GHSA-FCQ8-57FG-2MM8

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-19 18:31
VLAI
Details

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

net: mana: Add NULL guards in teardown path to prevent panic on attach failure

When queue allocation fails partway through, the error cleanup frees and NULLs apc->tx_qp and apc->rxqs. Multiple teardown paths such as mana_remove(), mana_change_mtu() recovery, and internal error handling in mana_alloc_queues() can subsequently call into functions that dereference these pointers without NULL checks:

  • mana_chn_setxdp() dereferences apc->rxqs[0], causing a NULL pointer dereference panic (CR2: 0000000000000000 at mana_chn_setxdp+0x26).
  • mana_destroy_vport() iterates apc->rxqs without a NULL check.
  • mana_fence_rqs() iterates apc->rxqs without a NULL check.
  • mana_dealloc_queues() iterates apc->tx_qp without a NULL check.

Add NULL guards for apc->rxqs in mana_fence_rqs(), mana_destroy_vport(), and before the mana_chn_setxdp() call. Add a NULL guard for apc->tx_qp in mana_dealloc_queues() to skip TX queue draining when TX queues were never allocated or already freed.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-63973"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:16Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mana: Add NULL guards in teardown path to prevent panic on attach failure\n\nWhen queue allocation fails partway through, the error cleanup frees\nand NULLs apc-\u003etx_qp and apc-\u003erxqs. Multiple teardown paths such as\nmana_remove(), mana_change_mtu() recovery, and internal error handling\nin mana_alloc_queues() can subsequently call into functions that\ndereference these pointers without NULL checks:\n\n- mana_chn_setxdp() dereferences apc-\u003erxqs[0], causing a NULL pointer\n  dereference panic (CR2: 0000000000000000 at mana_chn_setxdp+0x26).\n- mana_destroy_vport() iterates apc-\u003erxqs without a NULL check.\n- mana_fence_rqs() iterates apc-\u003erxqs without a NULL check.\n- mana_dealloc_queues() iterates apc-\u003etx_qp without a NULL check.\n\nAdd NULL guards for apc-\u003erxqs in mana_fence_rqs(),\nmana_destroy_vport(), and before the mana_chn_setxdp() call. Add a\nNULL guard for apc-\u003etx_qp in mana_dealloc_queues() to skip TX queue\ndraining when TX queues were never allocated or already freed.",
  "id": "GHSA-fcq8-57fg-2mm8",
  "modified": "2026-07-19T18:31:48Z",
  "published": "2026-07-19T18:31:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63973"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a9c520fdcb1cb2e79c163c12d359b5e1ee40007"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/17bfe0a8c014ee1d542ad352cd6a0a505361664a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/26a96fa81496afe7d162d172ccdc8cb9dbc685d2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/95e414f8324385771bdfd6d497a01d5593813ccb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da7e4a1aaf397af6a094f640c92d6bc7564c10db"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da87896f34e0a51489811d1a684e2953099ca98f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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