net: sparx5: fix sleep in atomic context in MAC table access

{
  "id": "26f61047b823b44ad48d24e804e46b5785b3d5cec808992b7624681e385668f1",
  "url": "https://osv.dev/vulnerability/CVE-2026-90098",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: sparx5: fix sleep in atomic context in MAC table access",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: sparx5: fix sleep in atomic context in MAC table access sparx5_set_rx_mode() runs with netif_addr_lock_bh held and iterates dev->mc via __dev_mc_sync(), which per address calls sparx5_mc_sync() / sparx5_mc_unsync() -> sparx5_mact_learn() / sparx5_mact_forget(). These take sparx5->lock, a mutex, and then poll the MAC access command register with readx_poll_timeout(). A mutex may block, which is not allowed from atomic context. Convert the driver to the new .ndo_set_rx_mode_async callback introduced in commit 3554b4345d85 (\"net: introduce ndo_set_rx_mode_async and netdev_rx_mode_work\"). The async callback is invoked from process context, so the mutex and sleeping completion poll can remain. Observed with CONFIG_PROVE_LOCKING, CONFIG_DEBUG_SPINLOCK, CONFIG_DEBUG_MUTEXES and CONFIG_DEBUG_ATOMIC_SLEEP enabled: BUG: sleeping function called from invalid context at kernel/locking/mutex.c:591 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 217, name: ip preempt_count: 201, expected: 0 Call trace: __might_resched+0x144/0x248 __might_sleep+0x48/0x7c __mutex_lock+0x74/0x850 mutex_lock_nested+0x24/0x30 sparx5_mact_learn+0x78/0x100 sparx5_mc_sync+0x40/0x54 __hw_addr_sync_dev+0xc4/0x170 sparx5_set_rx_mode+0x4c/0x58 __dev_set_rx_mode+0x64/0xa4 __dev_open+0x1ec/0x26c",
    "evidence": "osv:CVE-2026-90098",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-90098",
      "aliases": [
        "CVE-2026-90098"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "d6fce5141929697a27f029c633433d487f6f62cb"
                },
                {
                  "fixed": "648d196ccc03ae3b04402ae71ffa44959a85e88f"
                },
                {
                  "fixed": "b62793a7baeea9cf20209c9fd2e333311aaf3b8d"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90098.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.14.0"
                },
                {
                  "fixed": "7.2.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90098.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.214289674Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/648d196ccc03ae3b04402ae71ffa44959a85e88f",
        "https://git.kernel.org/stable/c/b62793a7baeea9cf20209c9fd2e333311aaf3b8d",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90098.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90098",
        "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/2026/90xxx/CVE-2026-90098.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-90098",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 494976,
  "published_at": "2026-09-17T16:06:10.203+00:00"
}