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CVE-2026-90347

arm64: ptrace: Keep 'orig_x0' in-sync with x0 on syscall entry PUBLISHED

Description (CNA)

In the Linux kernel, the following vulnerability has been resolved: arm64: ptrace: Keep 'orig_x0' in-sync with x0 on syscall entry Commit e057b9477232 ("arm64: syscall: Ensure saved x0 is kept in-sync with tracer updates") attempted to resolve a long-standing issue with syscall entry tracing, where a tracer is able to manipulate the first syscall argument without being subjected to seccomp or audit checking. Unfortunately, that fix was incomplete [1], as it failed to update 'orig_x0' between a tracer updating x0 during a seccomp ptrace exit (SECCOMP_RET_TRACE) and the seccomp filter being re-evaluated. Rather than add hooks to the core seccomp code, instead move the synchronisation code into the ptrace GPR and syscall setting code so that 'orig_x0' is kept up to date with x0 whenever we're stopped on the syscall entry path.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected a5cd110cb8369d6b37ef5ccfe56b3fa1338c9615 before 332c9c1a148d0425326989c1187face8f6b2a60c; affected a5cd110cb8369d6b37ef5ccfe56b3fa1338c9615 before ce17c651a90e242ad48df0df89b1e4cebcda5e14; affected a5cd110cb8369d6b37ef5ccfe56b3fa1338c9615 before e9e2854fcff5733ffc607e8ecc87e0e591ab41fd; affected a5cd110cb8369d6b37ef5ccfe56b3fa1338c9615 before f433869f23841a50455c4087d85540d5b4d37cde; affected a5cd110cb8369d6b37ef5ccfe56b3fa1338c9615 before 88b839ce497ccb1ff92f7ae742c78dd2937ba572
Linux / Linuxaffected 4.8; unaffected 0 before 4.8; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.57 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through *

CWE

No CWE identifiers supplied.

References