# CVE-2026-90347: arm64: ptrace: Keep 'orig_x0' in-sync with x0 on syscall entry CVE-2026-90347 is fixed in 19 products on 1 platform, first by ALAS2023-2026-2143, released September 14, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-90347 - Priority: High - CVSS: 8.4 (Important) - EPSS: 0.0016 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Sep 14, 2026 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-90347 ## Description 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool amzn 2023 | 1:6.1.186-228.374.amzn2023 | [ALAS2023-2026-2143](https://patchblox.com/security/data/fix/linux/alas2023-2026-2143.md) | Sep 14, 2026 | | Linux | bpftool-debuginfo amzn 2023 | 1:6.1.186-228.374.amzn2023 | [ALAS2023-2026-2143](https://patchblox.com/security/data/fix/linux/alas2023-2026-2143.md) | Sep 14, 2026 | | Linux | kernel amzn 2023 | 1:6.1.186-228.374.amzn2023 | [ALAS2023-2026-2143](https://patchblox.com/security/data/fix/linux/alas2023-2026-2143.md) | Sep 14, 2026 | | Linux | kernel-debuginfo amzn 2023 | 1:6.1.186-228.374.amzn2023 | [ALAS2023-2026-2143](https://patchblox.com/security/data/fix/linux/alas2023-2026-2143.md) | Sep 14, 2026 | | Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 1:6.1.186-228.374.amzn2023 | [ALAS2023-2026-2143](https://patchblox.com/security/data/fix/linux/alas2023-2026-2143.md) | Sep 14, 2026 | | Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 1:6.1.186-228.374.amzn2023 | [ALAS2023-2026-2143](https://patchblox.com/security/data/fix/linux/alas2023-2026-2143.md) | Sep 14, 2026 | | Linux | kernel-devel amzn 2023 | 1:6.1.186-228.374.amzn2023 | [ALAS2023-2026-2143](https://patchblox.com/security/data/fix/linux/alas2023-2026-2143.md) | Sep 14, 2026 | | Linux | kernel-headers amzn 2023 | 1:6.1.186-228.374.amzn2023 | [ALAS2023-2026-2143](https://patchblox.com/security/data/fix/linux/alas2023-2026-2143.md) | Sep 14, 2026 | | Linux | kernel-livepatch-6.1.186-228.374 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-2143](https://patchblox.com/security/data/fix/linux/alas2023-2026-2143.md) | Sep 14, 2026 | | Linux | kernel-modules-extra amzn 2023 | 1:6.1.186-228.374.amzn2023 | [ALAS2023-2026-2143](https://patchblox.com/security/data/fix/linux/alas2023-2026-2143.md) | Sep 14, 2026 | | Linux | kernel-modules-extra-common amzn 2023 | 1:6.1.186-228.374.amzn2023 | [ALAS2023-2026-2143](https://patchblox.com/security/data/fix/linux/alas2023-2026-2143.md) | Sep 14, 2026 | | Linux | kernel-tools amzn 2023 | 1:6.1.186-228.374.amzn2023 | [ALAS2023-2026-2143](https://patchblox.com/security/data/fix/linux/alas2023-2026-2143.md) | Sep 14, 2026 | | Linux | kernel-tools-debuginfo amzn 2023 | 1:6.1.186-228.374.amzn2023 | [ALAS2023-2026-2143](https://patchblox.com/security/data/fix/linux/alas2023-2026-2143.md) | Sep 14, 2026 | | Linux | kernel-tools-devel amzn 2023 | 1:6.1.186-228.374.amzn2023 | [ALAS2023-2026-2143](https://patchblox.com/security/data/fix/linux/alas2023-2026-2143.md) | Sep 14, 2026 | | Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-90347](https://patchblox.com/security/data/fix/linux/debian-cve-2026-90347.md) | Sep 23, 2026 | | Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-90347](https://patchblox.com/security/data/fix/linux/debian-cve-2026-90347.md) | Sep 23, 2026 | | Linux | perf amzn 2023 | 1:6.1.186-228.374.amzn2023 | [ALAS2023-2026-2143](https://patchblox.com/security/data/fix/linux/alas2023-2026-2143.md) | Sep 14, 2026 | | Linux | perf-debuginfo amzn 2023 | 1:6.1.186-228.374.amzn2023 | [ALAS2023-2026-2143](https://patchblox.com/security/data/fix/linux/alas2023-2026-2143.md) | Sep 14, 2026 | | Linux | python3-perf amzn 2023 | 1:6.1.186-228.374.amzn2023 | [ALAS2023-2026-2143](https://patchblox.com/security/data/fix/linux/alas2023-2026-2143.md) | Sep 14, 2026 | | Linux | python3-perf-debuginfo amzn 2023 | 1:6.1.186-228.374.amzn2023 | [ALAS2023-2026-2143](https://patchblox.com/security/data/fix/linux/alas2023-2026-2143.md) | Sep 14, 2026 | --- Data as of 2026-11-08T06:59:42Z UTC. 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