CVE-2026-93134 (GCVE-0-2026-93134)
Vulnerability from cvelistv5
Published
2026-09-17 16:11
Modified
2026-10-19 09:06
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: printk: Fix possible console use-after-free When emitting a record via legacy printing, it is possible that a handover to another legacy printing context occurs. When a context has performed a handover, the console SRCU read lock is released and the pointer to the console struct might now be invalid. Therefore, after calling nbcon_legacy_emit_next_record() or console_emit_next_record(), it is necessary to check if a handover occurred _before_ further @con usage. Sashiko pointed out that console_flush_one_record() was not doing this. In console_flush_one_record(), after emitting a record, move the further usage of @con after the handover check.
References
Impacted products
Vendor Product Version
Linux Linux Version: c158834b223fbfab3a14855ac203b8d9cddbbefd
Version: c158834b223fbfab3a14855ac203b8d9cddbbefd
Version: c158834b223fbfab3a14855ac203b8d9cddbbefd
Version: c158834b223fbfab3a14855ac203b8d9cddbbefd
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/printk/printk.c"
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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\nprintk: Fix possible console use-after-free\n\nWhen emitting a record via legacy printing, it is possible that a handover\nto another legacy printing context occurs. When a context has performed a\nhandover, the console SRCU read lock is released and the pointer to the\nconsole struct might now be invalid. Therefore, after calling\nnbcon_legacy_emit_next_record() or console_emit_next_record(), it is\nnecessary to check if a handover occurred _before_ further @con usage.\n\nSashiko pointed out that console_flush_one_record() was not doing this.\n\nIn console_flush_one_record(), after emitting a record, move the further\nusage of @con after the handover check."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:06:07.190Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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        },
        {
          "url": "https://git.kernel.org/stable/c/36630cafbeede0b64c370edb2f7b4094327ee1e0"
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      "title": "printk: Fix possible console use-after-free",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93134",
    "datePublished": "2026-09-17T16:11:36.077Z",
    "dateReserved": "2026-09-17T16:02:15.087Z",
    "dateUpdated": "2026-10-19T09:06:07.190Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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