smb: client: fix UAF in async decryption

{
  "id": "781a07ff990d9ddac9a6f9f5fd8af27f66af6910a5d98782a120f5f00017820f",
  "url": "https://osv.dev/vulnerability/CVE-2024-50047",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "smb: client: fix UAF in async decryption",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: smb: client: fix UAF in async decryption Doing an async decryption (large read) crashes with a slab-use-after-free way down in the crypto API. Reproducer: # mount.cifs -o ...,seal,esize=1 //srv/share /mnt # dd if=/mnt/largefile of=/dev/null ... [ 194.196391] ================================================================== [ 194.196844] BUG: KASAN: slab-use-after-free in gf128mul_4k_lle+0xc1/0x110 [ 194.197269] Read of size 8 at addr ffff888112bd0448 by task kworker/u77:2/899 [ 194.197707] [ 194.197818] CPU: 12 UID: 0 PID: 899 Comm: kworker/u77:2 Not tainted 6.11.0-lku-00028-gfca3ca14a17a-dirty #43 [ 194.198400] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.2-3-gd478f380-prebuilt.qemu.org 04/01/2014 [ 194.199046] Workqueue: smb3decryptd smb2_decrypt_offload [cifs] [ 194.200032] Call Trace: [ 194.200191] [ 194.200327] dump_stack_lvl+0x4e/0x70 [ 194.200558] ? gf128mul_4k_lle+0xc1/0x110 [ 194.200809] print_report+0x174/0x505 [ 194.201040] ? __pfx__raw_spin_lock_irqsave+0x10/0x10 [ 194.201352] ? srso_return_thunk+0x5/0x5f [ 194.201604] ? __virt_addr_valid+0xdf/0x1c0 [ 194.201868] ? gf128mul_4k_lle+0xc1/0x110 [ 194.202128] kasan_report+0xc8/0x150 [ 194.202361] ? gf128mul_4k_lle+0xc1/0x110 [ 194.202616] gf128mul_4k_lle+0xc1/0x110 [ 194.202863] ghash_update+0x184/0x210 [ 194.203103] shash_ahash_update+0x184/0x2a0 [ 194.203377] ? __pfx_shash_ahash_update+0x10/0x10 [ 194.203651] ? srso_return_thun",
    "evidence": "osv:CVE-2024-50047",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.237",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.181",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.128",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.57",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.11.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2024-50047",
      "aliases": [
        "CVE-2024-50047"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                },
                {
                  "fixed": "0809fb86ad13b29e1d6d491364fc7ea4fb545995"
                },
                {
                  "fixed": "538c26d9bf70c90edc460d18c81008a4e555925a"
                },
                {
                  "fixed": "b0abcd65ec545701b8793e12bc27dc98042b151a"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-50047.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.4.0"
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            {
              "type": "ECOSYSTEM",
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                {
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.2.0"
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              "events": [
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-50047.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.137496506Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0809fb86ad13b29e1d6d491364fc7ea4fb545995",
        "https://git.kernel.org/stable/c/538c26d9bf70c90edc460d18c81008a4e555925a",
        "https://git.kernel.org/stable/c/8f14a476abba13144df5434871a7225fd29af633",
        "https://git.kernel.org/stable/c/b0abcd65ec545701b8793e12bc27dc98042b151a",
        "https://git.kernel.org/stable/c/bce966530fd5542bbb422cb45ecb775f7a1a6bc3",
        "https://git.kernel.org/stable/c/ef51c0d544b1518b35364480317ab6d3468f205d",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html",
        "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50047.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-50047",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50047.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-50047",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493638,
  "published_at": "2024-10-21T19:39:44.43+00:00"
}