{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/ipset/ip_set_hash_gen.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c940d1b96248c3081b664ede5418078bdc7c8c07",
              "status": "affected",
              "version": "f66ee0410b1c3481ee75e5db9b34547b4d582465",
              "versionType": "git"
            },
            {
              "lessThan": "12088da6add5b003657c8506c5b0fcef835083b8",
              "status": "affected",
              "version": "f66ee0410b1c3481ee75e5db9b34547b4d582465",
              "versionType": "git"
            },
            {
              "lessThan": "c78bd5195a5998094a5866df702fbeafda60dafb",
              "status": "affected",
              "version": "f66ee0410b1c3481ee75e5db9b34547b4d582465",
              "versionType": "git"
            },
            {
              "lessThan": "4a597a87e2e2f608edb6be2c510dc826b4fdfb53",
              "status": "affected",
              "version": "f66ee0410b1c3481ee75e5db9b34547b4d582465",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5dd9488ae41070b69d2f4acb580f77db5705f9ca",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a469bab3386aebff33c59506f3a95e35b91118fd",
              "versionType": "git"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.24",
              "versionType": "semver"
            },
            {
              "lessThan": "5.6",
              "status": "affected",
              "version": "5.5.8",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/ipset/ip_set_hash_gen.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.6"
            },
            {
              "lessThan": "5.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.4.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.5.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ipset: make sure gc is properly stopped\n\nSashiko noticed that when destroying a set,\ncancel_delayed_work_sync() was called while gc\ncalls queue_delayed_work() unconditionally which\ncan lead not to properly shutting down the gc."
        }
      ],
      "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 bug is reached only via NFNETLINK ipset destroy/cleanup (IPSET_CMD_DESTROY or netns exit calling cancel_gc), not by processing remote packets; all entry points are local netlink syscalls into net/netfilter/ipset.\nAC:L - An attacker with CAP_NET_ADMIN creates a timeout hash ipset, waits for the workqueue GC to run, then destroys the set; because mtype_gc always re-queues itself at the end of execution, cancel_delayed_work_sync reliably leaves a pending GC after teardown.\nPR:L - All ipset management, including set destroy that calls mtype_cancel_gc, requires CAP_NET_ADMIN checked by netlink_net_capable in nfnetlink; unprivileged users can obtain this in an isolated user+network namespace via unshare -Urn.\nUI:N - Exploitation is fully automated through netlink ipset create/destroy commands and does not require any victim user action such as mounting filesystems or opening files.\nS:U - The use-after-free corrupts kernel heap memory within the same host kernel security boundary; it does not by itself cross VM, container runtime, or IOMMU isolation boundaries.\nC:H - After teardown, the orphaned GC work dereferences freed ip_set and htype structures (including embedded delayed_work), a classic slab UAF that enables heap grooming and arbitrary kernel memory disclosure.\nI:H - UAF on ipset hash control structures and hbucket data allows corrupting freed heap objects and building write primitives for control-flow hijacking and local privilege escalation beyond the caller\u0027s namespace.\nA:H - Dereferencing freed set, htype, and hash table memory from the GC workqueue can immediately trigger kernel oopses or panics, and the bug is repeatable on every destroy of a timeout hash ipset."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:44:09.822Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c940d1b96248c3081b664ede5418078bdc7c8c07"
        },
        {
          "url": "https://git.kernel.org/stable/c/12088da6add5b003657c8506c5b0fcef835083b8"
        },
        {
          "url": "https://git.kernel.org/stable/c/c78bd5195a5998094a5866df702fbeafda60dafb"
        },
        {
          "url": "https://git.kernel.org/stable/c/4a597a87e2e2f608edb6be2c510dc826b4fdfb53"
        }
      ],
      "title": "netfilter: ipset: make sure gc is properly stopped",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72434",
    "datePublished": "2026-08-15T05:56:48.756Z",
    "dateReserved": "2026-08-09T03:40:39.929Z",
    "dateUpdated": "2026-08-17T05:44:09.822Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}