net: psp: check for device unregister when creating assoc

{
  "id": "79a477048969b0c03895d2e73ad3105332c5c2d7760921afde91d9d6b00487fa",
  "url": "https://osv.dev/vulnerability/CVE-2026-52979",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: psp: check for device unregister when creating assoc",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: psp: check for device unregister when creating assoc psp_assoc_device_get_locked() obtains a psp_dev reference via psp_dev_get_for_sock() (which uses psp_dev_tryget() under RCU); it then acquires psd->lock and drops the reference. Before the lock is taken, psp_dev_unregister() can run to completion: take psd->lock, clear out state, unlock, drop the registration reference. The expectation is that the lock prevents device unregistration, but much like with netdevs special care has to be taken when \"upgrading\" a reference to a locked device. Add the missing check if device is still alive. psp_dev_is_registered() exists already but had no callers, which makes me wonder if I either forgot to add this or lost the check during refactoring...",
    "evidence": "osv:CVE-2026-52979",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.33",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-52979",
      "aliases": [
        "CVE-2026-52979"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6b46ca260e2290e3453d1355ab5b6d283d73d780"
                },
                {
                  "fixed": "d90df5ce6deb2424de3ad89bcc693ac1b67accc9"
                },
                {
                  "fixed": "e201c57073e624dd2ba5beaf9eda31e19b77b332"
                },
                {
                  "fixed": "b89769f936a8fa9e66de72ddc1b71a9745a488e6"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52979.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.18.0"
                },
                {
                  "fixed": "6.18.33"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52979.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.486820098Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/b89769f936a8fa9e66de72ddc1b71a9745a488e6",
        "https://git.kernel.org/stable/c/d90df5ce6deb2424de3ad89bcc693ac1b67accc9",
        "https://git.kernel.org/stable/c/e201c57073e624dd2ba5beaf9eda31e19b77b332",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52979.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-52979",
        "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/2026/52xxx/CVE-2026-52979.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-52979",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 500265,
  "published_at": "2026-06-24T16:28:55.696+00:00"
}