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GHSA-6R74-CC8Q-38C5

Vulnerability from github – Published: 2026-09-04 18:31 – Updated: 2026-09-04 18:31
VLAI
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80791"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-04T16:18:05Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-6r74-cc8q-38c5",
  "modified": "2026-09-04T18:31:26Z",
  "published": "2026-09-04T18:31:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80791"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1d6837d98bf966a041af65de5f78de7409ff83bc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2dcc9226203da7275a9c29d20007da278d73d5e9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3ddcfb013322aa37eaa7a0d344b73079c38dfa21"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/447b668faa14710f611e714031e3739ac3ec3a4f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8f6363c8d54dde95982f0ab45e77cf57ec0efd62"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b26189d28442183a8b5edb754f4a6918f77ca84e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dfcf013f77709ebdb282767edc2795a37cab5b57"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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