{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-50047",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-50047"
  ],
  "published": "2024-10-21T19:40:44Z",
  "summary": "smb: client: fix UAF in async decryption",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix UAF in async decryption\n\nDoing an async decryption (large read) crashes with a\nslab-use-after-free way down in the crypto API.\n\nReproducer:\n    # mount.cifs -o ...,seal,esize=1 //srv/share /mnt\n    # dd if=/mnt/largefile of=/dev/null\n    ...\n    [  194.196391] ==================================================================\n    [  194.196844] BUG: KASAN: slab-use-after-free in gf128mul_4k_lle+0xc1/0x110\n    [  194.197269] Read of size 8 at addr ffff888112bd0448 by task kworker/u77:2/899\n    [  194.197707]\n    [  194.197818] CPU: 12 UID: 0 PID: 899 Comm: kworker/u77:2 Not tainted 6.11.0-lku-00028-gfca3ca14a17a-dirty #43\n    [  194.198400] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.2-3-gd478f380-prebuilt.qemu.org 04/01/2014\n    [  194.199046] Workqueue: smb3decryptd smb2_decrypt_offload [cifs]\n    [  194.200032] Call Trace:\n    [  194.200191]  <TASK>\n    [  194.200327]  dump_stack_lvl+0x4e/0x70\n    [  194.200558]  ? gf128mul_4k_lle+0xc1/0x110\n    [  194.200809]  print_report+0x174/0x505\n    [  194.201040]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n    [  194.201352]  ? srso_return_thunk+0x5/0x5f\n    [  194.201604]  ? __virt_addr_valid+0xdf/0x1c0\n    [  194.201868]  ? gf128mul_4k_lle+0xc1/0x110\n    [  194.202128]  kasan_report+0xc8/0x150\n    [  194.202361]  ? gf128mul_4k_lle+0xc1/0x110\n    [  194.202616]  gf128mul_4k_lle+0xc1/0x110\n    [  194.202863]  ghash_update+0x184/0x210\n    [  194.203103]  shash_ahash_update+0x184/0x2a0\n    [  194.203377]  ? __pfx_shash_ahash_update+0x10/0x10\n    [  194.203651]  ? srso_return_thunk+0x5/0x5f\n    [  194.203877]  ? crypto_gcm_init_common+0x1ba/0x340\n    [  194.204142]  gcm_hash_assoc_remain_continue+0x10a/0x140\n    [  194.204434]  crypt_message+0xec1/0x10a0 [cifs]\n    [  194.206489]  ? __pfx_crypt_message+0x10/0x10 [cifs]\n    [  194.208507]  ? srso_return_thunk+0x5/0x5f\n    [  194.209205]  ? srso_return_thunk+0x5/0x5f\n    [  194.209925]  ? srso_return_thunk+0x5/0x5f\n    [  194.210443]  ? srso_return_thunk+0x5/0x5f\n    [  194.211037]  decrypt_raw_data+0x15f/0x250 [cifs]\n    [  194.212906]  ? __pfx_decrypt_raw_data+0x10/0x10 [cifs]\n    [  194.214670]  ? srso_return_thunk+0x5/0x5f\n    [  194.215193]  smb2_decrypt_offload+0x12a/0x6c0 [cifs]\n\nThis is because TFM is being used in parallel.\n\nFix this by allocating a new AEAD TFM for async decryption, but keep\nthe existing one for synchronous READ cases (similar to what is done\nin smb3_calc_signature()).\n\nAlso remove the calls to aead_request_set_callback() and\ncrypto_wait_req() since it's always going to be a synchronous operation.",
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-50047"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8f14a476abba13144df5434871a7225fd29af633"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ef51c0d544b1518b35364480317ab6d3468f205d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bce966530fd5542bbb422cb45ecb775f7a1a6bc3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0809fb86ad13b29e1d6d491364fc7ea4fb545995"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/538c26d9bf70c90edc460d18c81008a4e555925a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b0abcd65ec545701b8793e12bc27dc98042b151a"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z"
  }
}