{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "076a0ca02644657b13e4af363f487ced2942e9cb"
            },
            {
              "fixed": "a5a89db6981a1ddf2314bf50cb49db5a3146185f"
            },
            {
              "fixed": "1c2ebdeff8d088a2e47ae25d7b38447249adace2"
            },
            {
              "fixed": "a64b7bf84b4d5ea54218c5d374ec87fff9000f43"
            },
            {
              "fixed": "2898080c054ea4d6ddfaaf21bbedbc229a9a8376"
            },
            {
              "fixed": "fd002ff2ea030cbfb0188a11b3c60ce7f84485f4"
            },
            {
              "fixed": "929f7a9a7aad9404a5867216c3f8738232355b38"
            },
            {
              "fixed": "bff0f4f06f12d6d9bc565a3e1378abd4f6f5ce36"
            },
            {
              "fixed": "35177c6877134a21315f37d57a5577846225623e"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.4.0"
            },
            {
              "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-2026-43026.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ctnetlink: zero expect NAT fields when CTA_EXPECT_NAT absent\n\nctnetlink_alloc_expect() allocates expectations from a non-zeroing\nslab cache via nf_ct_expect_alloc().  When CTA_EXPECT_NAT is not\npresent in the netlink message, saved_addr and saved_proto are\nnever initialized.  Stale data from a previous slab occupant can\nthen be dumped to userspace by ctnetlink_exp_dump_expect(), which\nchecks these fields to decide whether to emit CTA_EXPECT_NAT.\n\nThe safe sibling nf_ct_expect_init(), used by the packet path,\nexplicitly zeroes these fields.\n\nZero saved_addr, saved_proto and dir in the else branch, guarded\nby IS_ENABLED(CONFIG_NF_NAT) since these fields only exist when\nNAT is enabled.\n\nConfirmed by priming the expect slab with NAT-bearing expectations,\nfreeing them, creating a new expectation without CTA_EXPECT_NAT,\nand observing that the ctnetlink dump emits a spurious\nCTA_EXPECT_NAT containing stale data from the prior allocation.",
  "id": "CVE-2026-43026",
  "modified": "2026-07-08T05:38:22.824423177Z",
  "published": "2026-05-01T14:15:27.854Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1c2ebdeff8d088a2e47ae25d7b38447249adace2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2898080c054ea4d6ddfaaf21bbedbc229a9a8376"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35177c6877134a21315f37d57a5577846225623e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/929f7a9a7aad9404a5867216c3f8738232355b38"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a5a89db6981a1ddf2314bf50cb49db5a3146185f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a64b7bf84b4d5ea54218c5d374ec87fff9000f43"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bff0f4f06f12d6d9bc565a3e1378abd4f6f5ce36"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fd002ff2ea030cbfb0188a11b3c60ce7f84485f4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43026.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43026"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "netfilter: ctnetlink: zero expect NAT fields when CTA_EXPECT_NAT absent"
}