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firmware: arm_scmi: Fix NULL dereference on notify error path

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Fix NULL dereference on notify error path Since commit b5daf93b809d1 ("firmware: arm_scmi: Avoid notifier registration for unsupported events") the call chains leading to the helper __scmi_event_handler_get_ops expect an ERR_PTR to be returned on failure to get an handler for the requested event key, while the current helper can still return a NULL when no handler could be found or created. Fix by forcing an ERR_PTR return value when the handler reference is NULL.

Products
Kernel
Affected versions
Not specified
Fixed versions
6.18.20, 6.19.10
CVEs
CVE-2026-31544
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 17:50 UTC · Revision 1

Source evidence

firmware: arm_scmi: Fix NULL dereference on notify error path

core-osv · Original source

Published 24 Apr 2026, 14:33 UTC

In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Fix NULL dereference on notify error path Since commit b5daf93b809d1 ("firmware: arm_scmi: Avoid notifier registration for unsupported events") the call chains leading to the helper __scmi_event_handler_get_ops expect an ERR_PTR to be returned on failure to get an handler for the requested event key, while the current helper can still return a NULL when no handler could be found or created. Fix by forcing an ERR_PTR return value when the handler reference is NULL.

osv:CVE-2026-31544

Kernel

Fixed versions: 6.18.20, 6.19.10

Complete source record
{
  "id": "88ea4fc5fc771ddd0fd61004ad8f5c5655f0e8c25b3b80748cb20bba314ec150",
  "url": "https://osv.dev/vulnerability/CVE-2026-31544",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "firmware: arm_scmi: Fix NULL dereference on notify error path",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Fix NULL dereference on notify error path Since commit b5daf93b809d1 (\"firmware: arm_scmi: Avoid notifier registration for unsupported events\") the call chains leading to the helper __scmi_event_handler_get_ops expect an ERR_PTR to be returned on failure to get an handler for the requested event key, while the current helper can still return a NULL when no handler could be found or created. Fix by forcing an ERR_PTR return value when the handler reference is NULL.",
    "evidence": "osv:CVE-2026-31544",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.20",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-31544",
      "aliases": [
        "CVE-2026-31544"
      ],
      "affected": [
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              "type": "GIT",
              "events": [
                {
                  "introduced": "b5daf93b809d13a194f8a8eeacfab1cfa241bbc3"
                },
                {
                  "fixed": "70d9bd9a2e683afe6200b0c20af22f06f1a199a4"
                },
                {
                  "fixed": "8414d2800c34528467df23ce6192c254a73e4459"
                },
                {
                  "fixed": "555317d6100164748f7d09f80142739bd29f0cda"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31544.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.17.0"
                },
                {
                  "fixed": "6.18.20"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "6.19.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31544.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.480488629Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/555317d6100164748f7d09f80142739bd29f0cda",
        "https://git.kernel.org/stable/c/70d9bd9a2e683afe6200b0c20af22f06f1a199a4",
        "https://git.kernel.org/stable/c/8414d2800c34528467df23ce6192c254a73e4459",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31544.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-31544",
        "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/2026/31xxx/CVE-2026-31544.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-31544",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 505491,
  "published_at": "2026-04-24T14:33:13.173+00:00"
}