.\nAC:L - The bug is a race between attacker-issued channel reconfiguration and stats retrieval; the attacker can repeatedly run `ethtool -L` and `ethtool -S` to hit the window before `finish_config` updates `real_num_tx_queues`. No rare external condition is required.\nPR:L - `ETHTOOL_GSTATS` is allowed to any local user, but reliably creating the mismatched queue-count state requires `ETHTOOL_SCHANNELS`, gated by `ns_capable(net-\u003euser_ns, CAP_NET_ADMIN)`. In plausible delegated VF/container netns deployments this is a low namespace privilege rather than real init-namespace root.\nUI:N - No victim action is required when the attacker has the needed local namespace capability; the attacker can issue both ethtool operations directly. The vulnerable stats read itself is synchronous from the attacker\u2019s ioctl.\nS:U - The corruption occurs inside the same kernel security authority as the vulnerable network driver. This is standard kernel memory corruption/privilege escalation, not a VM escape or IOMMU boundary bypass.\nC:H - The flaw is an out-of-bounds kernel write in a vmalloc-backed stats buffer, which is memory corruption that can plausibly be leveraged during exploitation for information disclosure. Under the required conservative rule, this is High.\nI:H - The vulnerable function writes attacker-influenced u64 statistics past the allocated buffer when queue counts diverge. Out-of-bounds kernel writes are treated as high integrity impact because they can corrupt kernel memory and potentially enable code execution.\nA:H - The reported failure is a KASAN vmalloc-out-of-bounds write in kernel context, and the same corruption can oops or panic the kernel. The trigger can be repeated by local ethtool calls."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:23:08.072Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1f931dee5b726df1940348ec31614d64bac03aa6"
        },
        {
          "url": "https://git.kernel.org/stable/c/bb85741d2dc2be207353a412f51b83697fcbefcf"
        },
        {
          "url": "https://git.kernel.org/stable/c/fdf902bf86a80bf15792a1d20a67a5302498d7f1"
        },
        {
          "url": "https://git.kernel.org/stable/c/fecacfc95f195b99c71c579a472120d0b4ed65fa"
        }
      ],
      "title": "iavf: fix out-of-bounds writes in iavf_get_ethtool_stats()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31505",
    "datePublished": "2026-04-22T13:54:24.524Z",
    "dateReserved": "2026-03-09T15:48:24.105Z",
    "dateUpdated": "2026-08-05T12:23:08.072Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}