CVE-2026-99053 (GCVE-0-2026-99053)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:22 – Updated: 2026-10-30 12:41
VLAI
Title
tipc: hold a reference to nodes found by link name
Summary
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's 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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/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: 6a939f365bdb03a74b4617bdb4402fc08da088b9 , < 384edc67201f8561b7de952647b923f0524b1f36 (git)
Affected: 6a939f365bdb03a74b4617bdb4402fc08da088b9 , < 5b7e58e8be90f4e8530e7a60372d003dfa7fd666 (git)
Affected: 6a939f365bdb03a74b4617bdb4402fc08da088b9 , < 92f3b3368722631e933a4db0cf8bd578ed08cd9c (git)
Affected: 6a939f365bdb03a74b4617bdb4402fc08da088b9 , < b60259d4047fbb735476c729dcf9306a038b6110 (git)
Affected: 6a939f365bdb03a74b4617bdb4402fc08da088b9 , < f17e70206a1e763fcca2578a8db3c4eed0f843a9 (git)
Affected: 6a939f365bdb03a74b4617bdb4402fc08da088b9 , < 1428c5f1d346a2e1ac9156713975a72246957009 (git)
Affected: 6a939f365bdb03a74b4617bdb4402fc08da088b9 , < 3c3b308ee6e25729a6cf09b69cdd0e093220d40b (git)
Affected: 6a939f365bdb03a74b4617bdb4402fc08da088b9 , < 17e73bae400f6a434dc006e3bee92c94cf781954 (git)
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Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.57 , ≤ 6.18.* (semver)
Unaffected: 7.2.11 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: hold a reference to nodes found by link name\n\ntipc_node_find_by_name() returns a node after dropping its RCU read lock\nwithout taking a reference.  The LINK_SET, LINK_GET and LINK_RESET_STATS\nhandlers then lock and access the node, racing with timer-driven cleanup of\na down peer.  Generic netlink serialization does not exclude the node\ntimer.\n\nThe following interleaving can leave a handler using a freed node:\n\n  CPU 0: find the node under RCU and release the node read lock\n  CPU 1: tipc_node_timeout() clears the links and unlinks the down node\n  CPU 1: drop the list and timer references, queuing tipc_node_free()\n  CPU 0: leave the RCU read-side critical section\n  CPU 1: complete the grace period and free the node\n  CPU 0: acquire the node lock through the stale pointer\n\nLINK_SET also uses the node\u0027s media address after releasing the node lock,\nwhen passing queued packets to tipc_bearer_xmit().\n\nKASAN on v7.3-rc5 reported:\n\n  BUG: KASAN: slab-use-after-free in _raw_read_lock_bh\n  Write of size 4 at addr ffff88807e06f008 by task poc/92\n  Call Trace:\n   _raw_read_lock_bh                 kernel/locking/spinlock.c:287\n   tipc_nl_node_set_link             net/tipc/node.c:2475\n   genl_family_rcv_msg_doit          net/netlink/genetlink.c:1114\n   genl_rcv_msg                      net/netlink/genetlink.c:1209\n   netlink_rcv_skb                   net/netlink/af_netlink.c:2575\n\n  Allocated by task 0:\n   tipc_node_create                  net/tipc/node.c:539\n   tipc_node_check_dest              net/tipc/node.c:1196\n   tipc_disc_rcv                     net/tipc/discover.c:252\n\n  Freed by task 92:\n   kfree                             mm/slub.c:6801\n   rcu_core                          kernel/rcu/tree.c:2919\n\n  Last potentially related work creation:\n   __call_rcu_common.constprop.0     kernel/rcu/tree.c:3181\n   tipc_node_timeout                 net/tipc/node.c:814\n\nAcquire a reference to the selected node with kref_get_unless_zero() before\nleaving RCU, returning NULL if the node has already been released.  Release\nthat reference on every caller exit after the last node access, including\ntransmission in LINK_SET.  Keep the existing link lookup order and locking\nso concurrent link removal still takes the existing error paths."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The attacker-controlled selector is TIPC_NLA_LINK_NAME in a local NETLINK_GENERIC TIPC_NL_LINK_GET request, dispatched to tipc_nl_node_get_link() and patched tipc_node_find_by_name(). Remote packets can create or down the peer but cannot invoke this handler, so one remote actor cannot trigger the UAF.\nAC:L - The same local attacker can create TIPC peers in user/network namespaces, stop one so node_lost_contact() sets delete_at, and flood LINK_GET while tipc_node_timeout() performs cleanup. Both sides of this repeatable race are attacker-controlled, and the submitted PoC reached the KASAN UAF.\nPR:L - TIPC_NL_LINK_GET is registered without an administrative permission flag and reaches tipc_nl_node_get_link() for any local netlink caller. Setup mutators use GENL_UNS_ADMIN_PERM and the family has netnsok=true, allowing an unprivileged user to obtain the necessary namespace-local rights.\nUI:N - The attacker can create and stop its own TIPC peer and issue the racing TIPC_NL_LINK_GET requests without any victim action.\nS:U - The stale pointer from tipc_node_find_by_name() corrupts host-kernel tipc_node and tipc_link slab objects; no VM, IOMMU, or other security-authority boundary is crossed.\nC:H - TIPC_NL_LINK_GET follows a reclaimed node-\u003elinks[bearer_id].link into __tipc_nl_add_link(), which copies link names, properties, and statistics into the attacker\u0027s netlink reply. Heap grooming can therefore turn the stale node into an arbitrary kernel-read primitive.\nI:H - _raw_read_lock_bh() already performs the reported four-byte write to freed node-\u003elock. With a reclaimed links pointer, TIPC_NL_LINK_RESET_STATS reaches tipc_link_reset_stats(), whose memset() provides an attacker-directed kernel write suitable for further corruption or control-flow hijacking.\nA:H - The observed slab use-after-free occurs while tipc_nl_node_set_link() locks the freed node; corrupted lock state or the subsequent stale node/link dereferences can cause a kernel oops or panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:41:20.179Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/384edc67201f8561b7de952647b923f0524b1f36"
        },
        {
          "url": "https://git.kernel.org/stable/c/5b7e58e8be90f4e8530e7a60372d003dfa7fd666"
        },
        {
          "url": "https://git.kernel.org/stable/c/92f3b3368722631e933a4db0cf8bd578ed08cd9c"
        },
        {
          "url": "https://git.kernel.org/stable/c/b60259d4047fbb735476c729dcf9306a038b6110"
        },
        {
          "url": "https://git.kernel.org/stable/c/f17e70206a1e763fcca2578a8db3c4eed0f843a9"
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          "url": "https://git.kernel.org/stable/c/3c3b308ee6e25729a6cf09b69cdd0e093220d40b"
        },
        {
          "url": "https://git.kernel.org/stable/c/17e73bae400f6a434dc006e3bee92c94cf781954"
        }
      ],
      "title": "tipc: hold a reference to nodes found by link name",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99053",
    "datePublished": "2026-10-23T12:22:35.462Z",
    "dateReserved": "2026-09-25T10:25:14.388Z",
    "dateUpdated": "2026-10-30T12:41:20.179Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-99053",
      "date": "2026-11-05",
      "epss": "0.00171",
      "percentile": "0.06531"
    },
    "microsoft_vex": {
      "current_release_date": "2026-11-01T15:05:08.000Z",
      "cve": "CVE-2026-99053",
      "id": "msrc_CVE-2026-99053",
      "initial_release_date": "2026-10-25T01:04:41.000Z",
      "product_status:known_affected": "2",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "tipc: hold a reference to nodes found by link name",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-99053.json",
      "version": "4"
    },
    "nvd": {
      "cve": {
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                    "versionType": "original_commit_for_fix"
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: hold a reference to nodes found by link name\n\ntipc_node_find_by_name() returns a node after dropping its RCU read lock\nwithout taking a reference.  The LINK_SET, LINK_GET and LINK_RESET_STATS\nhandlers then lock and access the node, racing with timer-driven cleanup of\na down peer.  Generic netlink serialization does not exclude the node\ntimer.\n\nThe following interleaving can leave a handler using a freed node:\n\n  CPU 0: find the node under RCU and release the node read lock\n  CPU 1: tipc_node_timeout() clears the links and unlinks the down node\n  CPU 1: drop the list and timer references, queuing tipc_node_free()\n  CPU 0: leave the RCU read-side critical section\n  CPU 1: complete the grace period and free the node\n  CPU 0: acquire the node lock through the stale pointer\n\nLINK_SET also uses the node\u0027s media address after releasing the node lock,\nwhen passing queued packets to tipc_bearer_xmit().\n\nKASAN on v7.3-rc5 reported:\n\n  BUG: KASAN: slab-use-after-free in _raw_read_lock_bh\n  Write of size 4 at addr ffff88807e06f008 by task poc/92\n  Call Trace:\n   _raw_read_lock_bh                 kernel/locking/spinlock.c:287\n   tipc_nl_node_set_link             net/tipc/node.c:2475\n   genl_family_rcv_msg_doit          net/netlink/genetlink.c:1114\n   genl_rcv_msg                      net/netlink/genetlink.c:1209\n   netlink_rcv_skb                   net/netlink/af_netlink.c:2575\n\n  Allocated by task 0:\n   tipc_node_create                  net/tipc/node.c:539\n   tipc_node_check_dest              net/tipc/node.c:1196\n   tipc_disc_rcv                     net/tipc/discover.c:252\n\n  Freed by task 92:\n   kfree                             mm/slub.c:6801\n   rcu_core                          kernel/rcu/tree.c:2919\n\n  Last potentially related work creation:\n   __call_rcu_common.constprop.0     kernel/rcu/tree.c:3181\n   tipc_node_timeout                 net/tipc/node.c:814\n\nAcquire a reference to the selected node with kref_get_unless_zero() before\nleaving RCU, returning NULL if the node has already been released.  Release\nthat reference on every caller exit after the last node access, including\ntransmission in LINK_SET.  Keep the existing link lookup order and locking\nso concurrent link removal still takes the existing error paths."
          }
        ],
        "id": "CVE-2026-99053",
        "lastModified": "2026-10-30T13:21:41.943",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-23T13:17:28.877",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1428c5f1d346a2e1ac9156713975a72246957009"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/17e73bae400f6a434dc006e3bee92c94cf781954"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/384edc67201f8561b7de952647b923f0524b1f36"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3c3b308ee6e25729a6cf09b69cdd0e093220d40b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5b7e58e8be90f4e8530e7a60372d003dfa7fd666"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/92f3b3368722631e933a4db0cf8bd578ed08cd9c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b60259d4047fbb735476c729dcf9306a038b6110"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f17e70206a1e763fcca2578a8db3c4eed0f843a9"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T03:22:02+00:00",
      "cve": "CVE-2026-99053",
      "id": "CVE-2026-99053",
      "initial_release_date": "2026-10-23T00:00:00+00:00",
      "product_status:known_affected": "161",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tipc: hold a reference to nodes found by link name",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99053.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-11-04T16:01:36Z",
      "cve": "CVE-2026-99053",
      "id": "CVE-2026-99053",
      "initial_release_date": "2026-10-23T23:51:15Z",
      "product_status:known_affected": "205",
      "product_status:known_not_affected": "143",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-99053",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-99053.json",
      "version": "5"
    }
  }
}



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