{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.170-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.85-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.19.12-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  netfilter: nf_conntrack_helper: pass helper to expect cleanup  nf_conntrack_helper_unregister() calls nf_ct_expect_iterate_destroy() to remove expectations belonging to the helper being unregistered. However, it passes NULL instead of the helper pointer as the data argument, so expect_iter_me() never matches any expectation and all of them survive the cleanup.  After unregister returns, nfnl_cthelper_del() frees the helper object immediately.  Subsequent expectation dumps or packet-driven init_conntrack() calls then dereference the freed exp-\u003ehelper, causing a use-after-free.  Pass the actual helper pointer so expectations referencing it are properly destroyed before the helper object is freed.    BUG: KASAN: slab-use-after-free in string+0x38f/0x430   Read of size 1 at addr ffff888003b14d20 by task poc/103   Call Trace:    string+0x38f/0x430    vsnprintf+0x3cc/0x1170    seq_printf+0x17a/0x240    exp_seq_show+0x2e5/0x560    seq_read_iter+0x419/0x1280    proc_reg_read+0x1ac/0x270    vfs_read+0x179/0x930    ksys_read+0xef/0x1c0   Freed by task 103:   The buggy address is located 32 bytes inside of    freed 192-byte region [ffff888003b14d00, ffff888003b14dc0)",
  "id": "DEBIAN-CVE-2026-43027",
  "modified": "2026-09-14T16:47:45.055167780Z",
  "published": "2026-05-01T15:16:47.167Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-43027"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-43027"
  ]
}