{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-37991", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.976Z", "datePublished": "2025-05-20T17:18:45.988Z", "dateUpdated": "2025-11-03T19:58:05.217Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-06-04T12:57:40.511Z"}, "descriptions": [{"lang": "en", "value": "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"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/parisc/math-emu/driver.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "2a1aff3616b3b57aa4a5f8a7762cce1e82493fe6", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "757ba4d17b868482837c566cfefca59e2296c608", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "ec4584495868bd465fe60a3f771915c0e7ce7951", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "6c639af49e9e5615a8395981eaf5943fb40acd6f", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "6a098c51d18ec99485668da44294565c43dbc106", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "cf21e890f56b7d0038ddaf25224e4f4c69ecd143", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "df3592e493d7f29bae4ffde9a9325de50ddf962e", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "de3629baf5a33af1919dec7136d643b0662e85ef", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/parisc/math-emu/driver.c"], "versions": [{"version": 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"https://git.kernel.org/stable/c/757ba4d17b868482837c566cfefca59e2296c608"}, {"url": "https://git.kernel.org/stable/c/ec4584495868bd465fe60a3f771915c0e7ce7951"}, {"url": "https://git.kernel.org/stable/c/6c639af49e9e5615a8395981eaf5943fb40acd6f"}, {"url": "https://git.kernel.org/stable/c/6a098c51d18ec99485668da44294565c43dbc106"}, {"url": "https://git.kernel.org/stable/c/cf21e890f56b7d0038ddaf25224e4f4c69ecd143"}, {"url": "https://git.kernel.org/stable/c/df3592e493d7f29bae4ffde9a9325de50ddf962e"}, {"url": "https://git.kernel.org/stable/c/de3629baf5a33af1919dec7136d643b0662e85ef"}], "title": "parisc: Fix double SIGFPE crash", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:58:05.217Z"}}]}}

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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"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: parisc: Se corrige el doble fallo de SIGFPE Camm not\u00f3 que en parisc una excepci\u00f3n SIGFPE bloquear\u00e1 una aplicaci\u00f3n con un segundo SIGFPE en el manejador de se\u00f1ales. Dave lo analiz\u00f3 y sucede porque glibc usa un almac\u00e9n de punto flotante de doble palabra para actualizar at\u00f3micamente los descriptores de funci\u00f3n. Como resultado del enlace diferido, llegamos a un almac\u00e9n de punto flotante en fpe_func casi inmediatamente. Cuando se establece el bit T, se produce una trampa de excepci\u00f3n de asistencia cuando el coprocesador encuentra *cualquier* instrucci\u00f3n de punto flotante excepto un almac\u00e9n doble del registro %fr0. Este \u00faltimo cancela todas las trampas pendientes. Arreglemos esto borrando el bit Trap (T) en el registro de estado FP antes de regresar al manejador de se\u00f1ales en el espacio de usuario. El problema se puede reproducir con este programa de prueba: 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(\"Se\u00f1al GOT %d con c\u00f3digo si %ld\\n\", sig, i->c\u00f3digo si); } 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 Excepci\u00f3n de punto flotante root@parisc:~# strace -f ./a.out execve(\"./a.out\", [\"./a.out\"], 0xf9ac7034 /* 20 variables */) = 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} --- +++ eliminado por SIGFPE +++ Excepci\u00f3n de punto flotante"}], "id": "CVE-2025-37991", "lastModified": "2025-12-16T20:19:43.400", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-05-20T18:15:45.997", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2a1aff3616b3b57aa4a5f8a7762cce1e82493fe6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6a098c51d18ec99485668da44294565c43dbc106"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6c639af49e9e5615a8395981eaf5943fb40acd6f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/757ba4d17b868482837c566cfefca59e2296c608"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cf21e890f56b7d0038ddaf25224e4f4c69ecd143"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/de3629baf5a33af1919dec7136d643b0662e85ef"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/df3592e493d7f29bae4ffde9a9325de50ddf962e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ec4584495868bd465fe60a3f771915c0e7ce7951"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-415"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: parisc: Fix double SIGFPE crash", "id": "2367623", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2367623"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nparisc: Fix double SIGFPE crash\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.\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.\nThe issue can be reproduced with this test program:\nroot@parisc:~# cat fpe.c\nstatic void fpe_func(int sig, siginfo_t *i, void *v) {\nsigset_t set;\nsigemptyset(&set);\nsigaddset(&set, SIGFPE);\nsigprocmask(SIG_UNBLOCK, &set, NULL);\nprintf(\"GOT signal %d with si_code %ld\\n\", sig, i->si_code);\n}\nint main() {\nstruct sigaction action = {\n.sa_sigaction = fpe_func,\n.sa_flags = SA_RESTART|SA_SIGINFO };\nsigaction(SIGFPE, &action, 0);\nfeenableexcept(FE_OVERFLOW);\nreturn printf(\"%lf\\n\",1.7976931348623158E308*1.7976931348623158E308);\n}\nroot@parisc:~# gcc fpe.c -lm\nroot@parisc:~# ./a.out\nFloating point exception\nroot@parisc:~# strace -f ./a.out\nexecve(\"./a.out\", [\"./a.out\"], 0xf9ac7034 /* 20 vars */) = 0\ngetrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM_INFINITY}) = 0\n...\nrt_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 +++\nFloating point exception"], "name": "CVE-2025-37991", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-05-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-37991\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-37991\nhttps://lore.kernel.org/linux-cve-announce/2025052000-CVE-2025-37991-c6dc@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-06-24T09:44:22.751347+00:00", "updated": "2025-06-24T09:44:22.751395+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}