GHSA-8HHG-GC4J-P2Q8

Vulnerability from github – Published: 2026-09-17 18:31 – Updated: 2026-10-30 15:33
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

NFSv4.1: zero referring call lists before decoding

decode_cb_sequence_args() allocates csa_rclists with kmalloc_objs(), so each referring_call_list starts uninitialized. decode_rc_list() assigns rcl_refcalls only when rcl_nrefcalls is nonzero. A valid list with zero referring calls therefore leaves the pointer uninitialized, and nfs4_callback_sequence() later passes stale slab contents to kfree().

Allocate csa_rclists with kzalloc_objs() so every rcl_refcalls member is NULL from the beginning, including valid empty referring call lists.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-90104"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:17:02Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4.1: zero referring call lists before decoding\n\ndecode_cb_sequence_args() allocates csa_rclists with kmalloc_objs(), so\neach referring_call_list starts uninitialized. decode_rc_list() assigns\nrcl_refcalls only when rcl_nrefcalls is nonzero. A valid list with zero\nreferring calls therefore leaves the pointer uninitialized, and\nnfs4_callback_sequence() later passes stale slab contents to kfree().\n\nAllocate csa_rclists with kzalloc_objs() so every rcl_refcalls member is\nNULL from the beginning, including valid empty referring call lists.",
  "id": "GHSA-8hhg-gc4j-p2q8",
  "modified": "2026-10-30T15:33:31Z",
  "published": "2026-09-17T18:31:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90104"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7510a5b9edec9d9536a4e69f10edfb2592e6cf7f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/810f6b3a29ac96fdc16909132b31627dae6824c2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8fa4804fe62ca4155a2d8fc2789d630376cbf2fc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed54460caf5b5aa65ec03c9a6032d831f39f19f5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f31f3c042e024aef437cda42f0424ae8d4594b6c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f4d23937e1c41995c2f54af26c89b5e48a41c299"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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