{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "e0ea34158ee8c4f7536cd781010339ff28c0d24c"
            },
            {
              "fixed": "95e8ae9af2a61b4e72f5c585bf4c7d8aaf2a2c98"
            },
            {
              "fixed": "ca9ed40f28949353911dcb524ff8fff2f3409c97"
            },
            {
              "fixed": "e42c755582f0960e684298762f0ab927b3778376"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.17.0"
            },
            {
              "fixed": "6.18.33"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52971.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ena: PHC: Fix potential use-after-free in get_timestamp\n\nMove the phc-\u003eactive check and resp pointer assignment to after\nacquiring the spinlock. Previously, phc-\u003eactive was checked without\nholding the lock, and resp was cached from ena_dev-\u003ephc.virt_addr\nbefore the lock was acquired.\n\nIf ena_com_phc_destroy() runs between the lockless active check and\nthe lock acquisition, it sets active=false, releases the lock, frees\nthe DMA memory, and sets virt_addr=NULL. The get_timestamp path would\nthen read a NULL virt_addr and dereference it.\n\nWith both the active check and the pointer read under the lock,\ndestroy cannot free the memory while get_timestamp is using it.",
  "id": "CVE-2026-52971",
  "modified": "2026-07-08T05:38:08.079636723Z",
  "published": "2026-06-24T16:28:49.637Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/95e8ae9af2a61b4e72f5c585bf4c7d8aaf2a2c98"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca9ed40f28949353911dcb524ff8fff2f3409c97"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e42c755582f0960e684298762f0ab927b3778376"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52971.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52971"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "net: ena: PHC: Fix potential use-after-free in get_timestamp"
}