{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  blk-cgroup: skip dying blkg in blkcg_activate_policy()  When switching IO schedulers on a block device, blkcg_activate_policy() can race with concurrent blkcg deletion, leading to a use-after-free in rcu_accelerate_cbs.  T1:                               T2:                                   blkg_destroy                                   kill(\u0026blkg-\u003erefcnt) // blkg-\u003erefcnt=1-\u003e0                                   blkg_release // call_rcu(__blkg_release)                                   ...                                   blkg_free_workfn                                   -\u003epd_free_fn(pd) elv_iosched_store elevator_switch ... iterate blkg list blkg_get(blkg) // blkg-\u003erefcnt=0-\u003e1                                   list_del_init(\u0026blkg-\u003eq_node) blkg_put(pinned_blkg) // blkg-\u003erefcnt=1-\u003e0 blkg_release // call_rcu again rcu_accelerate_cbs // uaf  Fix this by checking hlist_unhashed(\u0026blkg-\u003eblkcg_node) before getting a reference to the blkg. This is the same check used in blkg_destroy() to detect if a blkg has already been destroyed. If the blkg is already unhashed, skip processing it since it's being destroyed.",
  "id": "DEBIAN-CVE-2026-90325",
  "modified": "2026-09-18T04:47:38.555406469Z",
  "published": "2026-09-17T17:17:30.540Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-90325"
    }
  ],
  "upstream": [
    "CVE-2026-90325"
  ]
}