CVE-2026-43101 (GCVE-0-2026-43101)
Vulnerability from cvelistv5
Published
2026-05-06 07:40
Modified
2026-08-05 12:25
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: ioam: fix potential NULL dereferences in __ioam6_fill_trace_data() We need to check __in6_dev_get() for possible NULL value, as suggested by Yiming Qian. Also add skb_dst_dev_rcu() instead of skb_dst_dev(), and two missing READ_ONCE(). Note that @dev can't be NULL.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0
Version: 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0
Version: 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/ioam6.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4198aab6f000b4febb18ea820fea20634dd789c7",
              "status": "affected",
              "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
              "versionType": "git"
            },
            {
              "lessThan": "3719c234fa94c37c955b1ecd3742ef280ec135e6",
              "status": "affected",
              "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
              "versionType": "git"
            },
            {
              "lessThan": "4e65a8b8daa18d63255ec58964dd192c7fdd9f8b",
              "status": "affected",
              "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/ioam6.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.24",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "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": "6.18.24",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.14",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: ioam: fix potential NULL dereferences in __ioam6_fill_trace_data()\n\nWe need to check __in6_dev_get() for possible NULL value, as\nsuggested by Yiming Qian.\n\nAlso add skb_dst_dev_rcu() instead of skb_dst_dev(),\nand two missing READ_ONCE().\n\nNote that @dev can\u0027t be NULL."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable helper is reachable while processing IPv6 IOAM Hop-by-Hop options and IOAM LWT output for packets crossing an IOAM-enabled IPv6 node, so an attacker can trigger it with network traffic in a configured IOAM deployment.\nAC:L - Once IOAM is enabled/configured on the target path, triggering only requires a valid pre-allocated trace with ingress/egress interface ID fields and a route/device state where `__in6_dev_get()` returns NULL; there is no race or difficult timing requirement.\nPR:N - The attacker does not need credentials on the target to send the triggering IPv6 traffic; the administrative IOAM setup is a target deployment condition rather than an attacker privilege.\nUI:N - No victim user action is required after the vulnerable node is configured; packet processing alone reaches the dereference.\nS:U - The impact is within the same kernel/networking security authority and does not cross a VM, IOMMU, or similar boundary.\nC:N - The bug is a NULL pointer dereference of missing IPv6 device state, not an out-of-bounds read or information disclosure primitive.\nI:N - The fixed issue does not provide attacker-controlled writes or data modification; it only prevents dereferencing NULL `inet6_dev` pointers.\nA:H - A NULL pointer dereference in kernel packet processing can oops or panic the system, causing high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:25:55.355Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4198aab6f000b4febb18ea820fea20634dd789c7"
        },
        {
          "url": "https://git.kernel.org/stable/c/3719c234fa94c37c955b1ecd3742ef280ec135e6"
        },
        {
          "url": "https://git.kernel.org/stable/c/4e65a8b8daa18d63255ec58964dd192c7fdd9f8b"
        }
      ],
      "title": "ipv6: ioam: fix potential NULL dereferences in __ioam6_fill_trace_data()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43101",
    "datePublished": "2026-05-06T07:40:30.969Z",
    "dateReserved": "2026-05-01T14:12:55.984Z",
    "dateUpdated": "2026-08-05T12:25:55.355Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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