{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "230bb13650b0f186f540500fd5f5f7096a822a2a"
            },
            {
              "fixed": "a73d95b57bf9faebdfed591bcb7ed9292062a84c"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "1cb6f0bae50441f4b4b32a28315853b279c7404e"
            },
            {
              "fixed": "37bef86e5428d59f70a4da82b80f9a8f252fecbe"
            },
            {
              "fixed": "4c9af67f99aa3e51b522c54968ab3ac8272be41c"
            },
            {
              "fixed": "0509b762bc5e8ea7b8391130730c6d8502fc6e69"
            },
            {
              "fixed": "a0671125d4f55e1e98d9bde8a0b671941987e208"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "f61ecf1bd5b562ebfd7d430ccb31619857e80857"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.6.41"
            },
            {
              "fixed": "6.6.130"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.9.10"
            },
            {
              "fixed": "6.10"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.6.130"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.78"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.10.0"
            },
            {
              "fixed": "6.18.20"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.19.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23413.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nclsact: Fix use-after-free in init/destroy rollback asymmetry\n\nFix a use-after-free in the clsact qdisc upon init/destroy rollback asymmetry.\nThe latter is achieved by first fully initializing a clsact instance, and\nthen in a second step having a replacement failure for the new clsact qdisc\ninstance. clsact_init() initializes ingress first and then takes care of the\negress part. This can fail midway, for example, via tcf_block_get_ext(). Upon\nfailure, the kernel will trigger the clsact_destroy() callback.\n\nCommit 1cb6f0bae504 (\"bpf: Fix too early release of tcx_entry\") details the\nway how the transition is happening. If tcf_block_get_ext on the q-\u003eingress_block\nends up failing, we took the tcx_miniq_inc reference count on the ingress\nside, but not yet on the egress side. clsact_destroy() tests whether the\n{ingress,egress}_entry was non-NULL. However, even in midway failure on the\nreplacement, both are in fact non-NULL with a valid egress_entry from the\nprevious clsact instance.\n\nWhat we really need to test for is whether the qdisc instance-specific ingress\nor egress side previously got initialized. This adds a small helper for checking\nthe miniq initialization called mini_qdisc_pair_inited, and utilizes that upon\nclsact_destroy() in order to fix the use-after-free scenario. Convert the\ningress_destroy() side as well so both are consistent to each other.",
  "id": "CVE-2026-23413",
  "modified": "2026-07-15T01:49:06.129541192Z",
  "published": "2026-04-02T11:40:54.384Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0509b762bc5e8ea7b8391130730c6d8502fc6e69"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/37bef86e5428d59f70a4da82b80f9a8f252fecbe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4c9af67f99aa3e51b522c54968ab3ac8272be41c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a0671125d4f55e1e98d9bde8a0b671941987e208"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a73d95b57bf9faebdfed591bcb7ed9292062a84c"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23413.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23413"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "clsact: Fix use-after-free in init/destroy rollback asymmetry"
}