{
  "cveId": "CVE-2025-38523",
  "url": "https://patchblox.com/security/cve/CVE-2025-38523",
  "summary": "CVE-2025-38523 is fixed in 87 products on 1 platform, first by ALAS2023-2025-1130, released July 29, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "kernel: In the Linux kernel, the following vulnerability has been resolved:\ncifs: Fix the smbd_response slab to allow usercop...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:\ncifs: Fix the smbd_response slab to allow usercopy\nThe handling of received data in the smbdirect client code involves using\ncopy_to_iter() to copy data from the smbd_reponse struct\u0027s packet trailer\nto a folioq buffer provided by netfslib that encapsulates a chunk of\npagecache.\nIf, however, CONFIG_HARDENED_USERCOPY=y, this will result in the checks\nthen performed in copy_to_iter() oopsing with something like the following:\nCIFS: Attempting to mount //172.31.9.1/test\nCIFS: VFS: RDMA transport established\nusercopy: Kernel memory exposure attempt detected from SLUB object \u0027smbd_response_0000000091e24ea1\u0027 (offset 81, size 63)!\n------------[ cut here ]------------\nkernel BUG at mm/usercopy.c:102!\n...\nRIP: 0010:usercopy_abort\u002B0x6c/0x80\n...\nCall Trace:\n\u003CTASK\u003E\n__check_heap_object\u002B0xe3/0x120\n__check_object_size\u002B0x4dc/0x6d0\nsmbd_recv\u002B0x77f/0xfe0 [cifs]\ncifs_readv_from_socket\u002B0x276/0x8f0 [cifs]\ncifs_read_from_socket\u002B0xcd/0x120 [cifs]\ncifs_demultiplex_thread\u002B0x7e9/0x2d50 [cifs]\nkthread\u002B0x396/0x830\nret_from_fork\u002B0x2b8/0x3b0\nret_from_fork_asm\u002B0x1a/0x30\nThe problem is that the smbd_response slab\u0027s packet field isn\u0027t marked as\nbeing permitted for usercopy.\nFix this by passing parameters to kmem_slab_create() to indicate that\ncopy_to_iter() is permitted from the packet region of the smbd_response\nslab objects, less the header space.",
  "published": "2025-07-29T23:15:00Z",
  "severity": "moderate",
  "cvss": 7.3,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
  "epss": 0.00389,
  "epssPercentile": 0.33291,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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}