{
  "cveId": "CVE-2024-47716",
  "url": "https://patchblox.com/security/cve/CVE-2024-47716",
  "summary": "CVE-2024-47716 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-47716, released October 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ARM: 9410/1: vfp: Use asm volatile in fmrx/fmxr...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ARM: 9410/1: vfp: Use asm volatile in fmrx/fmxr macros  Floating point instructions in userspace can crash some arm kernels built with clang/LLD 17.0.6:      BUG: unsupported FP instruction in kernel mode     FPEXC == 0xc0000780     Internal error: Oops - undefined instruction: 0 [#1] ARM     CPU: 0 PID: 196 Comm: vfp-reproducer Not tainted 6.10.0 #1     Hardware name: BCM2835     PC is at vfp_support_entry\u002B0xc8/0x2cc     LR is at do_undefinstr\u002B0xa8/0x250     pc : [\u003Cc0101d50\u003E]    lr : [\u003Cc010a80c\u003E]    psr: a0000013     sp : dc8d1f68  ip : 60000013  fp : bedea19c     r10: ec532b17  r9 : 00000010  r8 : 0044766c     r7 : c0000780  r6 : ec532b17  r5 : c1c13800  r4 : dc8d1fb0     r3 : c10072c4  r2 : c0101c88  r1 : ec532b17  r0 : 0044766c     Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none     Control: 00c5387d  Table: 0251c008  DAC: 00000051     Register r0 information: non-paged memory     Register r1 information: vmalloc memory     Register r2 information: non-slab/vmalloc memory     Register r3 information: non-slab/vmalloc memory     Register r4 information: 2-page vmalloc region     Register r5 information: slab kmalloc-cg-2k     Register r6 information: vmalloc memory     Register r7 information: non-slab/vmalloc memory     Register r8 information: non-paged memory     Register r9 information: zero-size pointer     Register r10 information: vmalloc memory     Register r11 information: non-paged memory     Register r12 information: non-paged memory     Process vfp-reproducer (pid: 196, stack limit = 0x61aaaf8b)     Stack: (0xdc8d1f68 to 0xdc8d2000)     1f60:                   0000081f b6f69300 0000000f c10073f4 c10072c4 dc8d1fb0     1f80: ec532b17 0c532b17 0044766c b6f9ccd8 00000000 c010a80c 00447670 60000010     1fa0: ffffffff c1c13800 00c5387d c0100f10 b6f68af8 00448fc0 00000000 bedea188     1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c     1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff 00000000 00000000     Call trace:     [\u003Cc0101d50\u003E] (vfp_support_entry) from [\u003Cc010a80c\u003E] (do_undefinstr\u002B0xa8/0x250)     [\u003Cc010a80c\u003E] (do_undefinstr) from [\u003Cc0100f10\u003E] (__und_usr\u002B0x70/0x80)     Exception stack(0xdc8d1fb0 to 0xdc8d1ff8)     1fa0:                                     b6f68af8 00448fc0 00000000 bedea188     1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c     1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff     Code: 0a000061 e3877202 e594003c e3a09010 (eef16a10)     ---[ end trace 0000000000000000 ]---     Kernel panic - not syncing: Fatal exception in interrupt     ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---  This is a minimal userspace reproducer on a Raspberry Pi Zero W:      #include \u003Cstdio.h\u003E     #include \u003Cmath.h\u003E      int main(void)     {             double v = 1.0;             printf(\u0022%fn\u0022, NAN \u002B *(volatile double *)\u0026v);             return 0;     }  Another way to consistently trigger the oops is:      calvin@raspberry-pi-zero-w ~$ python -c \u0022import json\u0022  The bug reproduces only when the kernel is built with DYNAMIC_DEBUG=n, because the pr_debug() calls act as barriers even when not activated.  This is the output from the same kernel source built with the same compiler and DYNAMIC_DEBUG=y, where the userspace reproducer works as expected:      VFP: bounce: trigger ec532b17 fpexc c0000780     VFP: emulate: INST=0xee377b06 SCR=0x00000000     VFP: bounce: trigger eef1fa10 fpexc c0000780     VFP: emulate: INST=0xeeb40b40 SCR=0x00000000     VFP: raising exceptions 30000000      calvin@raspberry-pi-zero-w ~$ ./vfp-reproducer     nan  Crudely grepping for vmsr/vmrs instructions in the otherwise nearly idential text for vfp_support_entry() makes the problem obvious:      vmlinux.llvm.good [0xc0101cb8] \u003C\u002B48\u003E:  vmrs   r7, fpexc     vmlinux.llvm.good [0xc0101cd8] \u003C\u002B80\u003E:  vmsr   fpexc, r0     vmlinux.llvm.good [0xc0101d20 ---truncated---",
  "published": "2024-10-21T12:15:07Z",
  "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": 0.00219,
  "epssPercentile": 0.12428,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.11.2-1",
      "fix": "DEBIAN-CVE-2024-47716",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-47716",
      "released": "2024-10-21T12:15:07Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.11.2-1",
      "fix": "DEBIAN-CVE-2024-47716",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-47716",
      "released": "2024-10-21T12:15:07Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}