UnratedFix available

ring-buffer: Check resize_disabled before publishing the new subbuf order

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Check resize_disabled before publishing the new subbuf order ring_buffer_subbuf_order_set() stores the new order and only then walks the CPUs, returning -EBUSY if any of them has resizing disabled. A user mapped buffer has resizing disabled, and __rb_map_vma() reads buffer->subbuf_order without buffer->mutex, so an mmap of an already mapped CPU racing the failing order change sizes the mapping with the new order and inserts pages past the sub-buffer into the VMA. Check the CPUs before storing the new order.

Products: Kernel
Affected versions: Not specified
Fixed versions: 6.12.111, 6.18.53, 7.2.7
CVEs: CVE-2026-97617
Confirmed fixed CVEs: Not specified
Updated in this feed: 7 Nov 2026, 11:03 UTC · Revision 1

Source evidence

ring-buffer: Check resize_disabled before publishing the new subbuf order

core-osv · Original source

Published 25 Sept 2026, 10:22 UTC

osv:CVE-2026-97617

Kernel

Fixed versions: 6.12.111, 6.18.53, 7.2.7

Complete source record

{
  "id": "1f2906254ca2fa0a784636ae7fcb56cfc56b3cb3527eb0450fece599956b6d14",
  "url": "https://osv.dev/vulnerability/CVE-2026-97617",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ring-buffer: Check resize_disabled before publishing the new subbuf order",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Check resize_disabled before publishing the new subbuf order ring_buffer_subbuf_order_set() stores the new order and only then walks the CPUs, returning -EBUSY if any of them has resizing disabled. A user mapped buffer has resizing disabled, and __rb_map_vma() reads buffer->subbuf_order without buffer->mutex, so an mmap of an already mapped CPU racing the failing order change sizes the mapping with the new order and inserts pages past the sub-buffer into the VMA. Check the CPUs before storing the new order.",
    "evidence": "osv:CVE-2026-97617",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.111",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.53",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-97617",
      "aliases": [
        "CVE-2026-97617"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "117c39200d9d760cbd5944bb89efb7b9c51965aa"
                },
                {
                  "fixed": "f2099644e1b2a2c0805c5240d63ab0522d9d0174"
                },
                {
                  "fixed": "9fd4ea952e6ac12a63c3fe89f08ad02771aa2c06"
                },
                {
                  "fixed": "32bf47db9237c5b8b6f6aaa5356bb4c79d241f76"
                },
                {
                  "fixed": "d860c67c051685abb0460b593b193f0f45f4fa92"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97617.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.10.0"
                },
                {
                  "fixed": "6.12.111"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.53"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.7"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97617.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.547768346Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/32bf47db9237c5b8b6f6aaa5356bb4c79d241f76",
        "https://git.kernel.org/stable/c/9fd4ea952e6ac12a63c3fe89f08ad02771aa2c06",
        "https://git.kernel.org/stable/c/d860c67c051685abb0460b593b193f0f45f4fa92",
        "https://git.kernel.org/stable/c/f2099644e1b2a2c0805c5240d63ab0522d9d0174",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97617.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-97617",
        "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/2026/97xxx/CVE-2026-97617.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-97617",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 519072,
  "published_at": "2026-09-25T10:22:24.436+00:00"
}