ice: fix race condition in TX timestamp ring cleanup

{
  "id": "ef3db6782d8893e75fa80a42dd106ff4e5e61b425f39d73b74ec2efb16157c2d",
  "url": "https://osv.dev/vulnerability/CVE-2026-53008",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ice: fix race condition in TX timestamp ring cleanup",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ice: fix race condition in TX timestamp ring cleanup Fix a race condition between ice_free_tx_tstamp_ring() and ice_tx_map() that can cause a NULL pointer dereference. ice_free_tx_tstamp_ring currently clears the ICE_TX_FLAGS_TXTIME flag after NULLing the tstamp_ring. This could allow a concurrent ice_tx_map call on another CPU to dereference the tstamp_ring, which could lead to a NULL pointer dereference. CPU A:ice_free_tx_tstamp_ring() | CPU B:ice_tx_map() --------------------------------|--------------------------------- tx_ring->tstamp_ring = NULL | | ice_is_txtime_cfg() -> true | tstamp_ring = tx_ring->tstamp_ring | tstamp_ring->count // NULL deref! flags &= ~ICE_TX_FLAGS_TXTIME | Fix by: 1. Reordering ice_free_tx_tstamp_ring() to clear the flag before NULLing the pointer, with smp_wmb() to ensure proper ordering. 2. Adding smp_rmb() in ice_tx_map() after the flag check to order the flag read before the pointer read, using READ_ONCE() for the pointer, and adding a NULL check as a safety net. 3. Converting tx_ring->flags from u8 to DECLARE_BITMAP() and using atomic bitops (set_bit(), clear_bit(), test_bit()) for all flag operations throughout the driver: - ICE_TX_RING_FLAGS_XDP - ICE_TX_RING_FLAGS_VLAN_L2TAG1 - ICE_TX_RING_FLAGS_VLAN_L2TAG2 - ICE_TX_RING_FLAGS_TXTIME",
    "evidence": "osv:CVE-2026-53008",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.57",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-53008",
      "aliases": [
        "CVE-2026-53008"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "ccde82e909467abdf098a8ee6f63e1ecf9a47ce5"
                },
                {
                  "fixed": "e98cea6d5562f546482fab8ad571e95e3fff1800"
                },
                {
                  "fixed": "097409d20465723283632515df73038a4a853eda"
                },
                {
                  "fixed": "7c72ec18c2a4111204c2e915f8e4f6d849ce9398"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53008.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.18.0"
                },
                {
                  "fixed": "6.18.57"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53008.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:40.334840134Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/097409d20465723283632515df73038a4a853eda",
        "https://git.kernel.org/stable/c/7c72ec18c2a4111204c2e915f8e4f6d849ce9398",
        "https://git.kernel.org/stable/c/e98cea6d5562f546482fab8ad571e95e3fff1800",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53008.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53008",
        "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/2026/53xxx/CVE-2026-53008.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53008",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 507878,
  "published_at": "2026-06-24T16:29:19.459+00:00"
}