{
  "cveId": "CVE-2025-21632",
  "url": "https://patchblox.com/security/cve/CVE-2025-21632",
  "summary": "CVE-2025-21632 is fixed in 61 products on 1 platform, first by DEBIAN-CVE-2025-21632, released January 19, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  x86/fpu: Ensure shadow stack is active before \u0022g...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  x86/fpu: Ensure shadow stack is active before \u0022getting\u0022 registers  The x86 shadow stack support has its own set of registers. Those registers are XSAVE-managed, but they are \u0022supervisor state components\u0022 which means that userspace can not touch them with XSAVE/XRSTOR.  It also means that they are not accessible from the existing ptrace ABI for XSAVE state. Thus, there is a new ptrace get/set interface for it.  The regset code that ptrace uses provides an -\u003Eactive() handler in addition to the get/set ones. For shadow stack this -\u003Eactive() handler verifies that shadow stack is enabled via the ARCH_SHSTK_SHSTK bit in the thread struct. The -\u003Eactive() handler is checked from some call sites of the regset get/set handlers, but not the ptrace ones. This was not understood when shadow stack support was put in place.  As a result, both the set/get handlers can be called with XFEATURE_CET_USER in its init state, which would cause get_xsave_addr() to return NULL and trigger a WARN_ON(). The ssp_set() handler luckily has an ssp_active() check to avoid surprising the kernel with shadow stack behavior when the kernel is not ready for it (ARCH_SHSTK_SHSTK==0). That check just happened to avoid the warning.  But the -\u003Eget() side wasn\u0027t so lucky. It can be called with shadow stacks disabled, triggering the warning in practice, as reported by Christina Schimpe:  WARNING: CPU: 5 PID: 1773 at arch/x86/kernel/fpu/regset.c:198 ssp_get\u002B0x89/0xa0 [...] Call Trace: \u003CTASK\u003E ? show_regs\u002B0x6e/0x80 ? ssp_get\u002B0x89/0xa0 ? __warn\u002B0x91/0x150 ? ssp_get\u002B0x89/0xa0 ? report_bug\u002B0x19d/0x1b0 ? handle_bug\u002B0x46/0x80 ? exc_invalid_op\u002B0x1d/0x80 ? asm_exc_invalid_op\u002B0x1f/0x30 ? __pfx_ssp_get\u002B0x10/0x10 ? ssp_get\u002B0x89/0xa0 ? ssp_get\u002B0x52/0xa0 __regset_get\u002B0xad/0xf0 copy_regset_to_user\u002B0x52/0xc0 ptrace_regset\u002B0x119/0x140 ptrace_request\u002B0x13c/0x850 ? wait_task_inactive\u002B0x142/0x1d0 ? do_syscall_64\u002B0x6d/0x90 arch_ptrace\u002B0x102/0x300 [...]  Ensure that shadow stacks are active in a thread before looking them up in the XSAVE buffer. Since ARCH_SHSTK_SHSTK and user_ssp[SHSTK_EN] are set at the same time, the active check ensures that there will be something to find in the XSAVE buffer.  [ dhansen: changelog/subject tweaks ]",
  "published": "2025-01-19T11:15:08Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00206,
  "epssPercentile": 0.10712,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-21632",
      "released": "2025-01-19T11:15:08Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}