lib: alloc_tag_module_unload must wait for pending kfree_rcu calls

{
  "id": "9cf35246995717c1f472a3dbba4636d5aeb0ec1a25fb187c7f101d4c69d5132a",
  "url": "https://osv.dev/vulnerability/CVE-2024-50212",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "lib: alloc_tag_module_unload must wait for pending kfree_rcu calls",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: lib: alloc_tag_module_unload must wait for pending kfree_rcu calls Ben Greear reports following splat: ------------[ cut here ]------------ net/netfilter/nf_nat_core.c:1114 module nf_nat func:nf_nat_register_fn has 256 allocated at module unload WARNING: CPU: 1 PID: 10421 at lib/alloc_tag.c:168 alloc_tag_module_unload+0x22b/0x3f0 Modules linked in: nf_nat(-) btrfs ufs qnx4 hfsplus hfs minix vfat msdos fat ... Hardware name: Default string Default string/SKYBAY, BIOS 5.12 08/04/2020 RIP: 0010:alloc_tag_module_unload+0x22b/0x3f0 codetag_unload_module+0x19b/0x2a0 ? codetag_load_module+0x80/0x80 nf_nat module exit calls kfree_rcu on those addresses, but the free operation is likely still pending by the time alloc_tag checks for leaks. Wait for outstanding kfree_rcu operations to complete before checking resolves this warning. Reproducer: unshare -n iptables-nft -t nat -A PREROUTING -p tcp grep nf_nat /proc/allocinfo # will list 4 allocations rmmod nft_chain_nat rmmod nf_nat # will WARN. [akpm@linux-foundation.org: add comment]",
    "evidence": "osv:CVE-2024-50212",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.11.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2024-50212",
      "aliases": [
        "CVE-2024-50212"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "a473573964e51dcb6efc182f773cd3924be4a184"
                },
                {
                  "fixed": "24211fb49c9ac1b576470b7e393a5a0b50af2707"
                },
                {
                  "fixed": "dc783ba4b9df3fb3e76e968b2cbeb9960069263c"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-50212.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.10.0"
                },
                {
                  "fixed": "6.11.7"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-50212.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.021429779Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/24211fb49c9ac1b576470b7e393a5a0b50af2707",
        "https://git.kernel.org/stable/c/dc783ba4b9df3fb3e76e968b2cbeb9960069263c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50212.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-50212",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50212.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-50212",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 494553,
  "published_at": "2024-11-09T10:14:24.249+00:00"
}