CVE-2026-97963 (GCVE-0-2026-97963)
Vulnerability from cvelistv5
Published
2026-09-25 10:23
Modified
2026-10-19 09:11
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: stmmac: initialize ptp_lock at probe time priv->ptp_lock is only initialized in stmmac_ptp_register(), which runs during __stmmac_open(). However, the lock is also used while the interface is down and has never been opened: tc_taprio_configure() invokes the PTP gettime64() callback to compute the EST base time when offloading a TAPRIO schedule, and stmmac_get_time() takes priv->ptp_lock. Using an uninitialized rwlock is undefined behaviour. Move the rwlock_init() to __stmmac_dvr_probe(), together with the other private locks, so that ptp_lock is always valid regardless of the interface state.
References
Impacted products
Vendor Product Version
Linux Linux Version: b60189e0392fa06348911077ef281eb2b1047b6a
Version: b60189e0392fa06348911077ef281eb2b1047b6a
Version: b60189e0392fa06348911077ef281eb2b1047b6a
Version: b60189e0392fa06348911077ef281eb2b1047b6a
Version: b60189e0392fa06348911077ef281eb2b1047b6a
Version: b60189e0392fa06348911077ef281eb2b1047b6a
Version: b60189e0392fa06348911077ef281eb2b1047b6a
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/stmicro/stmmac/stmmac_main.c",
            "drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c"
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          "programFiles": [
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          "vendor": "Linux",
          "versions": [
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              "version": "7.2.7",
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              "version": "7.3",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: initialize ptp_lock at probe time\n\npriv-\u003eptp_lock is only initialized in stmmac_ptp_register(), which runs\nduring __stmmac_open(). However, the lock is also used while the\ninterface is down and has never been opened: tc_taprio_configure()\ninvokes the PTP gettime64() callback to compute the EST base time when\noffloading a TAPRIO schedule, and stmmac_get_time() takes\npriv-\u003eptp_lock. Using an uninitialized rwlock is undefined behaviour.\nMove the rwlock_init() to __stmmac_dvr_probe(), together with the other\nprivate locks, so that ptp_lock is always valid regardless of the\ninterface state."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:11:29.173Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ee33e424d4932c70f103b94a46b685923f236f65"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ced87834f3a58761d4bbcabf8326478548e6a54"
        },
        {
          "url": "https://git.kernel.org/stable/c/79fb5bcc50996964e076dffbdc24b7d2c06bd957"
        },
        {
          "url": "https://git.kernel.org/stable/c/420315413b29635de1d4ea4142e410e6465260f3"
        },
        {
          "url": "https://git.kernel.org/stable/c/25cc0096efba83b4e0e6fa50f03e9543b41e9d3d"
        },
        {
          "url": "https://git.kernel.org/stable/c/b1986595cf827c38ff929e22fbc9ca8f76379306"
        },
        {
          "url": "https://git.kernel.org/stable/c/0338c68e22abd2ee509ec2e32508a50896618c32"
        }
      ],
      "title": "net: stmmac: initialize ptp_lock at probe time",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97963",
    "datePublished": "2026-09-25T10:23:06.749Z",
    "dateReserved": "2026-09-25T10:18:58.206Z",
    "dateUpdated": "2026-10-19T09:11:29.173Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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