{
  "cveId": "CVE-2026-74715",
  "url": "https://patchblox.com/security/cve/CVE-2026-74715",
  "summary": "CVE-2026-74715 is fixed in 15 products on 1 platform, first by DEBIAN-CVE-2026-74715, released September 4, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "bpf: Fix netns reference imbalance in conntrack kfuncs",
  "description": "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\u002B0x52c/0x1700   Call Trace:    __sys_bpf\u002B0x1662/0x50c0    __x64_sys_bpf\u002B0x73/0xb0    do_syscall_64\u002B0xf9/0x540    entry_SYSCALL_64_after_hwframe\u002B0x77/0x7f   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.",
  "published": "2026-08-22T16:16:46Z",
  "severity": "Moderate",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00129,
  "epssPercentile": 0.02591,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74715",
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  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}