{
  "cveId": "CVE-2026-23327",
  "url": "https://patchblox.com/security/cve/CVE-2026-23327",
  "summary": "CVE-2026-23327 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-23327, released March 25, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "cxl/mbox: validate payload size before accessing contents in cxl_payload_from_user_allowed()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  cxl/mbox: validate payload size before accessing contents in cxl_payload_from_user_allowed()  cxl_payload_from_user_allowed() casts and dereferences the input payload without first verifying its size. When a raw mailbox command is sent with an undersized payload (ie: 1 byte for CXL_MBOX_OP_CLEAR_LOG, which expects a 16-byte UUID), uuid_equal() reads past the allocated buffer, triggering a KASAN splat:  BUG: KASAN: slab-out-of-bounds in memcmp\u002B0x176/0x1d0 lib/string.c:683 Read of size 8 at addr ffff88810130f5c0 by task syz.1.62/2258  CPU: 2 UID: 0 PID: 2258 Comm: syz.1.62 Not tainted 6.19.0-dirty #3 PREEMPT(voluntary) Hardware name: QEMU Standard PC (Q35 \u002B ICH9, 2009), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014 Call Trace:  \u003CTASK\u003E  __dump_stack lib/dump_stack.c:94 [inline]  dump_stack_lvl\u002B0xab/0xe0 lib/dump_stack.c:120  print_address_description mm/kasan/report.c:378 [inline]  print_report\u002B0xce/0x650 mm/kasan/report.c:482  kasan_report\u002B0xce/0x100 mm/kasan/report.c:595  memcmp\u002B0x176/0x1d0 lib/string.c:683  uuid_equal include/linux/uuid.h:73 [inline]  cxl_payload_from_user_allowed drivers/cxl/core/mbox.c:345 [inline]  cxl_mbox_cmd_ctor drivers/cxl/core/mbox.c:368 [inline]  cxl_validate_cmd_from_user drivers/cxl/core/mbox.c:522 [inline]  cxl_send_cmd\u002B0x9c0/0xb50 drivers/cxl/core/mbox.c:643  __cxl_memdev_ioctl drivers/cxl/core/memdev.c:698 [inline]  cxl_memdev_ioctl\u002B0x14f/0x190 drivers/cxl/core/memdev.c:713  vfs_ioctl fs/ioctl.c:51 [inline]  __do_sys_ioctl fs/ioctl.c:597 [inline]  __se_sys_ioctl fs/ioctl.c:583 [inline]  __x64_sys_ioctl\u002B0x18e/0x210 fs/ioctl.c:583  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]  do_syscall_64\u002B0xa8/0x330 arch/x86/entry/syscall_64.c:94  entry_SYSCALL_64_after_hwframe\u002B0x77/0x7f RIP: 0033:0x7fdaf331ba79 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003C48\u003E 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fdaf1d77038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fdaf3585fa0 RCX: 00007fdaf331ba79 RDX: 00002000000001c0 RSI: 00000000c030ce02 RDI: 0000000000000003 RBP: 00007fdaf33749df R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fdaf3586038 R14: 00007fdaf3585fa0 R15: 00007ffced2af768  \u003C/TASK\u003E  Add \u0027in_size\u0027 parameter to cxl_payload_from_user_allowed() and validate the payload is large enough.",
  "published": "2026-03-25T11:16:29Z",
  "severity": "Important",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
  "epss": 0.00166,
  "epssPercentile": 0.05844,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23327",
  "fixes": [
    {
      "platform": "linux",
      "product": "dtb-aarch64",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.35.1",
      "fix": "OPENSUSE-SU-2026:20965-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-20965-1",
      "released": "2026-06-15T13:44:30Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.35.1",
      "fix": "OPENSUSE-SU-2026:20965-1",
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      "released": "2026-06-15T13:44:30Z"
    },
    {
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      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.60.1",
      "fix": "SUSE-SU-2026:2482-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2482-1",
      "released": "2026-06-22T11:10:39Z"
    },
    {
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      "fix": "SUSE-SU-2026:22127-1",
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      "released": "2026-06-15T13:06:19Z"
    },
    {
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  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}