HighFix available

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

Type: advisorySources: OSV

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.

Products: Kernel
Affected versions: Not specified
Fixed versions: 6.1.191, 6.12.114, 6.18.57, 6.6.160, 7.2.6
CVEs: CVE-2026-90347
Confirmed fixed CVEs: Not specified
Updated in this feed: 2 Nov 2026, 23:08 UTC · Revision 1

Source evidence

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

core-osv · Original source

Published 17 Sept 2026, 16:08 UTC

osv:CVE-2026-90347

Kernel

Fixed versions: 6.1.191, 6.6.160, 6.12.114, 6.18.57, 7.2.6

Complete source record

{
  "id": "226a3a599f4ecc197d81a8a5f245ef975df55ec645af3cf471aace429038dcc3",
  "url": "https://osv.dev/vulnerability/CVE-2026-90347",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "arm64: ptrace: Keep 'orig_x0' in-sync with x0 on syscall entry",
    "summary": "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.",
    "evidence": "osv:CVE-2026-90347",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.191",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.160",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.114",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.57",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-90347",
      "aliases": [
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      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N"
        }
      ],
      "affected": [
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                {
                  "fixed": "f433869f23841a50455c4087d85540d5b4d37cde"
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            {
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                  "introduced": "6.7.0"
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              "type": "ECOSYSTEM",
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                  "introduced": "6.13.0"
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.6"
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              ]
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90347.json"
          }
        }
      ],
      "modified": "2026-11-01T02:31:01.036702270Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/332c9c1a148d0425326989c1187face8f6b2a60c",
        "https://git.kernel.org/stable/c/88b839ce497ccb1ff92f7ae742c78dd2937ba572",
        "https://git.kernel.org/stable/c/a9e7743b1067ea38c4ad2665d40c3c4a920ad9a9",
        "https://git.kernel.org/stable/c/ce17c651a90e242ad48df0df89b1e4cebcda5e14",
        "https://git.kernel.org/stable/c/e9e2854fcff5733ffc607e8ecc87e0e591ab41fd",
        "https://git.kernel.org/stable/c/f433869f23841a50455c4087d85540d5b4d37cde",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90347.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90347",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90347.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-90347",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490761,
  "published_at": "2026-09-17T16:08:56.232+00:00"
}