riscv: trace: fix snapshot deadlock with sbi ecall

{
  "id": "c9755bc53b4864052c1818c92e50f4a620816f5173d3792718825d39b1ed92c1",
  "url": "https://osv.dev/vulnerability/CVE-2026-23217",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "riscv: trace: fix snapshot deadlock with sbi ecall",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: riscv: trace: fix snapshot deadlock with sbi ecall If sbi_ecall.c's functions are traceable, echo \"__sbi_ecall:snapshot\" > /sys/kernel/tracing/set_ftrace_filter may get the kernel into a deadlock. (Functions in sbi_ecall.c are excluded from tracing if CONFIG_RISCV_ALTERNATIVE_EARLY is set.) __sbi_ecall triggers a snapshot of the ringbuffer. The snapshot code raises an IPI interrupt, which results in another call to __sbi_ecall and another snapshot... All it takes to get into this endless loop is one initial __sbi_ecall. On RISC-V systems without SSTC extension, the clock events in timer-riscv.c issue periodic sbi ecalls, making the problem easy to trigger. Always exclude the sbi_ecall.c functions from tracing to fix the potential deadlock. sbi ecalls can easiliy be logged via trace events, excluding ecall functions from function tracing is not a big limitation.",
    "evidence": "osv:CVE-2026-23217",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.114",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-23217",
      "aliases": [
        "CVE-2026-23217"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1ff95eb2bebda50c4c5406caaf201e0fcb24cc8f"
                },
                {
                  "fixed": "f8b8ec0ddde74066d4452a7a961da544f193e00f"
                },
                {
                  "fixed": "b1f8285bc8e3508c1fde23b5205f1270215d4984"
                },
                {
                  "fixed": "b0d7f5f0c9f05f1b6d4ee7110f15bef9c11f9df0"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6.10.10"
                },
                {
                  "fixed": "6.11"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "82f134ddd4f5da11c277bd1aa02e2a733179725a"
                }
              ]
            }
          ],
          "versions": [
            "v6.10.14",
            "v6.10.13",
            "v6.10.12",
            "v6.10.11",
            "v6.10.10"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23217.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.11.0"
                },
                {
                  "fixed": "6.12.114"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23217.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.139208796Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/b0d7f5f0c9f05f1b6d4ee7110f15bef9c11f9df0",
        "https://git.kernel.org/stable/c/b1f8285bc8e3508c1fde23b5205f1270215d4984",
        "https://git.kernel.org/stable/c/f8b8ec0ddde74066d4452a7a961da544f193e00f",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23217.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23217",
        "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/2026/23xxx/CVE-2026-23217.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-23217",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 494919,
  "published_at": "2026-02-18T14:21:54.878+00:00"
}