{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kernel/ptrace.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a9e7743b1067ea38c4ad2665d40c3c4a920ad9a9",
              "status": "affected",
              "version": "a5cd110cb8369d6b37ef5ccfe56b3fa1338c9615",
              "versionType": "git"
            },
            {
              "lessThan": "332c9c1a148d0425326989c1187face8f6b2a60c",
              "status": "affected",
              "version": "a5cd110cb8369d6b37ef5ccfe56b3fa1338c9615",
              "versionType": "git"
            },
            {
              "lessThan": "ce17c651a90e242ad48df0df89b1e4cebcda5e14",
              "status": "affected",
              "version": "a5cd110cb8369d6b37ef5ccfe56b3fa1338c9615",
              "versionType": "git"
            },
            {
              "lessThan": "e9e2854fcff5733ffc607e8ecc87e0e591ab41fd",
              "status": "affected",
              "version": "a5cd110cb8369d6b37ef5ccfe56b3fa1338c9615",
              "versionType": "git"
            },
            {
              "lessThan": "f433869f23841a50455c4087d85540d5b4d37cde",
              "status": "affected",
              "version": "a5cd110cb8369d6b37ef5ccfe56b3fa1338c9615",
              "versionType": "git"
            },
            {
              "lessThan": "88b839ce497ccb1ff92f7ae742c78dd2937ba572",
              "status": "affected",
              "version": "a5cd110cb8369d6b37ef5ccfe56b3fa1338c9615",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kernel/ptrace.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.8"
            },
            {
              "lessThan": "4.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.114",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.191",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.114",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.57",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: ptrace: Keep \u0027orig_x0\u0027 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\u0027orig_x0\u0027 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 \u0027orig_x0\u0027 is kept up to date with x0 whenever we\u0027re stopped on the\nsyscall entry path."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The attacker-controlled value is x0 written by ptrace(PTRACE_SETREGSET, NT_PRSTATUS) into gpr_set() while the tracee is stopped in syscall_trace_enter() after ptrace_report_syscall_entry() or ptrace_event(PTRACE_EVENT_SECCOMP) from SECCOMP_RET_TRACE. That write is a local ptrace syscall, not a received protocol message.\nAC:L - The tracer owns the stop: waitpid() for the PTRACE_SYSCALL enter-stop or PTRACE_EVENT_SECCOMP trap, PTRACE_SETREGSET to replace regs[0], then PTRACE_CONT. el0_svc_common() then reaches secure_computing() with orig_x0 still equal to the pre-ptrace x0. No race or uninfluenced layout is required.\nPR:L - __ptrace_may_access() allows a same-uid tracer, and default yama ptrace_scope (YAMA_SCOPE_RELATIONAL) permits PTRACE_TRACEME or PTRACE_ATTACH to a descendant without CAP_SYS_PTRACE. An ordinary user can fork, trace the child, and issue PTRACE_SETREGSET; init-namespace root is not required.\nUI:N - The attacker issues PTRACE_TRACEME/PTRACE_SYSCALL, PTRACE_SETREGSET of NT_PRSTATUS, and the in-flight syscall on their own descendant. No separate victim action such as mounting a filesystem or opening a file is required.\nS:C - populate_seccomp_data() exposes orig_x0 as sd.args[0] to a parent-installed seccomp filter (container runtime, systemd RestrictNamespaces, Android minijail). gpr_set() updates regs[0] without orig_x0, so invoke_syscall() via SC_ARM64_REGS_TO_ARGS runs a denied first argument while the filter still allows the old orig_x0, escaping that sandbox.\nC:H - syscall_get_arguments() returns stale orig_x0 to seccomp while __arm64_sys_* wrappers take regs[0]. A tracer starts an allowed openat(dfd) or socket(domain) and replaces x0 with a blocked directory fd or AF_NETLINK/AF_PACKET, so the syscall discloses files or netlink state the filter was written to deny.\nI:H - arm64 clone() takes clone_flags in x0 (CONFIG_CLONE_BACKWARDS). After gpr_set() writes regs[0] without orig_x0, __seccomp_filter() (including the SECCOMP_RET_TRACE recheck) still sees the allowed flags while invoke_syscall() honors CLONE_NEWUSER/CLONE_NEWNS the policy forbade; substituting write/ioctl\u0027s fd in x0 likewise modifies data the filter blocked.\nA:N - The bug is orig_x0 remaining stale after gpr_set() so populate_seccomp_data() and audit_syscall_entry() inspect the wrong first argument. That is a seccomp/audit policy bypass, not memory corruption, and it does not oops, panic, deadlock, or hang the kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:35:19.601Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a9e7743b1067ea38c4ad2665d40c3c4a920ad9a9"
        },
        {
          "url": "https://git.kernel.org/stable/c/332c9c1a148d0425326989c1187face8f6b2a60c"
        },
        {
          "url": "https://git.kernel.org/stable/c/ce17c651a90e242ad48df0df89b1e4cebcda5e14"
        },
        {
          "url": "https://git.kernel.org/stable/c/e9e2854fcff5733ffc607e8ecc87e0e591ab41fd"
        },
        {
          "url": "https://git.kernel.org/stable/c/f433869f23841a50455c4087d85540d5b4d37cde"
        },
        {
          "url": "https://git.kernel.org/stable/c/88b839ce497ccb1ff92f7ae742c78dd2937ba572"
        }
      ],
      "title": "arm64: ptrace: Keep \u0027orig_x0\u0027 in-sync with x0 on syscall entry",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90347",
    "datePublished": "2026-09-17T16:08:56.232Z",
    "dateReserved": "2026-09-11T19:38:34.805Z",
    "dateUpdated": "2026-10-30T12:35:19.601Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}