smb: client: fix NULL ptr deref in crypto_aead_setkey()

{
  "id": "422969ab1151250849bc39ae3979f8fe51feaa8576662fbc8dfe5ccce473eec9",
  "url": "https://osv.dev/vulnerability/CVE-2024-53185",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "smb: client: fix NULL ptr deref in crypto_aead_setkey()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: smb: client: fix NULL ptr deref in crypto_aead_setkey() Neither SMB3.0 or SMB3.02 supports encryption negotiate context, so when SMB2_GLOBAL_CAP_ENCRYPTION flag is set in the negotiate response, the client uses AES-128-CCM as the default cipher. See MS-SMB2 3.3.5.4. Commit b0abcd65ec54 (\"smb: client: fix UAF in async decryption\") added a @server->cipher_type check to conditionally call smb3_crypto_aead_allocate(), but that check would always be false as @server->cipher_type is unset for SMB3.02. Fix the following KASAN splat by setting @server->cipher_type for SMB3.02 as well. mount.cifs //srv/share /mnt -o vers=3.02,seal,... BUG: KASAN: null-ptr-deref in crypto_aead_setkey+0x2c/0x130 Read of size 8 at addr 0000000000000020 by task mount.cifs/1095 CPU: 1 UID: 0 PID: 1095 Comm: mount.cifs Not tainted 6.12.0 #1 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-3.fc41 04/01/2014 Call Trace: dump_stack_lvl+0x5d/0x80 ? crypto_aead_setkey+0x2c/0x130 kasan_report+0xda/0x110 ? crypto_aead_setkey+0x2c/0x130 crypto_aead_setkey+0x2c/0x130 crypt_message+0x258/0xec0 [cifs] ? __asan_memset+0x23/0x50 ? __pfx_crypt_message+0x10/0x10 [cifs] ? mark_lock+0xb0/0x6a0 ? hlock_class+0x32/0xb0 ? mark_lock+0xb0/0x6a0 smb3_init_transform_rq+0x352/0x3f0 [cifs] ? lock_acquire.part.0+0xf4/0x2a0 smb_send_rqst+0x144/0x230 [cifs] ? __pfx_smb_send_rqst+0x10/0x10 [cifs] ? hlock_class+0x32/0xb0 ? smb2_setup_request+0x225/0x3a0 [c",
    "evidence": "osv:CVE-2024-53185",
    "products": [
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        "prerequisites": [],
        "fixed_versions": [
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    "severity": "high",
    "structured": {
      "id": "CVE-2024-53185",
      "aliases": [
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      "metrics": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
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      "modified": "2026-10-28T02:30:35.969327715Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/22127c1dc04364cda3da812161e70921e6c3c0af",
        "https://git.kernel.org/stable/c/44c495818d9c4a741ab9e6bc9203ccc9f55f6f40",
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        "https://git.kernel.org/stable/c/4a788ebbb10db9da453d52eaf44a41c13dc446df",
        "https://git.kernel.org/stable/c/4bdec0d1f658f7c98749bd2c5a486e6cfa8565d2",
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        "https://git.kernel.org/stable/c/9b8904b53b5ace0519c74cd89fc3ca763f3856d4",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/53xxx/CVE-2024-53185.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-53185",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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  "source_id": "core-osv",
  "document_id": 503117,
  "published_at": "2024-12-27T13:49:28.304+00:00"
}