{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "0f383b6dc96e976dfbf2721b0bf10bd96103b341"
            },
            {
              "fixed": "af28d801cd2db4cc7378554499bd4a5d84a5517e"
            },
            {
              "fixed": "9d1fcd64ab81200e02b7a6db5eb1da8e244e8289"
            },
            {
              "fixed": "3cfaac77b3c32ac3940df28866de263c3f45d24c"
            },
            {
              "fixed": "1f0d56d3f1e88f20f6e46109402f8c15d59bac37"
            },
            {
              "fixed": "633cadbc0b8323f5cc140a285d2432089dbb534e"
            },
            {
              "fixed": "83f9fb561c1c3917e19f95523dd933c7d30291aa"
            },
            {
              "fixed": "89038cc87d80c77e7aa6f42a64b2573b74af339f"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.15.0"
            },
            {
              "fixed": "5.15.217"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.184"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.148"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.101"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72069.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlocking/rt: Fix the incorrect RCU protection in rt_spin_unlock()\n\nrt_spin_unlock() releases the RCU protection before unlocking the\nlock. That opens the door for the following UAF scenario:\n\n T1\t\t\t\t\tT2\n spin_lock(\u0026p-\u003elock);\t\trcu_read_lock();\n invalidate(p);\t\t\tp = rcu_dereference(ptr);\n rcu_assign_pointer(ptr, NULL);\tif (!p) return;\n spin_unlock(\u0026p-\u003elock);\t\tspin_lock(\u0026p-\u003elock)\n \t\t\t\t   lock(\u0026lock-\u003elock);\n\t\t\t\t   rcu_read_lock();\n kfree_rcu(p);\t\t\trcu_read_unlock();\n\t\t\t\t....\n\t\t\t\tspin_unlock(\u0026p-\u003elock)\n\t\t\t\t  rcu_read_unlock(); // Ends grace period\n rcu_do_batch()\n   kfree(p);\n\t\t\t    UAF -\u003e\t  rt_mutex_cmpxchg_release(\u0026lock-\u003elock...)\n\nRegular spinlocks keep preemption disabled accross the unlock operation,\nwhich provides full RCU protection, but the RT substitution fails to\nresemble that. Same applies for the rwlock substitution.\n\nMove the rcu_read_unlock() invocation past the unlock operations to match\nthe non-RT semantics. This makes it asymmetric vs. rt_xxx_lock(), but\nthat's harmless as the caller needs to hold RCU read lock across the lock\noperation. The migrate_enable() call stays before the unlock operation\nbecause there is no per CPU operation in the unlock path which would\nrequire migration to be kept disabled.",
  "id": "CVE-2026-72069",
  "modified": "2026-08-25T03:51:45.884671055Z",
  "published": "2026-08-15T05:52:21.752Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f0d56d3f1e88f20f6e46109402f8c15d59bac37"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3cfaac77b3c32ac3940df28866de263c3f45d24c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/633cadbc0b8323f5cc140a285d2432089dbb534e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/83f9fb561c1c3917e19f95523dd933c7d30291aa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/89038cc87d80c77e7aa6f42a64b2573b74af339f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9d1fcd64ab81200e02b7a6db5eb1da8e244e8289"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/af28d801cd2db4cc7378554499bd4a5d84a5517e"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72069.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72069"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "locking/rt: Fix the incorrect RCU protection in rt_spin_unlock()"
}