{"id":"CVE-2026-90347","summary":"arm64: ptrace: Keep 'orig_x0' in-sync with x0 on syscall entry","details":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64: ptrace: Keep 'orig_x0' in-sync with x0 on syscall entry\n\nCommit e057b9477232 (\"arm64: syscall: Ensure saved x0 is kept in-sync\nwith tracer updates\") attempted to resolve a long-standing issue with\nsyscall entry tracing, where a tracer is able to manipulate the first\nsyscall argument without being subjected to seccomp or audit checking.\n\nUnfortunately, that fix was incomplete [1], as it failed to update\n'orig_x0' between a tracer updating x0 during a seccomp ptrace exit\n(SECCOMP_RET_TRACE) and the seccomp filter being re-evaluated.\n\nRather than add hooks to the core seccomp code, instead move the\nsynchronisation code into the ptrace GPR and syscall setting code so\nthat 'orig_x0' is kept up to date with x0 whenever we're stopped on the\nsyscall entry path.","modified":"2026-09-18T03:48:37.728280300Z","published":"2026-09-17T16:08:56.232Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90347.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/88b839ce497ccb1ff92f7ae742c78dd2937ba572"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f433869f23841a50455c4087d85540d5b4d37cde"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90347.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90347"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a5cd110cb8369d6b37ef5ccfe56b3fa1338c9615"},{"fixed":"f433869f23841a50455c4087d85540d5b4d37cde"},{"fixed":"88b839ce497ccb1ff92f7ae742c78dd2937ba572"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90347.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.8.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90347.json"}}],"schema_version":"1.9.0"}