{
  "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"
            },
            {
              "fixed": "7.1.5-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  ipv4: igmp: Fix potential memory leaks in igmp_mod_timer() and igmp_stop_timer()  When a timer is deleted and not re-armed in igmp_mod_timer(), or stopped in igmp_stop_timer(), the code currently decrements the reference counter of the multicast list entry @im using refcount_dec(\u0026im-\u003erefcnt).  However, both functions can be called from the RCU reader path: - igmp_mod_timer() via igmp_heard_query() -\u003e for_each_pmc_rcu() - igmp_stop_timer() via igmp_rcv() -\u003e igmp_heard_report()  If the group im was concurrently removed from the list by ip_mc_dec_group(), its reference count might have already been decremented to 1.  In this case, timer_delete() succeeds, and refcount_dec() decrements the refcount from 1 to 0. Since refcount_dec() does not free the object when it hits 0 (unlike ip_ma_put()), the im structure is leaked.  Fix this by using ip_ma_put(im) instead of refcount_dec(\u0026im-\u003erefcnt), and deferring the put until after the spinlock is released.",
  "id": "DEBIAN-CVE-2026-72321",
  "modified": "2026-09-14T16:47:38.234013279Z",
  "published": "2026-08-15T06:22:05.103Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-72321"
    }
  ],
  "upstream": [
    "CVE-2026-72321"
  ]
}