{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.187-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.105-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.9-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux-6.12"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.107-1~deb12u1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  netfilter: ebt_nflog: pin the NFLOG backend  nf_log_unregister() runs after the per-net teardown so its final RCU grace period also drains readers that obtained the logger from a per-net binding.  However, ebt_nflog passes an explicit ULOG log type to nf_log_packet() without holding a reference on the selected logger module, unlike the xt_NFLOG and nft_log frontends.  An ebtables nflog rule can therefore remain callable while nfnetlink_log is unloaded.  The resulting interleaving is:    CPU 0                               CPU 1   nfnetlink_log_fini()     unregister_pernet_subsys()       kfree(nfnl_log_pernet(net))                                       ebt_nflog_tg()                                         nf_log_packet()                                           nfulnl_log_packet()                                             instance_lookup_get_rcu()  The global ULOG logger is still registered at this point, so CPU 1 dereferences the per-net state after CPU 0 has freed it.  KASAN reported:    BUG: KASAN: slab-use-after-free in instance_lookup_get_rcu   Read of size 8 at addr ff110001052e6210 by task poc/92   Call Trace:    instance_lookup_get_rcu+0x1ce/0x1f0 [nfnetlink_log]    nfulnl_log_packet+0x248/0x2fb0 [nfnetlink_log]    nf_log_packet+0x204/0x300    ebt_nflog_tg+0x351/0x550    ebt_do_table+0xedf/0x22b0   Allocated by task 90:    __kmalloc_noprof+0x186/0x470    ops_init+0x6d/0x420    register_pernet_operations+0x2f6/0x670    register_pernet_subsys+0x23/0x40   Freed by task 93:    kfree+0x131/0x3c0    ops_undo_list+0x3e3/0x700    unregister_pernet_operations+0x232/0x490    unregister_pernet_subsys+0x1c/0x30    nfnetlink_log_fini+0x34/0x450 [nfnetlink_log]  Acquire the ULOG logger module reference when an ebt_nflog rule is validated and release it when the rule is destroyed.  Request the NFLOG backend for legacy callers when needed, matching xt_NFLOG.  This prevents module teardown until all ebt_nflog rules have stopped using the logger.",
  "id": "DEBIAN-CVE-2026-74660",
  "modified": "2026-09-19T21:47:26.390737141Z",
  "published": "2026-08-22T16:16:39.743Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-74660"
    }
  ],
  "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-2026-74660"
  ]
}