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riscv: fix race when vmap stack overflow

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: riscv: fix race when vmap stack overflow Currently, when detecting vmap stack overflow, riscv firstly switches to the so called shadow stack, then use this shadow stack to call the get_overflow_stack() to get the overflow stack. However, there's a race here if two or more harts use the same shadow stack at the same time. To solve this race, we introduce spin_shadow_stack atomic var, which will be swap between its own address and 0 in atomic way, when the var is set, it means the shadow_stack is being used; when the var is cleared, it means the shadow_stack isn't being used. [Palmer: Add AQ to the swap, and also some comments.]

Products
Kernel
Affected versions
Not specified
Fixed versions
5.15.82, 6.0.12
CVEs
CVE-2022-49001
Confirmed fixed CVEs
Not specified
Updated in this feed
5 Nov 2026, 05:30 UTC · Revision 1

Source evidence

riscv: fix race when vmap stack overflow

core-osv · Original source

Published 21 Oct 2024, 20:06 UTC

In the Linux kernel, the following vulnerability has been resolved: riscv: fix race when vmap stack overflow Currently, when detecting vmap stack overflow, riscv firstly switches to the so called shadow stack, then use this shadow stack to call the get_overflow_stack() to get the overflow stack. However, there's a race here if two or more harts use the same shadow stack at the same time. To solve this race, we introduce spin_shadow_stack atomic var, which will be swap between its own address and 0 in atomic way, when the var is set, it means the shadow_stack is being used; when the var is cleared, it means the shadow_stack isn't being used. [Palmer: Add AQ to the swap, and also some comments.]

osv:CVE-2022-49001

Kernel

Fixed versions: 5.15.82, 6.0.12

Complete source record
{
  "id": "2f6e7dcf99117d989fa7f3f80a49b4aed58539ef89884af098e1c27f00125083",
  "url": "https://osv.dev/vulnerability/CVE-2022-49001",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "riscv: fix race when vmap stack overflow",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: riscv: fix race when vmap stack overflow Currently, when detecting vmap stack overflow, riscv firstly switches to the so called shadow stack, then use this shadow stack to call the get_overflow_stack() to get the overflow stack. However, there's a race here if two or more harts use the same shadow stack at the same time. To solve this race, we introduce spin_shadow_stack atomic var, which will be swap between its own address and 0 in atomic way, when the var is set, it means the shadow_stack is being used; when the var is cleared, it means the shadow_stack isn't being used. [Palmer: Add AQ to the swap, and also some comments.]",
    "evidence": "osv:CVE-2022-49001",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.82",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.0.12",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2022-49001",
      "aliases": [
        "CVE-2022-49001"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "31da94c25aea835ceac00575a9fd206c5a833fed"
                },
                {
                  "fixed": "ac00301adb19df54f2eae1efc4bad7447c0156ce"
                },
                {
                  "fixed": "879fabc5a95401d9bce357e4b1d24ae4a360a81f"
                },
                {
                  "fixed": "7e1864332fbc1b993659eab7974da9fe8bf8c128"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49001.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.14.0"
                },
                {
                  "fixed": "5.15.82"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.0.12"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49001.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:43.025873987Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/7e1864332fbc1b993659eab7974da9fe8bf8c128",
        "https://git.kernel.org/stable/c/879fabc5a95401d9bce357e4b1d24ae4a360a81f",
        "https://git.kernel.org/stable/c/ac00301adb19df54f2eae1efc4bad7447c0156ce",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49001.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49001",
        "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/2022/49xxx/CVE-2022-49001.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-49001",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 510726,
  "published_at": "2024-10-21T20:06:15.443+00:00"
}