CVE-2026-98951 (GCVE-0-2026-98951)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:19 – Updated: 2026-10-23 12:19
VLAI
Title
riscv: ptrace: Zero-initialize regset buffers before copyin
Summary
In the Linux kernel, the following vulnerability has been resolved: riscv: ptrace: Zero-initialize regset buffers before copyin user_regset_copyin() only copies `count` bytes, so a PTRACE_SETREGSET request with a short iov_len leaves the rest of the stack buffer uninitialized. In riscv_vr_set() that garbage is validated and copied into the target's vstate, and in riscv_cfi_set() it can be stored as the target's shadow stack pointer. Zero both buffers, as the get path already does.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7067 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9300f00439743c4a34d735e1a27118eb68a1504e , < 89fc70d73f4ac8781f9e15edd1dbc6b6088453b3 (git)
Affected: 9300f00439743c4a34d735e1a27118eb68a1504e , < 59052a88ba5fe4a7bb34b3a0a42aa5d453d3bb97 (git)
Affected: f2a9cd050901c4734bc175294c3bd6a40a1a9e99 (git)
Affected: 6.5.3 , < 6.6 (semver)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 7.2.11 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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          "programFiles": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: ptrace: Zero-initialize regset buffers before copyin\n\nuser_regset_copyin() only copies `count` bytes, so a PTRACE_SETREGSET\nrequest with a short iov_len leaves the rest of the stack buffer\nuninitialized. In riscv_vr_set() that garbage is validated and copied\ninto the target\u0027s vstate, and in riscv_cfi_set() it can be stored as\nthe target\u0027s shadow stack pointer. Zero both buffers, as the get path\nalready does."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-10-23T12:19:10.747Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2026-98951",
    "datePublished": "2026-10-23T12:19:10.747Z",
    "dateReserved": "2026-09-25T10:25:14.382Z",
    "dateUpdated": "2026-10-23T12:19:10.747Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: ptrace: Zero-initialize regset buffers before copyin\n\nuser_regset_copyin() only copies `count` bytes, so a PTRACE_SETREGSET\nrequest with a short iov_len leaves the rest of the stack buffer\nuninitialized. In riscv_vr_set() that garbage is validated and copied\ninto the target\u0027s vstate, and in riscv_cfi_set() it can be stored as\nthe target\u0027s shadow stack pointer. Zero both buffers, as the get path\nalready does."
          }
        ],
        "id": "CVE-2026-98951",
        "lastModified": "2026-10-23T13:17:16.267",
        "metrics": {},
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        "vulnStatus": "Received"
      }
    }
  }
}



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