wifi: mac80211: fix general-protection-fault in ieee80211_subif_start_xmit()

{
  "id": "1412a3dce44ad4449906ae59cdd4ef4392265d1c01865eadb93d7ff0e669a9c4",
  "url": "https://osv.dev/vulnerability/CVE-2022-49876",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wifi: mac80211: fix general-protection-fault in ieee80211_subif_start_xmit()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: fix general-protection-fault in ieee80211_subif_start_xmit() When device is running and the interface status is changed, the gpf issue is triggered. The problem triggering process is as follows: Thread A: Thread B ieee80211_runtime_change_iftype() process_one_work() ... ... ieee80211_do_stop() ... ... ... sdata->bss = NULL ... ... ieee80211_subif_start_xmit() ieee80211_multicast_to_unicast //!sdata->bss->multicast_to_unicast cause gpf issue When the interface status is changed, the sending queue continues to send packets. After the bss is set to NULL, the bss is accessed. As a result, this causes a general-protection-fault issue. The following is the stack information: general protection fault, probably for non-canonical address 0xdffffc000000002f: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000178-0x000000000000017f] Workqueue: mld mld_ifc_work RIP: 0010:ieee80211_subif_start_xmit+0x25b/0x1310 Call Trace: dev_hard_start_xmit+0x1be/0x990 __dev_queue_xmit+0x2c9a/0x3b60 ip6_finish_output2+0xf92/0x1520 ip6_finish_output+0x6af/0x11e0 ip6_output+0x1ed/0x540 mld_sendpack+0xa09/0xe70 mld_ifc_work+0x71c/0xdb0 process_one_work+0x9bf/0x1710 worker_thread+0x665/0x1080 kthread+0x2e4/0x3a0 ret_from_fork+0x1f/0x30",
    "evidence": "osv:CVE-2022-49876",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.0.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2022-49876",
      "aliases": [
        "CVE-2022-49876"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f856373e2f31ffd340e47e2b00027bd4070f74b3"
                },
                {
                  "fixed": "03eb68c72cee249aeb7af7d04a83c033aca3d6d9"
                },
                {
                  "fixed": "780854186946e0de2be192ee7fa5125666533b3a"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49876.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.19.0"
                },
                {
                  "fixed": "6.0.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49876.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.585504028Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/03eb68c72cee249aeb7af7d04a83c033aca3d6d9",
        "https://git.kernel.org/stable/c/780854186946e0de2be192ee7fa5125666533b3a",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49876.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49876",
        "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/2022/49xxx/CVE-2022-49876.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-49876",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500292,
  "published_at": "2025-05-01T14:10:25.04+00:00"
}