{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"
            },
            {
              "fixed": "5d0aa038a90b30c9bedde0c41c1fdcd98ecb16e9"
            },
            {
              "fixed": "3f5e3005984645bf5bd129c6b13149879580b1fb"
            },
            {
              "fixed": "f782dd382203b2a8c4552a628431b7de65a19a7b"
            },
            {
              "fixed": "143d4fa68ae9efb83b0c55b12cc7f0d03732a2b1"
            },
            {
              "fixed": "524371398d8463ea7e101fce2cbf3915645d1730"
            },
            {
              "fixed": "fa1dbc93530b34fab0da9862426fe9c918c74dc0"
            },
            {
              "fixed": "c87dd137c0dad07cc55f98181ff380b0c23d2878"
            },
            {
              "fixed": "d10a26aa4d072320530e6968ef945c8c575edf61"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.12"
            },
            {
              "fixed": "5.10.253"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.203"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.168"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.134"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.81"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.22"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43011.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/x25: Fix potential double free of skb\n\nWhen alloc_skb fails in x25_queue_rx_frame it calls kfree_skb(skb) at\nline 48 and returns 1 (error).\nThis error propagates back through the call chain:\n\nx25_queue_rx_frame returns 1\n    |\n    v\nx25_state3_machine receives the return value 1 and takes the else\nbranch at line 278, setting queued=0 and returning 0\n    |\n    v\nx25_process_rx_frame returns queued=0\n    |\n    v\nx25_backlog_rcv at line 452 sees queued=0 and calls kfree_skb(skb)\nagain\n\nThis would free the same skb twice. Looking at x25_backlog_rcv:\n\nnet/x25/x25_in.c:x25_backlog_rcv() {\n    ...\n    queued = x25_process_rx_frame(sk, skb);\n    ...\n    if (!queued)\n        kfree_skb(skb);\n}",
  "id": "CVE-2026-43011",
  "modified": "2026-07-08T05:38:37.696682307Z",
  "published": "2026-05-01T14:15:17.597Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/143d4fa68ae9efb83b0c55b12cc7f0d03732a2b1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3f5e3005984645bf5bd129c6b13149879580b1fb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/524371398d8463ea7e101fce2cbf3915645d1730"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d0aa038a90b30c9bedde0c41c1fdcd98ecb16e9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c87dd137c0dad07cc55f98181ff380b0c23d2878"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d10a26aa4d072320530e6968ef945c8c575edf61"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f782dd382203b2a8c4552a628431b7de65a19a7b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fa1dbc93530b34fab0da9862426fe9c918c74dc0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43011.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43011"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "net/x25: Fix potential double free of skb"
}