{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2025-40052",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-40052",
    "idYear": 2025,
    "status": "PUBLISHED",
    "publishedAt": "2025-10-28T11:48:27.854Z",
    "updatedAt": "2026-05-11T21:41:32.977Z",
    "importedAt": "2026-10-24T01:57:34.152Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "smb: client: fix crypto buffers in non-linear memory",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix crypto buffers in non-linear memory\n\nThe crypto API, through the scatterlist API, expects input buffers to be\nin linear memory.  We handle this with the cifs_sg_set_buf() helper\nthat converts vmalloc'd memory to their corresponding pages.\n\nHowever, when we allocate our aead_request buffer (@creq in\nsmb2ops.c::crypt_message()), we do so with kvzalloc(), which possibly\nputs aead_request->__ctx in vmalloc area.\n\nAEAD algorithm then uses ->__ctx for its private/internal data and\noperations, and uses sg_set_buf() for such data on a few places.\n\nThis works fine as long as @creq falls into kmalloc zone (small\nrequests) or vmalloc'd memory is still within linear range.\n\nTasks' stacks are vmalloc'd by default (CONFIG_VMAP_STACK=y), so too\nmany tasks will increment the base stacks' addresses to a point where\nvirt_addr_valid(buf) will fail (BUG() in sg_set_buf()) when that\nhappens.\n\nIn practice: too many parallel reads and writes on an encrypted mount\nwill trigger this bug.\n\nTo fix this, always alloc @creq with kmalloc() instead.\nAlso drop the @sensitive_size variable/arguments since\nkfree_sensitive() doesn't need it.\n\nBacktrace:\n\n[  945.272081] ------------[ cut here ]------------\n[  945.272774] kernel BUG at include/linux/scatterlist.h:209!\n[  945.273520] Oops: invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC NOPTI\n[  945.274412] CPU: 7 UID: 0 PID: 56 Comm: kworker/u33:0 Kdump: loaded Not tainted 6.15.0-lku-11779-g8e9d6efccdd7-dirty #1 PREEMPT(voluntary)\n[  945.275736] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-2-gc13ff2cd-prebuilt.qemu.org 04/01/2014\n[  945.276877] Workqueue: writeback wb_workfn (flush-cifs-2)\n[  945.277457] RIP: 0010:crypto_gcm_init_common+0x1f9/0x220\n[  945.278018] Code: b0 00 00 00 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 48 c7 c0 00 00 00 80 48 2b 05 5c 58 e5 00 e9 58 ff ff ff <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b 0f 0b 48 c7 04 24 01 00 00 00 48 8b\n[  945.279992] RSP: 0018:ffffc90000a27360 EFLAGS: 00010246\n[  945.280578] RAX: 0000000000000000 RBX: ffffc90001d85060 RCX: 0000000000000030\n[  945.281376] RDX: 0000000000080000 RSI: 0000000000000000 RDI: ffffc90081d85070\n[  945.282145] RBP: ffffc90001d85010 R08: ffffc90001d85000 R09: 0000000000000000\n[  945.282898] R10: ffffc90001d85090 R11: 0000000000001000 R12: ffffc90001d85070\n[  945.283656] R13: ffff888113522948 R14: ffffc90001d85060 R15: ffffc90001d85010\n[  945.284407] FS:  0000000000000000(0000) GS:ffff8882e66cf000(0000) knlGS:0000000000000000\n[  945.285262] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  945.285884] CR2: 00007fa7ffdd31f4 CR3: 000000010540d000 CR4: 0000000000350ef0\n[  945.286683] Call Trace:\n[  945.286952]  <TASK>\n[  945.287184]  ? crypt_message+0x33f/0xad0 [cifs]\n[  945.287719]  crypto_gcm_encrypt+0x36/0xe0\n[  945.288152]  crypt_message+0x54a/0xad0 [cifs]\n[  945.288724]  smb3_init_transform_rq+0x277/0x300 [cifs]\n[  945.289300]  smb_send_rqst+0xa3/0x160 [cifs]\n[  945.289944]  cifs_call_async+0x178/0x340 [cifs]\n[  945.290514]  ? __pfx_smb2_writev_callback+0x10/0x10 [cifs]\n[  945.291177]  smb2_async_writev+0x3e3/0x670 [cifs]\n[  945.291759]  ? find_held_lock+0x32/0x90\n[  945.292212]  ? netfs_advance_write+0xf2/0x310\n[  945.292723]  netfs_advance_write+0xf2/0x310\n[  945.293210]  netfs_write_folio+0x346/0xcc0\n[  945.293689]  ? __pfx__raw_spin_unlock_irq+0x10/0x10\n[  945.294250]  netfs_writepages+0x117/0x460\n[  945.294724]  do_writepages+0xbe/0x170\n[  945.295152]  ? find_held_lock+0x32/0x90\n[  945.295600]  ? kvm_sched_clock_read+0x11/0x20\n[  945.296103]  __writeback_single_inode+0x56/0x4b0\n[  945.296643]  writeback_sb_inodes+0x229/0x550\n[  945.297140]  __writeback_inodes_wb+0x4c/0xe0\n[  945.297642]  wb_writeback+0x2f1/0x3f0\n[  945.298069]  wb_workfn+0x300/0x490\n[  945.298472]  process_one_work+0x1fe/0x590\n[  945.298949]  worker_thread+0x1ce/0x3c0\n[  945.299397]  ? __pfx_worker_thread+0x10/0x10\n[  945.299900]  kthr\n---truncated---",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ba905a567105dde21cdb8e6d3a87110fa434b393"
            },
            {
              "version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7a8a8c15468f0c99685e9964451feffd1a3cc859"
            },
            {
              "version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4a61b68abd2788db0364c9a0b6a39f1699fea440"
            },
            {
              "version": "d08089f649a0cfb2099c8551ac47eef0cc23fdf2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "998a67b954680f26f3734040aeeed08642d49721"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.3",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.3"
            },
            {
              "version": "6.6.112",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.53",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.17.3",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.17.*"
            },
            {
              "version": "6.18",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}