{
  "cveId": "CVE-2026-98099",
  "url": "https://patchblox.com/security/cve/CVE-2026-98099",
  "summary": "CVE-2026-98099 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-98099, released October 2, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "ipv6: mcast: use rcu_assign_pointer() for __rcu list updates",
  "description": "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().",
  "published": "2026-09-25T11:17:39Z",
  "severity": "Moderate",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00091,
  "epssPercentile": 0.00449,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98099",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-98099",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98099",
      "released": "2026-10-02T21:04:56Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.7-1",
      "fix": "DEBIAN-CVE-2026-98099",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98099",
      "released": "2026-10-02T21:04:56Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}