CVE-2026-90347arm64: ptrace: Keep 'orig_x0' in-sync with x0 on syscall entry
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.4 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from a5cd110cb8369d6b37ef5ccfe56b3fa1338c9615 before e9e2854fcff5733ffc607e8ecc87e0e591ab41fd; from a5cd110cb8369d6b37ef5ccfe56b3fa1338c9615 before f433869f23841a50455c4087d85540d5b4d37cde; from a5cd110cb8369d6b37ef5ccfe56b3fa1338c9615 before 88b839ce497ccb1ff92f7ae742c78dd2937ba572 | CNA record |
References
- https://git.kernel.org/stable/c/e9e2854fcff5733ffc607e8ecc87e0e591ab41fd
- https://git.kernel.org/stable/c/f433869f23841a50455c4087d85540d5b4d37cde
- https://git.kernel.org/stable/c/88b839ce497ccb1ff92f7ae742c78dd2937ba572
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.