cbcvebase.
CVE-2025-37991
published 2025-05-20

CVE-2025-37991: In the Linux kernel, the following vulnerability has been resolved: parisc: Fix double SIGFPE crash Camm noticed that on parisc a SIGFPE exception will crash…

high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
In the Linux kernel, the following vulnerability has been resolved: parisc: Fix double SIGFPE crash Camm noticed that on parisc a SIGFPE exception will crash an application with a second SIGFPE in the signal handler. Dave analyzed it, and it happens because glibc uses a double-word floating-point store to atomically update function descriptors. As a result of lazy binding, we hit a floating-point store in fpe_func almost immediately. When the T bit is set, an assist exception trap occurs when when the co-processor encounters *any* floating-point instruction except for a double store of register %fr0. The latter cancels all pending traps. Let's fix this by clearing the Trap (T) bit in the FP status register before returning to the signal handler in userspace. The issue can be reproduced with this test program: root@parisc:~# cat fpe.c static void fpe_func(int sig, siginfo_t *i, void *v) { sigset_t set; sigemptyset(&set); sigaddset(&set, SIGFPE); sigprocmask(SIG_UNBLOCK, &set, NULL); printf("GOT signal %d with si_code %ld\n", sig, i->si_code); } int main() { struct sigaction action = { .sa_sigaction = fpe_func, .sa_flags = SA_RESTART|SA_SIGINFO }; sigaction(SIGFPE, &action, 0); feenableexcept(FE_OVERFLOW); return printf("%lf\n",1.7976931348623158E308*1.7976931348623158E308); } root@parisc:~# gcc fpe.c -lm root@parisc:~# ./a.out Floating point exception root@parisc:~# strace -f ./a.out execve("./a.out", ["./a.out"], 0xf9ac7034 /* 20 vars */) = 0 getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM_INFINITY}) = 0 ... rt_sigaction(SIGFPE, {sa_handler=0x1110a, sa_mask=[], sa_flags=SA_RESTART|SA_SIGINFO}, NULL, 8) = 0 --- SIGFPE {si_signo=SIGFPE, si_code=FPE_FLTOVF, si_addr=0x1078f} --- --- SIGFPE {si_signo=SIGFPE, si_code=FPE_FLTOVF, si_addr=0xf8f21237} --- +++ killed by SIGFPE +++ Floating point exception

Affected

35 ranges· showing 25
VendorProductVersion rangeFixed in
debiandebian_linux
debianlinux< linux 6.1.140-1 (bookworm)linux 6.1.140-1 (bookworm)
debianlinux-6.1< linux 6.1.140-1 (bookworm)linux 6.1.140-1 (bookworm)
linuxlinux
linuxlinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2a1aff3616b3b57aa4a5f8a7762cce1e82493fe62a1aff3616b3b57aa4a5f8a7762cce1e82493fe6
linuxlinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 757ba4d17b868482837c566cfefca59e2296c608757ba4d17b868482837c566cfefca59e2296c608
linuxlinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < ec4584495868bd465fe60a3f771915c0e7ce7951ec4584495868bd465fe60a3f771915c0e7ce7951
linuxlinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6c639af49e9e5615a8395981eaf5943fb40acd6f6c639af49e9e5615a8395981eaf5943fb40acd6f
linuxlinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6a098c51d18ec99485668da44294565c43dbc1066a098c51d18ec99485668da44294565c43dbc106
linuxlinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < cf21e890f56b7d0038ddaf25224e4f4c69ecd143cf21e890f56b7d0038ddaf25224e4f4c69ecd143
linuxlinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < df3592e493d7f29bae4ffde9a9325de50ddf962edf3592e493d7f29bae4ffde9a9325de50ddf962e
linuxlinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < de3629baf5a33af1919dec7136d643b0662e85efde3629baf5a33af1919dec7136d643b0662e85ef
linuxlinux_kernel< 5.4.2945.4.294
linuxlinux_kernel
linuxlinux_kernel>= 0 < 6.1.140-16.1.140-1
linuxlinux_kernel>= 0 < 6.12.29-16.12.29-1
linuxlinux_kernel>= 0 < 6.12.29-16.12.29-1
linuxlinux_kernel>= 0 < 5.15.0-144.1575.15.0-144.157
linuxlinux_kernel>= 0 < 6.8.0-100.1006.8.0-100.100
linuxlinux_kernel>= 0 < 6.14.0-24.246.14.0-24.24
linuxlinux_kernel>= 5.11 < 5.15.1825.15.182
linuxlinux_kernel>= 5.16 < 6.1.1386.1.138
linuxlinux_kernel>= 5.5 < 5.10.2385.10.238
linuxlinux_kernel>= 6.13 < 6.14.66.14.6
linuxlinux_kernel>= 6.2 < 6.6.906.6.90

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
osv8.8HIGH