CVE-2026-99246 (GCVE-0-2026-99246)

Vulnerability from cvelistv5 – Published: 2026-11-03 11:18 – Updated: 2026-11-03 19:14
VLAI
Title
tipc: protect node reset trace dump with node lock
Summary
In the Linux kernel, the following vulnerability has been resolved: tipc: protect node reset trace dump with node lock The tipc_node_reset_links trace event asks tipc_node_dump() to walk the node's link entries. Unlike the other node events that request link data, this event runs without the node lock. This permits bearer teardown to free a link while the trace callback is dumping it: CPU 0 CPU 1 trace_tipc_node_reset_links() tipc_node_dump() l = n->links[0].link tipc_node_write_lock() kfree(l) n->links[0].link = NULL tipc_node_write_unlock() tipc_link_dump(l) tipc_link_dump() then dereferences the stale pointer. KASAN reported: BUG: KASAN: slab-use-after-free in tipc_link_dump Read of size 4 by task poc/115 Call Trace: tipc_link_dump+0x10cb/0x16b0 tipc_node_dump+0x4bb/0x740 trace_event_raw_event_tipc_node_class+0x258/0x360 tipc_node_reset_links+0x14d/0x1a0 tipc_rcv+0x13f5/0x3030 tipc_udp_recv+0x4e3/0x670 Allocated by task 0: tipc_link_create+0x1e1/0x1020 tipc_node_check_dest+0x7d2/0x11a0 tipc_disc_rcv+0xdbf/0x1430 Freed by task 89: kfree+0x131/0x3c0 tipc_node_link_down+0x267/0x4b0 tipc_node_delete_links+0xec/0x160 bearer_disable+0x107/0x260 Take the node write lock around the trace event. This serializes the dump against tipc_node_link_down(delete=true), which frees the link under the same write lock.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: eb18a510b5cd4daeb9736ad8db57a9fc49db185b , < c8b72ca0918e95f708f67c8b3e69b05290f2b6d2 (git)
Affected: eb18a510b5cd4daeb9736ad8db57a9fc49db185b , < 6e492cb98ca69cc1145175e23e22e3b84da7f26d (git)
Affected: eb18a510b5cd4daeb9736ad8db57a9fc49db185b , < 7bb6a35bd6d69019539d8782fb590fd2aa8a3236 (git)
Affected: eb18a510b5cd4daeb9736ad8db57a9fc49db185b , < 6abd93d01b0f495f29201925a5ee8e6a583c4044 (git)
Affected: eb18a510b5cd4daeb9736ad8db57a9fc49db185b , < a6101d62ccfa153db8c218ce59362b8e0316fd4f (git)
Affected: eb18a510b5cd4daeb9736ad8db57a9fc49db185b , < b8b7d28dc2b7472ffd1eff3954c38f1976b21a7b (git)
Affected: eb18a510b5cd4daeb9736ad8db57a9fc49db185b , < fa8c78c0e49aa11fae116fd841e41aa8f2d68751 (git)
Affected: eb18a510b5cd4daeb9736ad8db57a9fc49db185b , < dddf197f29ba5e47a476dde82bf542ca2e0d5e5e (git)
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Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.161 , ≤ 6.6.* (semver)
Unaffected: 6.12.115 , ≤ 6.12.* (semver)
Unaffected: 6.18.59 , ≤ 6.18.* (semver)
Unaffected: 7.2.13 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: protect node reset trace dump with node lock\n\nThe tipc_node_reset_links trace event asks tipc_node_dump() to walk the\nnode\u0027s link entries. Unlike the other node events that request link data,\nthis event runs without the node lock.\n\nThis permits bearer teardown to free a link while the trace callback is\ndumping it:\n\n  CPU 0                                CPU 1\n  trace_tipc_node_reset_links()\n    tipc_node_dump()\n      l = n-\u003elinks[0].link\n                                       tipc_node_write_lock()\n                                       kfree(l)\n                                       n-\u003elinks[0].link = NULL\n                                       tipc_node_write_unlock()\n      tipc_link_dump(l)\n\ntipc_link_dump() then dereferences the stale pointer. KASAN reported:\n\n  BUG: KASAN: slab-use-after-free in tipc_link_dump\n  Read of size 4 by task poc/115\n  Call Trace:\n   tipc_link_dump+0x10cb/0x16b0\n   tipc_node_dump+0x4bb/0x740\n   trace_event_raw_event_tipc_node_class+0x258/0x360\n   tipc_node_reset_links+0x14d/0x1a0\n   tipc_rcv+0x13f5/0x3030\n   tipc_udp_recv+0x4e3/0x670\n  Allocated by task 0:\n   tipc_link_create+0x1e1/0x1020\n   tipc_node_check_dest+0x7d2/0x11a0\n   tipc_disc_rcv+0xdbf/0x1430\n  Freed by task 89:\n   kfree+0x131/0x3c0\n   tipc_node_link_down+0x267/0x4b0\n   tipc_node_delete_links+0xec/0x160\n   bearer_disable+0x107/0x260\n\nTake the node write lock around the trace event. This serializes the\ndump against tipc_node_link_down(delete=true), which frees the link\nunder the same write lock."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - A TIPC-over-UDP datagram (default port 6118) is received by tipc_udp_recv() and handed to tipc_rcv(); a non-sequential broadcast skb takes tipc_node_bc_rcv() and a LINK_PROTOCOL skb takes tipc_node_bc_sync_rcv(), both calling tipc_node_reset_links() on TIPC_LINK_DOWN_EVT. CONFIG_TIPC_MEDIA_UDP defaults to y, so the trigger is a routable IP packet.\nAC:H - The UAF is the lockless trace_tipc_node_reset_links() dump in tipc_node_reset_links() racing kfree of n-\u003elinks[].link in tipc_node_link_down(delete=true). That delete=true path is only tipc_node_delete_links() from bearer_disable()/tipc_reset_bearer(), which a remote UDP peer cannot invoke, and the dump runs only if the tipc_node_reset_links tracepoint is already enabled.\nPR:N - tipc_disc_rcv() accepts LINK_CONFIG discovery from any UDP source whose net_id matches (default 4711) with no credentials; TIPC_CRYPTO keys are optional. After tipc_node_check_dest() creates the node/link, that same unauthenticated peer\u2019s broadcast or LINK_PROTOCOL packets reach tipc_node_reset_links().\nUI:N - Once a TIPC UDP bearer is already enabled, tipc_udp_recv() processes the attacker\u2019s packets in softirq; no victim mount, click, or other interactive step is required at exploit time.\nS:U - The use-after-free is of a host-kernel tipc_link object inside tipc_node_dump()/tipc_link_dump(); impact stays in the same kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - KASAN reported a 4-byte read of a freed tipc_link in tipc_link_dump() from the stale n-\u003elinks[0].link loaded by tipc_node_dump(); reclaiming that kmalloc object lets the dump read leftover or attacker-sprayed heap, including skb_peek() of transmq/deferdq heads.\nI:H - After bearer_disable() kfree()s the tipc_link, the stale pointer in tipc_node_dump() is a slab UAF: spraying a replacement object lets tipc_link_dump() follow attacker-chosen list pointers via skb_peek(), which is an exploitable kernel write/control-flow primitive.\nA:H - tipc_link_dump() dereference of the freed tipc_link oopses the kernel, matching the reported KASAN slab-use-after-free in the tipc_rcv() path; each overlapping packet and bearer teardown can repeat the crash."
            }
          ]
        }
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      "providerMetadata": {
        "dateUpdated": "2026-11-03T19:14:37.365Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c8b72ca0918e95f708f67c8b3e69b05290f2b6d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e492cb98ca69cc1145175e23e22e3b84da7f26d"
        },
        {
          "url": "https://git.kernel.org/stable/c/7bb6a35bd6d69019539d8782fb590fd2aa8a3236"
        },
        {
          "url": "https://git.kernel.org/stable/c/6abd93d01b0f495f29201925a5ee8e6a583c4044"
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        },
        {
          "url": "https://git.kernel.org/stable/c/dddf197f29ba5e47a476dde82bf542ca2e0d5e5e"
        }
      ],
      "title": "tipc: protect node reset trace dump with node lock",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99246",
    "datePublished": "2026-11-03T11:18:25.838Z",
    "dateReserved": "2026-09-25T10:25:14.403Z",
    "dateUpdated": "2026-11-03T19:14:37.365Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-99246",
      "date": "2026-11-04",
      "epss": "0.00443",
      "percentile": "0.38631"
    },
    "nvd": {
      "cve": {
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                    "versionType": "semver"
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                    "versionType": "semver"
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                    "version": "7.3",
                    "versionType": "original_commit_for_fix"
                  }
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              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: protect node reset trace dump with node lock\n\nThe tipc_node_reset_links trace event asks tipc_node_dump() to walk the\nnode\u0027s link entries. Unlike the other node events that request link data,\nthis event runs without the node lock.\n\nThis permits bearer teardown to free a link while the trace callback is\ndumping it:\n\n  CPU 0                                CPU 1\n  trace_tipc_node_reset_links()\n    tipc_node_dump()\n      l = n-\u003elinks[0].link\n                                       tipc_node_write_lock()\n                                       kfree(l)\n                                       n-\u003elinks[0].link = NULL\n                                       tipc_node_write_unlock()\n      tipc_link_dump(l)\n\ntipc_link_dump() then dereferences the stale pointer. KASAN reported:\n\n  BUG: KASAN: slab-use-after-free in tipc_link_dump\n  Read of size 4 by task poc/115\n  Call Trace:\n   tipc_link_dump+0x10cb/0x16b0\n   tipc_node_dump+0x4bb/0x740\n   trace_event_raw_event_tipc_node_class+0x258/0x360\n   tipc_node_reset_links+0x14d/0x1a0\n   tipc_rcv+0x13f5/0x3030\n   tipc_udp_recv+0x4e3/0x670\n  Allocated by task 0:\n   tipc_link_create+0x1e1/0x1020\n   tipc_node_check_dest+0x7d2/0x11a0\n   tipc_disc_rcv+0xdbf/0x1430\n  Freed by task 89:\n   kfree+0x131/0x3c0\n   tipc_node_link_down+0x267/0x4b0\n   tipc_node_delete_links+0xec/0x160\n   bearer_disable+0x107/0x260\n\nTake the node write lock around the trace event. This serializes the\ndump against tipc_node_link_down(delete=true), which frees the link\nunder the same write lock."
          }
        ],
        "id": "CVE-2026-99246",
        "lastModified": "2026-11-03T20:18:31.013",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.2,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-11-03T12:17:31.030",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6abd93d01b0f495f29201925a5ee8e6a583c4044"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6e492cb98ca69cc1145175e23e22e3b84da7f26d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7bb6a35bd6d69019539d8782fb590fd2aa8a3236"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a6101d62ccfa153db8c218ce59362b8e0316fd4f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b8b7d28dc2b7472ffd1eff3954c38f1976b21a7b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c8b72ca0918e95f708f67c8b3e69b05290f2b6d2"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/dddf197f29ba5e47a476dde82bf542ca2e0d5e5e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fa8c78c0e49aa11fae116fd841e41aa8f2d68751"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-11-04T19:06:48+00:00",
      "cve": "CVE-2026-99246",
      "id": "CVE-2026-99246",
      "initial_release_date": "2026-11-03T11:18:25.838000+00:00",
      "product_status:known_affected": "162",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kernel: Arbitrary code execution via use-after-free in TIPC subsystem",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99246.json",
      "version": "3"
    }
  }
}



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