{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-47716", "modified": "2026-10-07T17:22:01Z", "upstream": [ "CVE-2024-47716" ], "published": "2024-10-21T12:02:02Z", "summary": "ARM: 9410/1: vfp: Use asm volatile in fmrx/fmxr macros", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nARM: 9410/1: vfp: Use asm volatile in fmrx/fmxr macros\n\nFloating point instructions in userspace can crash some arm kernels\nbuilt with clang/LLD 17.0.6:\n\n BUG: unsupported FP instruction in kernel mode\n FPEXC == 0xc0000780\n Internal error: Oops - undefined instruction: 0 [#1] ARM\n CPU: 0 PID: 196 Comm: vfp-reproducer Not tainted 6.10.0 #1\n Hardware name: BCM2835\n PC is at vfp_support_entry+0xc8/0x2cc\n LR is at do_undefinstr+0xa8/0x250\n pc : [] lr : [] psr: a0000013\n sp : dc8d1f68 ip : 60000013 fp : bedea19c\n r10: ec532b17 r9 : 00000010 r8 : 0044766c\n r7 : c0000780 r6 : ec532b17 r5 : c1c13800 r4 : dc8d1fb0\n r3 : c10072c4 r2 : c0101c88 r1 : ec532b17 r0 : 0044766c\n Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none\n Control: 00c5387d Table: 0251c008 DAC: 00000051\n Register r0 information: non-paged memory\n Register r1 information: vmalloc memory\n Register r2 information: non-slab/vmalloc memory\n Register r3 information: non-slab/vmalloc memory\n Register r4 information: 2-page vmalloc region\n Register r5 information: slab kmalloc-cg-2k\n Register r6 information: vmalloc memory\n Register r7 information: non-slab/vmalloc memory\n Register r8 information: non-paged memory\n Register r9 information: zero-size pointer\n Register r10 information: vmalloc memory\n Register r11 information: non-paged memory\n Register r12 information: non-paged memory\n Process vfp-reproducer (pid: 196, stack limit = 0x61aaaf8b)\n Stack: (0xdc8d1f68 to 0xdc8d2000)\n 1f60: 0000081f b6f69300 0000000f c10073f4 c10072c4 dc8d1fb0\n 1f80: ec532b17 0c532b17 0044766c b6f9ccd8 00000000 c010a80c 00447670 60000010\n 1fa0: ffffffff c1c13800 00c5387d c0100f10 b6f68af8 00448fc0 00000000 bedea188\n 1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c\n 1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff 00000000 00000000\n Call trace:\n [] (vfp_support_entry) from [] (do_undefinstr+0xa8/0x250)\n [] (do_undefinstr) from [] (__und_usr+0x70/0x80)\n Exception stack(0xdc8d1fb0 to 0xdc8d1ff8)\n 1fa0: b6f68af8 00448fc0 00000000 bedea188\n 1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c\n 1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff\n Code: 0a000061 e3877202 e594003c e3a09010 (eef16a10)\n ---[ end trace 0000000000000000 ]---\n Kernel panic - not syncing: Fatal exception in interrupt\n ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---\n\nThis is a minimal userspace reproducer on a Raspberry Pi Zero W:\n\n #include \n #include \n\n int main(void)\n {\n double v = 1.0;\n printf(\"%fn\", NAN + *(volatile double *)&v);\n return 0;\n }\n\nAnother way to consistently trigger the oops is:\n\n calvin@raspberry-pi-zero-w ~$ python -c \"import json\"\n\nThe bug reproduces only when the kernel is built with DYNAMIC_DEBUG=n,\nbecause the pr_debug() calls act as barriers even when not activated.\n\nThis is the output from the same kernel source built with the same\ncompiler and DYNAMIC_DEBUG=y, where the userspace reproducer works as\nexpected:\n\n VFP: bounce: trigger ec532b17 fpexc c0000780\n VFP: emulate: INST=0xee377b06 SCR=0x00000000\n VFP: bounce: trigger eef1fa10 fpexc c0000780\n VFP: emulate: INST=0xeeb40b40 SCR=0x00000000\n VFP: raising exceptions 30000000\n\n calvin@raspberry-pi-zero-w ~$ ./vfp-reproducer\n nan\n\nCrudely grepping for vmsr/vmrs instructions in the otherwise nearly\nidential text for vfp_support_entry() makes the problem obvious:\n\n vmlinux.llvm.good [0xc0101cb8] <+48>: vmrs r7, fpexc\n vmlinux.llvm.good [0xc0101cd8] <+80>: vmsr fpexc, r0\n vmlinux.llvm.good [0xc0101d20\n---truncated---", "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1", "1:6.6.47-1+rpt1", "1:6.6.51-1+rpt1", "1:6.6.51-1+rpt2", "1:6.6.51-1+rpt3" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.6.20+rpt-rpi-v6", "binary_version": "1:6.6.20-1+rpt1" }, { "binary_name": "linux-image-6.6.20+rpt-rpi-v7", "binary_version": "1:6.6.20-1+rpt1" }, { "binary_name": "linux-image-6.6.20+rpt-rpi-v7l", "binary_version": "1:6.6.20-1+rpt1" }, { "binary_name": "linux-image-6.6.28+rpt-rpi-v6", "binary_version": "1:6.6.28-1+rpt1" }, { "binary_name": "linux-image-6.6.28+rpt-rpi-v7", "binary_version": "1:6.6.28-1+rpt1" }, { "binary_name": "linux-image-6.6.28+rpt-rpi-v7l", "binary_version": "1:6.6.28-1+rpt1" }, { "binary_name": "linux-image-6.6.31+rpt-rpi-v6", "binary_version": "1:6.6.31-1+rpt1" }, { "binary_name": "linux-image-6.6.31+rpt-rpi-v7", "binary_version": "1:6.6.31-1+rpt1" }, { "binary_name": 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"linux-image-6.6.51+rpt-rpi-v7", "binary_version": "1:6.6.51-1+rpt3" }, { "binary_name": "linux-image-6.6.51+rpt-rpi-v7l", "binary_version": "1:6.6.51-1+rpt3" } ] }, "database_specific": { "per_version": { "1:6.6.20-1+rpt1": { "linux_commit": "6f16847710cc0502450788b9f12f0a14d3429668", "upstream_version": "6.6.20", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.54" }, "1:6.6.28-1+rpt1": { "linux_commit": "0c341f47adc3578cd5f817aa20ee2b7f9ae6b23e", "upstream_version": "6.6.28", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.54" }, "1:6.6.31-1+rpt1": { "linux_commit": "c1432b4bae5b6582f4d32ba381459f33c34d1424", "upstream_version": "6.6.31", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.54" }, "1:6.6.47-1+rpt1": { "linux_commit": "cf64a1dfecc2dc418efdd61701c1a4b185ab4761", "upstream_version": "6.6.47", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.54" }, "1:6.6.51-1+rpt1": { "linux_commit": 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"https://git.kernel.org/stable/c/89a906dfa8c3b21b3e5360f73c49234ac1eb885b" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-05-12T04:54:46Z" } }