ghsa-69f6-7cp5-89jr
Vulnerability from github
Published
2025-12-16 15:30
Modified
2025-12-16 15:30
Details

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

sysfs: check visibility before changing group attribute ownership

Since commit 0c17270f9b92 ("net: sysfs: Implement is_visible for phys_(port_id, port_name, switch_id)"), __dev_change_net_namespace() can hit WARN_ON() when trying to change owner of a file that isn't visible. See the trace below:

WARNING: CPU: 6 PID: 2938 at net/core/dev.c:12410 __dev_change_net_namespace+0xb89/0xc30 CPU: 6 UID: 0 PID: 2938 Comm: incusd Not tainted 6.17.1-1-mainline #1 PREEMPT(full) 4b783b4a638669fb644857f484487d17cb45ed1f Hardware name: Framework Laptop 13 (AMD Ryzen 7040Series)/FRANMDCP07, BIOS 03.07 02/19/2025 RIP: 0010:__dev_change_net_namespace+0xb89/0xc30 [...] Call Trace: ? if6_seq_show+0x30/0x50 do_setlink.isra.0+0xc7/0x1270 ? __nla_validate_parse+0x5c/0xcc0 ? security_capable+0x94/0x1a0 rtnl_newlink+0x858/0xc20 ? update_curr+0x8e/0x1c0 ? update_entity_lag+0x71/0x80 ? sched_balance_newidle+0x358/0x450 ? psi_task_switch+0x113/0x2a0 ? __pfx_rtnl_newlink+0x10/0x10 rtnetlink_rcv_msg+0x346/0x3e0 ? sched_clock+0x10/0x30 ? __pfx_rtnetlink_rcv_msg+0x10/0x10 netlink_rcv_skb+0x59/0x110 netlink_unicast+0x285/0x3c0 ? __alloc_skb+0xdb/0x1a0 netlink_sendmsg+0x20d/0x430 _syssendmsg+0x39f/0x3d0 ? import_iovec+0x2f/0x40 _sys_sendmsg+0x99/0xe0 __sys_sendmsg+0x8a/0xf0 do_syscall_64+0x81/0x970 ? __sys_bind+0xe3/0x110 ? syscall_exit_work+0x143/0x1b0 ? do_syscall_64+0x244/0x970 ? sock_alloc_file+0x63/0xc0 ? syscall_exit_work+0x143/0x1b0 ? do_syscall_64+0x244/0x970 ? alloc_fd+0x12e/0x190 ? put_unused_fd+0x2a/0x70 ? do_sys_openat2+0xa2/0xe0 ? syscall_exit_work+0x143/0x1b0 ? do_syscall_64+0x244/0x970 ? exc_page_fault+0x7e/0x1a0 entry_SYSCALL_64_after_hwframe+0x76/0x7e [...]

Fix this by checking is_visible() before trying to touch the attribute.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-40355"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-16T14:15:47Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsysfs: check visibility before changing group attribute ownership\n\nSince commit 0c17270f9b92 (\"net: sysfs: Implement is_visible for\nphys_(port_id, port_name, switch_id)\"), __dev_change_net_namespace() can\nhit WARN_ON() when trying to change owner of a file that isn\u0027t visible.\nSee the trace below:\n\n WARNING: CPU: 6 PID: 2938 at net/core/dev.c:12410 __dev_change_net_namespace+0xb89/0xc30\n CPU: 6 UID: 0 PID: 2938 Comm: incusd Not tainted 6.17.1-1-mainline #1 PREEMPT(full)  4b783b4a638669fb644857f484487d17cb45ed1f\n Hardware name: Framework Laptop 13 (AMD Ryzen 7040Series)/FRANMDCP07, BIOS 03.07 02/19/2025\n RIP: 0010:__dev_change_net_namespace+0xb89/0xc30\n [...]\n Call Trace:\n  \u003cTASK\u003e\n  ? if6_seq_show+0x30/0x50\n  do_setlink.isra.0+0xc7/0x1270\n  ? __nla_validate_parse+0x5c/0xcc0\n  ? security_capable+0x94/0x1a0\n  rtnl_newlink+0x858/0xc20\n  ? update_curr+0x8e/0x1c0\n  ? update_entity_lag+0x71/0x80\n  ? sched_balance_newidle+0x358/0x450\n  ? psi_task_switch+0x113/0x2a0\n  ? __pfx_rtnl_newlink+0x10/0x10\n  rtnetlink_rcv_msg+0x346/0x3e0\n  ? sched_clock+0x10/0x30\n  ? __pfx_rtnetlink_rcv_msg+0x10/0x10\n  netlink_rcv_skb+0x59/0x110\n  netlink_unicast+0x285/0x3c0\n  ? __alloc_skb+0xdb/0x1a0\n  netlink_sendmsg+0x20d/0x430\n  ____sys_sendmsg+0x39f/0x3d0\n  ? import_iovec+0x2f/0x40\n  ___sys_sendmsg+0x99/0xe0\n  __sys_sendmsg+0x8a/0xf0\n  do_syscall_64+0x81/0x970\n  ? __sys_bind+0xe3/0x110\n  ? syscall_exit_work+0x143/0x1b0\n  ? do_syscall_64+0x244/0x970\n  ? sock_alloc_file+0x63/0xc0\n  ? syscall_exit_work+0x143/0x1b0\n  ? do_syscall_64+0x244/0x970\n  ? alloc_fd+0x12e/0x190\n  ? put_unused_fd+0x2a/0x70\n  ? do_sys_openat2+0xa2/0xe0\n  ? syscall_exit_work+0x143/0x1b0\n  ? do_syscall_64+0x244/0x970\n  ? exc_page_fault+0x7e/0x1a0\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n [...]\n  \u003c/TASK\u003e\n\nFix this by checking is_visible() before trying to touch the attribute.",
  "id": "GHSA-69f6-7cp5-89jr",
  "modified": "2025-12-16T15:30:43Z",
  "published": "2025-12-16T15:30:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40355"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ac2c526e103285d80a0330b91a318f6c9276d35a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c7fbb8218b4ad35fec0bd2256d2b9c8d60331f33"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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