ghsa-xp7w-6352-489g
Vulnerability from github
Published
2025-05-09 09:33
Modified
2025-05-09 09:33
Details

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

netfs: Only create /proc/fs/netfs with CONFIG_PROC_FS

When testing a special config:

CONFIG_NETFS_SUPPORTS=y CONFIG_PROC_FS=n

The system crashes with something like:

[ 3.766197] ------------[ cut here ]------------ [ 3.766484] kernel BUG at mm/mempool.c:560! [ 3.766789] Oops: invalid opcode: 0000 [#1] SMP NOPTI [ 3.767123] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Tainted: G W [ 3.767777] Tainted: [W]=WARN [ 3.767968] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), [ 3.768523] RIP: 0010:mempool_alloc_slab.cold+0x17/0x19 [ 3.768847] Code: 50 fe ff 58 5b 5d 41 5c 41 5d 41 5e 41 5f e9 93 95 13 00 [ 3.769977] RSP: 0018:ffffc90000013998 EFLAGS: 00010286 [ 3.770315] RAX: 000000000000002f RBX: ffff888100ba8640 RCX: 0000000000000000 [ 3.770749] RDX: 0000000000000000 RSI: 0000000000000003 RDI: 00000000ffffffff [ 3.771217] RBP: 0000000000092880 R08: 0000000000000000 R09: ffffc90000013828 [ 3.771664] R10: 0000000000000001 R11: 00000000ffffffea R12: 0000000000092cc0 [ 3.772117] R13: 0000000000000400 R14: ffff8881004b1620 R15: ffffea0004ef7e40 [ 3.772554] FS: 0000000000000000(0000) GS:ffff8881b5f3c000(0000) knlGS:0000000000000000 [ 3.773061] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 3.773443] CR2: ffffffff830901b4 CR3: 0000000004296001 CR4: 0000000000770ef0 [ 3.773884] PKRU: 55555554 [ 3.774058] Call Trace: [ 3.774232] [ 3.774371] mempool_alloc_noprof+0x6a/0x190 [ 3.774649] ? _printk+0x57/0x80 [ 3.774862] netfs_alloc_request+0x85/0x2ce [ 3.775147] netfs_readahead+0x28/0x170 [ 3.775395] read_pages+0x6c/0x350 [ 3.775623] ? srso_alias_return_thunk+0x5/0xfbef5 [ 3.775928] page_cache_ra_unbounded+0x1bd/0x2a0 [ 3.776247] filemap_get_pages+0x139/0x970 [ 3.776510] ? srso_alias_return_thunk+0x5/0xfbef5 [ 3.776820] filemap_read+0xf9/0x580 [ 3.777054] ? srso_alias_return_thunk+0x5/0xfbef5 [ 3.777368] ? srso_alias_return_thunk+0x5/0xfbef5 [ 3.777674] ? find_held_lock+0x32/0x90 [ 3.777929] ? netfs_start_io_read+0x19/0x70 [ 3.778221] ? netfs_start_io_read+0x19/0x70 [ 3.778489] ? srso_alias_return_thunk+0x5/0xfbef5 [ 3.778800] ? lock_acquired+0x1e6/0x450 [ 3.779054] ? srso_alias_return_thunk+0x5/0xfbef5 [ 3.779379] netfs_buffered_read_iter+0x57/0x80 [ 3.779670] __kernel_read+0x158/0x2c0 [ 3.779927] bprm_execve+0x300/0x7a0 [ 3.780185] kernel_execve+0x10c/0x140 [ 3.780423] ? __pfx_kernel_init+0x10/0x10 [ 3.780690] kernel_init+0xd5/0x150 [ 3.780910] ret_from_fork+0x2d/0x50 [ 3.781156] ? __pfx_kernel_init+0x10/0x10 [ 3.781414] ret_from_fork_asm+0x1a/0x30 [ 3.781677] [ 3.781823] Modules linked in: [ 3.782065] ---[ end trace 0000000000000000 ]---

This is caused by the following error path in netfs_init():

    if (!proc_mkdir("fs/netfs", NULL))
            goto error_proc;

Fix this by adding ifdef in netfs_main(), so that /proc/fs/netfs is only created with CONFIG_PROC_FS.

Show details on source website

To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2025-37876"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-09T07:16:08Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Only create /proc/fs/netfs with CONFIG_PROC_FS\n\nWhen testing a special config:\n\nCONFIG_NETFS_SUPPORTS=y\nCONFIG_PROC_FS=n\n\nThe system crashes with something like:\n\n[    3.766197] ------------[ cut here ]------------\n[    3.766484] kernel BUG at mm/mempool.c:560!\n[    3.766789] Oops: invalid opcode: 0000 [#1] SMP NOPTI\n[    3.767123] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Tainted: G        W\n[    3.767777] Tainted: [W]=WARN\n[    3.767968] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),\n[    3.768523] RIP: 0010:mempool_alloc_slab.cold+0x17/0x19\n[    3.768847] Code: 50 fe ff 58 5b 5d 41 5c 41 5d 41 5e 41 5f e9 93 95 13 00\n[    3.769977] RSP: 0018:ffffc90000013998 EFLAGS: 00010286\n[    3.770315] RAX: 000000000000002f RBX: ffff888100ba8640 RCX: 0000000000000000\n[    3.770749] RDX: 0000000000000000 RSI: 0000000000000003 RDI: 00000000ffffffff\n[    3.771217] RBP: 0000000000092880 R08: 0000000000000000 R09: ffffc90000013828\n[    3.771664] R10: 0000000000000001 R11: 00000000ffffffea R12: 0000000000092cc0\n[    3.772117] R13: 0000000000000400 R14: ffff8881004b1620 R15: ffffea0004ef7e40\n[    3.772554] FS:  0000000000000000(0000) GS:ffff8881b5f3c000(0000) knlGS:0000000000000000\n[    3.773061] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[    3.773443] CR2: ffffffff830901b4 CR3: 0000000004296001 CR4: 0000000000770ef0\n[    3.773884] PKRU: 55555554\n[    3.774058] Call Trace:\n[    3.774232]  \u003cTASK\u003e\n[    3.774371]  mempool_alloc_noprof+0x6a/0x190\n[    3.774649]  ? _printk+0x57/0x80\n[    3.774862]  netfs_alloc_request+0x85/0x2ce\n[    3.775147]  netfs_readahead+0x28/0x170\n[    3.775395]  read_pages+0x6c/0x350\n[    3.775623]  ? srso_alias_return_thunk+0x5/0xfbef5\n[    3.775928]  page_cache_ra_unbounded+0x1bd/0x2a0\n[    3.776247]  filemap_get_pages+0x139/0x970\n[    3.776510]  ? srso_alias_return_thunk+0x5/0xfbef5\n[    3.776820]  filemap_read+0xf9/0x580\n[    3.777054]  ? srso_alias_return_thunk+0x5/0xfbef5\n[    3.777368]  ? srso_alias_return_thunk+0x5/0xfbef5\n[    3.777674]  ? find_held_lock+0x32/0x90\n[    3.777929]  ? netfs_start_io_read+0x19/0x70\n[    3.778221]  ? netfs_start_io_read+0x19/0x70\n[    3.778489]  ? srso_alias_return_thunk+0x5/0xfbef5\n[    3.778800]  ? lock_acquired+0x1e6/0x450\n[    3.779054]  ? srso_alias_return_thunk+0x5/0xfbef5\n[    3.779379]  netfs_buffered_read_iter+0x57/0x80\n[    3.779670]  __kernel_read+0x158/0x2c0\n[    3.779927]  bprm_execve+0x300/0x7a0\n[    3.780185]  kernel_execve+0x10c/0x140\n[    3.780423]  ? __pfx_kernel_init+0x10/0x10\n[    3.780690]  kernel_init+0xd5/0x150\n[    3.780910]  ret_from_fork+0x2d/0x50\n[    3.781156]  ? __pfx_kernel_init+0x10/0x10\n[    3.781414]  ret_from_fork_asm+0x1a/0x30\n[    3.781677]  \u003c/TASK\u003e\n[    3.781823] Modules linked in:\n[    3.782065] ---[ end trace 0000000000000000 ]---\n\nThis is caused by the following error path in netfs_init():\n\n        if (!proc_mkdir(\"fs/netfs\", NULL))\n                goto error_proc;\n\nFix this by adding ifdef in netfs_main(), so that /proc/fs/netfs is only\ncreated with CONFIG_PROC_FS.",
  "id": "GHSA-xp7w-6352-489g",
  "modified": "2025-05-09T09:33:20Z",
  "published": "2025-05-09T09:33:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-37876"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2ef6eea2efce01d1956ace483216f6b6e26330c9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/40cb48eba3b4b79e110c1a35d33a48cac54507a2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6c4c5e0b96a90f2a11c378e66edc1f25165e10b6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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