{"cve":"CVE-2025-37991","nvd":{"published":"2025-05-20T18:15:45.997","modified":"2026-06-17T09:15:50.220","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nparisc: Fix double SIGFPE crash\n\nCamm noticed that on parisc a SIGFPE exception will crash an application with\na second SIGFPE in the signal handler.  Dave analyzed it, and it happens\nbecause glibc uses a double-word floating-point store to atomically update\nfunction descriptors. As a result of lazy binding, we hit a floating-point\nstore in fpe_func almost immediately.\n\nWhen the T bit is set, an assist exception trap occurs when when the\nco-processor encounters *any* floating-point instruction except for a double\nstore of register %fr0.  The latter cancels all pending traps.  Let's fix this\nby clearing the Trap (T) bit in the FP status register before returning to the\nsignal handler in userspace.\n\nThe issue can be reproduced with this test program:\n\nroot@parisc:~# cat fpe.c\n\nstatic void fpe_func(int sig, siginfo_t *i, void *v) {\n        sigset_t set;\n        sigemptyset(&set);\n        sigaddset(&set, SIGFPE);\n        sigprocmask(SIG_UNBLOCK, &set, NULL);\n        printf(\"GOT signal %d with si_code %ld\\n\", sig, i->si_code);\n}\n\nint main() {\n        struct sigaction action = {\n                .sa_sigaction = fpe_func,\n                .sa_flags = SA_RESTART|SA_SIGINFO };\n        sigaction(SIGFPE, &action, 0);\n        feenableexcept(FE_OVERFLOW);\n        return printf(\"%lf\\n\",1.7976931348623158E308*1.7976931348623158E308);\n}\n\nroot@parisc:~# gcc fpe.c -lm\nroot@parisc:~# ./a.out\n Floating point exception\n\nroot@parisc:~# strace -f ./a.out\n execve(\"./a.out\", [\"./a.out\"], 0xf9ac7034 /* 20 vars */) = 0\n getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM_INFINITY}) = 0\n ...\n rt_sigaction(SIGFPE, {sa_handler=0x1110a, sa_mask=[], sa_flags=SA_RESTART|SA_SIGINFO}, NULL, 8) = 0\n --- SIGFPE {si_signo=SIGFPE, si_code=FPE_FLTOVF, si_addr=0x1078f} ---\n --- SIGFPE {si_signo=SIGFPE, si_code=FPE_FLTOVF, si_addr=0xf8f21237} ---\n +++ killed by SIGFPE +++\n Floating point exception","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-415"],"references":["https://git.kernel.org/stable/c/2a1aff3616b3b57aa4a5f8a7762cce1e82493fe6","https://git.kernel.org/stable/c/6a098c51d18ec99485668da44294565c43dbc106","https://git.kernel.org/stable/c/6c639af49e9e5615a8395981eaf5943fb40acd6f","https://git.kernel.org/stable/c/757ba4d17b868482837c566cfefca59e2296c608","https://git.kernel.org/stable/c/cf21e890f56b7d0038ddaf25224e4f4c69ecd143"],"products":["debian:debian_linux","linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:01:57.636215869+00:00"},"epss":{"cve":"CVE-2025-37991","score":0.00227,"percentile":0.13475,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}