net-shapers: don't free reply skb after genlmsg_reply()

{
  "id": "cd5d4901f725cd4bb82aebf2da7bc2c94eb89b0c25bd491b8805fe438e3269c3",
  "url": "https://osv.dev/vulnerability/CVE-2026-43481",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net-shapers: don't free reply skb after genlmsg_reply()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net-shapers: don't free reply skb after genlmsg_reply() genlmsg_reply() hands the reply skb to netlink, and netlink_unicast() consumes it on all return paths, whether the skb is queued successfully or freed on an error path. net_shaper_nl_get_doit() and net_shaper_nl_cap_get_doit() currently jump to free_msg after genlmsg_reply() fails and call nlmsg_free(msg), which can hit the same skb twice. Return the genlmsg_reply() error directly and keep free_msg only for pre-reply failures.",
    "evidence": "osv:CVE-2026-43481",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.19",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-43481",
      "aliases": [
        "CVE-2026-43481"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "4b623f9f0f59652ea71fcb27d60b4c3b65126dbb"
                },
                {
                  "fixed": "8738dcc844fff7d0157ee775230e95df3b1884d7"
                },
                {
                  "fixed": "83f7b54242d0abbfce35a55c01322f50962ed3ee"
                },
                {
                  "fixed": "57885276cc16a2e2b76282c808a4e84cbecb3aae"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43481.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.19"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "6.19.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43481.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.976640137Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/57885276cc16a2e2b76282c808a4e84cbecb3aae",
        "https://git.kernel.org/stable/c/83f7b54242d0abbfce35a55c01322f50962ed3ee",
        "https://git.kernel.org/stable/c/8738dcc844fff7d0157ee775230e95df3b1884d7",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43481.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-43481",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43481.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-43481",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 498837,
  "published_at": "2026-05-13T15:08:29.116+00:00"
}