CVE-2026-80791 (GCVE-0-2026-80791)
Vulnerability from cvelistv5
Published
2026-09-04 15:13
Modified
2026-10-19 08:43
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nvmet-auth: zero the AUTH_RECEIVE response buffer nvmet_execute_auth_receive() allocates the response buffer with kmalloc() sized by the host-supplied AUTH_RECEIVE allocation length, but the DH-HMAC-CHAP builders write only a fixed-size message into it. The full allocation length is then copied to the wire by nvmet_copy_to_sgl(), so a remote initiator receives the bytes past the built message -- up to nearly a page of uninitialized slab -- during the pre-authentication handshake. Allocate the buffer with kzalloc() so the unwritten tail is zeroed before it is sent; conforming responses are unaffected.
References
Impacted products
Vendor Product Version
Linux Linux Version: db1312dd95488b5e6ff362ff66fcf953a46b1821
Version: db1312dd95488b5e6ff362ff66fcf953a46b1821
Version: db1312dd95488b5e6ff362ff66fcf953a46b1821
Version: db1312dd95488b5e6ff362ff66fcf953a46b1821
Version: db1312dd95488b5e6ff362ff66fcf953a46b1821
Version: db1312dd95488b5e6ff362ff66fcf953a46b1821
Version: db1312dd95488b5e6ff362ff66fcf953a46b1821
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{
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          "programFiles": [
            "drivers/nvme/target/fabrics-cmd-auth.c"
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-auth: zero the AUTH_RECEIVE response buffer\n\nnvmet_execute_auth_receive() allocates the response buffer with kmalloc()\nsized by the host-supplied AUTH_RECEIVE allocation length, but the\nDH-HMAC-CHAP builders write only a fixed-size message into it. The full\nallocation length is then copied to the wire by nvmet_copy_to_sgl(), so a\nremote initiator receives the bytes past the built message -- up to nearly\na page of uninitialized slab -- during the pre-authentication handshake.\n\nAllocate the buffer with kzalloc() so the unwritten tail is zeroed before\nit is sent; conforming responses are unaffected."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:43:44.536Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/447b668faa14710f611e714031e3739ac3ec3a4f"
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          "url": "https://git.kernel.org/stable/c/8f6363c8d54dde95982f0ab45e77cf57ec0efd62"
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          "url": "https://git.kernel.org/stable/c/2dcc9226203da7275a9c29d20007da278d73d5e9"
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          "url": "https://git.kernel.org/stable/c/1d6837d98bf966a041af65de5f78de7409ff83bc"
        },
        {
          "url": "https://git.kernel.org/stable/c/3ddcfb013322aa37eaa7a0d344b73079c38dfa21"
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      "title": "nvmet-auth: zero the AUTH_RECEIVE response buffer",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80791",
    "datePublished": "2026-09-04T15:13:03.204Z",
    "dateReserved": "2026-08-26T14:34:25.793Z",
    "dateUpdated": "2026-10-19T08:43:44.536Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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