{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "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"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  bpf: Fix netns reference imbalance in conntrack kfuncs  The opts argument of the BPF conntrack kfuncs can point to a shared map value.  __bpf_nf_ct_lookup() and __bpf_nf_ct_alloc_entry() read opts-\u003enetns_id separately when acquiring and releasing the network namespace reference.  The reference imbalance can occur as follows:    CPU 0                                  CPU 1   read opts-\u003enetns_id (-1)   skip get_net_ns_by_id()                                          write opts-\u003enetns_id (id)   read opts-\u003enetns_id (id)   put_net(net) /* no matching get */  The reverse transition leaks the reference.  Repeating the unmatched put can destroy a live namespace and crash later users.  The kernel reported:    Oops: general protection fault, probably for non-canonical address   KASAN: null-ptr-deref in range [0x00000000000000e8-0x00000000000000ef]   RIP: 0010:bpf_prog_test_run_xdp+0x52c/0x1700   Call Trace:    __sys_bpf+0x1662/0x50c0    __x64_sys_bpf+0x73/0xb0    do_syscall_64+0xf9/0x540    entry_SYSCALL_64_after_hwframe+0x77/0x7f   Kernel panic - not syncing: Fatal exception  Snapshot every input field of opts with READ_ONCE() before validating or using it.  The netns_id snapshot keeps the namespace get/put pair balanced, while the other snapshots keep the remaining options from changing partway through an invocation.  The individual reads can still observe an inconsistent combination during a concurrent update, but each selected field value remains stable for that invocation.",
  "id": "DEBIAN-CVE-2026-74715",
  "modified": "2026-09-14T16:47:46.285747574Z",
  "published": "2026-08-22T16:16:46.313Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-74715"
    }
  ],
  "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-2026-74715"
  ]
}