{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "5ff3b30ab57da82d8db4f14662a2858cabfbc2c0"
            },
            {
              "fixed": "ef7048d8a614c5f5a9b20513a5428101a744514e"
            },
            {
              "fixed": "8ed3ddf23d39bf5338406bd9f8863d44748cf6ce"
            },
            {
              "fixed": "5dc59fc959b2b5742985d7ef24bccd1868217dc2"
            },
            {
              "fixed": "a2fb8222cde23b0001812ed3acb7c0ea36dd94e2"
            },
            {
              "fixed": "18799e858b407bf355383c9dd6c06477aa437134"
            },
            {
              "fixed": "e11f5b48c82703242a3be7a7ae4b4940b4cb4610"
            },
            {
              "fixed": "22670d1552fe155822b2abf91f920925f7d067b4"
            },
            {
              "fixed": "f8c9a3ec36b4ee3d4701b9be08f40e7bfbf89761"
            },
            {
              "fixed": "2eed77fdcb0cc48e8eccb2bcd4b7f2c6d650e84c"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.8.0"
            },
            {
              "fixed": "5.10.269"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.220"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.185"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.154"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.106"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.47"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.11"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "7.2.0"
            },
            {
              "fixed": "7.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80916.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nkcov: fix data corruption and race conditions on PREEMPT_RT\n\nsyzbot is reporting KCOV state corruption on PREEMPT_RT kernels, for the\ntemporary storage used for saving/restoring remote KCOV state is currently\nallocated as the per-CPU area.\n\nOn PREEMPT_RT kernels, softirq handlers run as preemptible task threads\n(e.g., ksoftirqd). If a softirq context preempts a task running a remote\nKCOV session, it safely saves the task's state into the per-CPU area.\nHowever, if that softirq thread is subsequently preempted by a higher-\npriority softirq thread on the same CPU, the second softirq will overwrite\nthe same per-CPU area, permanently destroying the original task's KCOV\nstate.\n\nFix this data corruption by moving the temporary storage from the per-CPU\narea to the per-thread area. Since each softirq thread now owns its own\ntask context, nested softirq preemption no longer causes data overwrites.\n\nNote that while the temporary storage is now on a per-thread basis, the\nper-CPU kcov_percpu_data.lock must be retained, for we need to ensure that\nkcov_remote_start() and kcov_remote_stop() operate atomically without\nracing against asynchronous interrupts that manipulate the current task's\nKCOV state.\n\nIt is likely that GFP_KERNEL allocation by vmalloc_node() in kcov_init()\nhas already called panic() before returning NULL, for there will be no\nOOM-killable userspace processes when __init function of built-in module\nruns. But this patch also fixes crashing the kernel when vmalloc_node()\nin kcov_init() returned NULL, for kcov_init() left per-CPU irq_area == NULL\nbut kcov_remote_start() depends on per-CPU irq_area != NULL, resulting in\n\n  (1) doing vmalloc() in kcov_remote_start() despite !in_task() context\n\n  (2) out-of-array-bounds access if (1) succeeded but\n      kcov-\u003eremote_size \u003c CONFIG_KCOV_IRQ_AREA_SIZE\n\n  (3) always leak memory allocated by (1), eventually killing all\n      OOM-killable userspace processes\n\nproblems.",
  "id": "CVE-2026-80916",
  "modified": "2026-09-11T03:30:57.388908156Z",
  "published": "2026-09-09T16:13:14.587Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18799e858b407bf355383c9dd6c06477aa437134"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/22670d1552fe155822b2abf91f920925f7d067b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2eed77fdcb0cc48e8eccb2bcd4b7f2c6d650e84c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5dc59fc959b2b5742985d7ef24bccd1868217dc2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ed3ddf23d39bf5338406bd9f8863d44748cf6ce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a2fb8222cde23b0001812ed3acb7c0ea36dd94e2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e11f5b48c82703242a3be7a7ae4b4940b4cb4610"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ef7048d8a614c5f5a9b20513a5428101a744514e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f8c9a3ec36b4ee3d4701b9be08f40e7bfbf89761"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80916.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80916"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "kcov: fix data corruption and race conditions on PREEMPT_RT"
}