{
  "cveId": "CVE-2026-89561",
  "url": "https://patchblox.com/security/cve/CVE-2026-89561",
  "summary": "CVE-2026-89561 is fixed in 74 products on 1 platform, first by DEBIAN-CVE-2026-89561, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ipv6: rpl: fix NULL dereference of idev in ipv6_...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ipv6: rpl: fix NULL dereference of idev in ipv6_rpl_srh_rcv()  ipv6_rpl_srh_rcv() dereferences idev from __in6_dev_get() without a NULL check when reading idev-\u003Ecnf.rpl_seg_enabled.  When the device\u0027s MTU drops below IPV6_MIN_MTU, addrconf_ifdown() clears dev-\u003Eip6_ptr through RCU_INIT_POINTER(). A packet that passed the idev check in ip6_rcv_core() can then reach ipv6_rpl_srh_rcv() with dev-\u003Eip6_ptr already NULL.  Reproduced by flooding the receiving interface with ping6 traffic while flapping its MTU between 1500 and 1200:   BUG: KASAN: null-ptr-deref in ipv6_rpl_srh_rcv\u002B0xb3/0x1070  Read of size 4 at addr 00000000000006b4 by task ping6/394   CPU: 2 UID: 0 PID: 394 Comm: ping6 Not tainted 7.2.0-rc7-micro-vm-dev-00095-g24ef02f934ee #240 PREEMPT(full)  Call Trace:   \u003CIRQ\u003E   kasan_report\u002B0xc6/0x100   ipv6_rpl_srh_rcv\u002B0xb3/0x1070   ip6_protocol_deliver_rcu\u002B0x759/0x9a0   ip6_input_finish\u002B0xa8/0x1b0   ip6_input\u002B0xe1/0x490   ipv6_rcv\u002B0x33d/0x460   __netif_receive_skb_one_core\u002B0xd6/0x130   process_backlog\u002B0x2cc/0xa00   __napi_poll.constprop.0\u002B0x56/0x270   net_rx_action\u002B0x327/0x730   handle_softirqs\u002B0x11e/0x630   do_softirq\u002B0xb3/0xf0   \u003C/IRQ\u003E  Both ipv6_rpl_srh_rcv() and ipv6_srh_rcv() are called only from ipv6_rthdr_rcv(), which already has an idev lookup.  Fix the NULL dereference on the RPL path by checking idev in ipv6_rthdr_rcv(), before it calls either function. The callees take idev as an argument and no longer call __in6_dev_get(), so the packet is now dropped in one place, with SKB_DROP_REASON_IPV6DISABLED on both paths.",
  "published": "2026-09-11T20:19:39Z",
  "severity": "high",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00479,
  "epssPercentile": 0.41614,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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      "fixedVersion": "1:6.18.51-120.162.amzn2023",
      "fix": "ALAS2023-2026-3187",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187",
      "released": "2026-11-07T01:06:52Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T19:38:12Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}