{
  "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:  ipv6: mcast: use rcu_assign_pointer() for __rcu list updates  Several places in net/ipv6/mcast.c update RCU-protected lists (np-\u003eipv6_mc_list, idev-\u003emc_list, idev-\u003emc_tomb) using direct pointer assignments instead of rcu_assign_pointer():  1. In __ipv6_dev_mc_dec(), unlinking a group from idev-\u003emc_list did:        *map = ma-\u003enext;    without rcu_assign_pointer() while concurrent readers traverse    idev-\u003emc_list locklessly under rcu_read_lock(). 2. In ipv6_sock_mc_drop() and __ipv6_sock_mc_close(), unlinking a group    from np-\u003eipv6_mc_list directly assigned *lnk = mc_lst-\u003enext and    np-\u003eipv6_mc_list = mc_lst-\u003enext without rcu_assign_pointer(), racing    with lockless readers in inet6_mc_check(). 3. In __ipv6_sock_mc_join(), mc_lst-\u003enext was initialized to    np-\u003eipv6_mc_list via raw assignment before publishing mc_lst. 4. In mld_del_delrec() and __ipv6_dev_mc_inc(), __rcu source pointers    passed into rcu_assign_pointer() lacked explicit dereference helpers.  Fix these by consistently using rcu_assign_pointer() along with mc_dereference() / sock_dereference().",
  "id": "DEBIAN-CVE-2026-98099",
  "modified": "2026-09-26T04:47:42.229110592Z",
  "published": "2026-09-25T11:17:39.723Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-98099"
    }
  ],
  "upstream": [
    "CVE-2026-98099"
  ]
}