{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "621191d709b14882270dfd8ea5d7d6cdfebe2c35"
            },
            {
              "fixed": "72a90ce4918b5a2d4820fe20677ba9af780d8826"
            },
            {
              "fixed": "4529a41a675b96e0f876eef1cc93a31a57cb4d18"
            },
            {
              "fixed": "0762262ac3e70f65b3bb843fe892f8bac1562d08"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.15.0"
            },
            {
              "fixed": "6.18.44"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80896.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmshv: Fix race in mshv_irqfd_deassign\n\nmshv_irqfd_deactivate() and the hlist traversal of pt_irqfds_list\nrequire pt-\u003ept_irqfds_lock to be held, but mshv_irqfd_deassign()\nomits it. This races with the EPOLLHUP path in mshv_irqfd_wakeup(),\nwhich does take the lock before calling mshv_irqfd_deactivate().\n\nAdditionally, mshv_irqfd_deactivate() uses hlist_del() which poisons\nthe node pointers rather than resetting them. Since\nmshv_irqfd_is_active() relies on hlist_unhashed() (checks pprev ==\nNULL), a poisoned node still appears active. If a concurrent path calls\nmshv_irqfd_deactivate() again on the same irqfd, the guard fails to\nprevent a double hlist_del() on poisoned pointers.\n\nFix both issues:\n- Add the missing spin_lock_irq/spin_unlock_irq around the list\n  traversal in mshv_irqfd_deassign(), matching mshv_irqfd_release().\n- Use hlist_del_init() instead of hlist_del() so the node is properly\n  marked as unhashed after removal, making the is_active guard reliable.",
  "id": "CVE-2026-80896",
  "modified": "2026-09-06T03:30:44.348669645Z",
  "published": "2026-09-04T17:11:11.689Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0762262ac3e70f65b3bb843fe892f8bac1562d08"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4529a41a675b96e0f876eef1cc93a31a57cb4d18"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/72a90ce4918b5a2d4820fe20677ba9af780d8826"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80896.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80896"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "mshv: Fix race in mshv_irqfd_deassign"
}