nvme-tcp: fix usage of page_frag_cache

{
  "id": "bb5174e1e1d075fd4f6d80305f176397a0ade9ee24dbe60ced5dddfdb0a35d82",
  "url": "https://osv.dev/vulnerability/CVE-2026-80862",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "nvme-tcp: fix usage of page_frag_cache",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: fix usage of page_frag_cache nvme uses page_frag_cache to preallocate PDU for each preallocated request of block device. Block devices are created in parallel threads, consequently page_frag_cache is used in not thread-safe manner. That leads to incorrect refcounting of backstore pages and premature free. That can be catched by !sendpage_ok inside network stack: WARNING: CPU: 7 PID: 467 at ../net/core/skbuff.c:6931 skb_splice_from_iter+0xfa/0x310. tcp_sendmsg_locked+0x782/0xce0 tcp_sendmsg+0x27/0x40 sock_sendmsg+0x8b/0xa0 nvme_tcp_try_send_cmd_pdu+0x149/0x2a0 Then random panic may occur. Fix that by serializing the usage of page_frag_cache.",
    "evidence": "osv:CVE-2026-80862",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.12.108",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.18.49",
            "evidence": "/affected/1/ranges"
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          {
            "value": "7.1.13",
            "evidence": "/affected/1/ranges"
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          {
            "value": "7.2.3",
            "evidence": "/affected/1/ranges"
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    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-80862",
      "aliases": [
        "CVE-2026-80862"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80862.json"
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      ],
      "modified": "2026-10-28T02:30:26.354183603Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0a9750263ffacbbd2048a391fd4bd22e2146c57d",
        "https://git.kernel.org/stable/c/36ac05f7cfd59d90c597071304b14e98090d5dd1",
        "https://git.kernel.org/stable/c/64561afb42d8390695bf810d9bbd087cbca00291",
        "https://git.kernel.org/stable/c/6e4cf281558709b92ec2ca3054fe2ffc69266ef9",
        "https://git.kernel.org/stable/c/d19f98c79f1b7e09e4cdf5c20d626e571e487467",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80862.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80862",
        "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/2026/80xxx/CVE-2026-80862.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-80862",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 493049,
  "published_at": "2026-09-04T15:55:16.653+00:00"
}