{
  "cveId": "CVE-2026-99053",
  "url": "https://patchblox.com/security/cve/CVE-2026-99053",
  "summary": "CVE-2026-99053 is fixed in 19 products on 1 platform, first by DEBIAN-CVE-2026-99053, released October 24, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "tipc: hold a reference to nodes found by link name",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  tipc: hold a reference to nodes found by link name  tipc_node_find_by_name() returns a node after dropping its RCU read lock without taking a reference.  The LINK_SET, LINK_GET and LINK_RESET_STATS handlers then lock and access the node, racing with timer-driven cleanup of a down peer.  Generic netlink serialization does not exclude the node timer.  The following interleaving can leave a handler using a freed node:    CPU 0: find the node under RCU and release the node read lock   CPU 1: tipc_node_timeout() clears the links and unlinks the down node   CPU 1: drop the list and timer references, queuing tipc_node_free()   CPU 0: leave the RCU read-side critical section   CPU 1: complete the grace period and free the node   CPU 0: acquire the node lock through the stale pointer  LINK_SET also uses the node\u0027s media address after releasing the node lock, when passing queued packets to tipc_bearer_xmit().  KASAN on v7.3-rc5 reported:    BUG: KASAN: slab-use-after-free in _raw_read_lock_bh   Write of size 4 at addr ffff88807e06f008 by task poc/92   Call Trace:    _raw_read_lock_bh                 kernel/locking/spinlock.c:287    tipc_nl_node_set_link             net/tipc/node.c:2475    genl_family_rcv_msg_doit          net/netlink/genetlink.c:1114    genl_rcv_msg                      net/netlink/genetlink.c:1209    netlink_rcv_skb                   net/netlink/af_netlink.c:2575    Allocated by task 0:    tipc_node_create                  net/tipc/node.c:539    tipc_node_check_dest              net/tipc/node.c:1196    tipc_disc_rcv                     net/tipc/discover.c:252    Freed by task 92:    kfree                             mm/slub.c:6801    rcu_core                          kernel/rcu/tree.c:2919    Last potentially related work creation:    __call_rcu_common.constprop.0     kernel/rcu/tree.c:3181    tipc_node_timeout                 net/tipc/node.c:814  Acquire a reference to the selected node with kref_get_unless_zero() before leaving RCU, returning NULL if the node has already been released.  Release that reference on every caller exit after the last node access, including transmission in LINK_SET.  Keep the existing link lookup order and locking so concurrent link removal still takes the existing error paths.",
  "published": "2026-10-23T13:17:28Z",
  "severity": "Important",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00171,
  "epssPercentile": 0.0652,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99053",
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool6.12",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "bpftool6.12-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel-livepatch-6.12.113-138.209",
      "release": "amzn 2023",
      "fixedVersion": "1:1.0-0.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-debuginfo-common-aarch64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-debuginfo-common-x86_64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-headers",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-modules-extra",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-modules-extra-common",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-tools",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-tools-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-tools-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.113-1",
      "fix": "DEBIAN-CVE-2026-99053",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99053",
      "released": "2026-10-24T13:25:57Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.11-1",
      "fix": "DEBIAN-CVE-2026-99053",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99053",
      "released": "2026-10-24T13:25:57Z"
    },
    {
      "platform": "linux",
      "product": "perf6.12",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
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      "product": "perf6.12-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.12",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.12-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}