{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-99246", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.403Z", "datePublished": "2026-11-03T11:18:25.838Z", "dateUpdated": "2026-11-03T19:14:37.365Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-11-03T19:14:37.365Z" }, "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's 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->links[0].link\n tipc_node_write_lock()\n kfree(l)\n n->links[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": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH" }, "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->links[].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’s 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’s 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->links[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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/tipc/node.c" ], "versions": [ { "version": "eb18a510b5cd4daeb9736ad8db57a9fc49db185b", "lessThan": "c8b72ca0918e95f708f67c8b3e69b05290f2b6d2", "status": "affected", "versionType": "git" }, { "version": "eb18a510b5cd4daeb9736ad8db57a9fc49db185b", "lessThan": "6e492cb98ca69cc1145175e23e22e3b84da7f26d", "status": "affected", "versionType": "git" }, { "version": "eb18a510b5cd4daeb9736ad8db57a9fc49db185b", "lessThan": "7bb6a35bd6d69019539d8782fb590fd2aa8a3236", "status": "affected", "versionType": "git" }, { "version": "eb18a510b5cd4daeb9736ad8db57a9fc49db185b", "lessThan": "6abd93d01b0f495f29201925a5ee8e6a583c4044", "status": "affected", "versionType": "git" }, { "version": "eb18a510b5cd4daeb9736ad8db57a9fc49db185b", "lessThan": "a6101d62ccfa153db8c218ce59362b8e0316fd4f", "status": "affected", "versionType": "git" }, { "version": "eb18a510b5cd4daeb9736ad8db57a9fc49db185b", "lessThan": "b8b7d28dc2b7472ffd1eff3954c38f1976b21a7b", "status": "affected", "versionType": "git" }, { "version": "eb18a510b5cd4daeb9736ad8db57a9fc49db185b", "lessThan": "fa8c78c0e49aa11fae116fd841e41aa8f2d68751", "status": "affected", "versionType": "git" }, { "version": "eb18a510b5cd4daeb9736ad8db57a9fc49db185b", "lessThan": "dddf197f29ba5e47a476dde82bf542ca2e0d5e5e", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/tipc/node.c" ], "versions": [ { "version": "5.0", "status": "affected" }, { "version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.161", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.115", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.59", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.13", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.10.273" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.15.224" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.1.191" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.6.161" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.12.115" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.18.59" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.2.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.3" } ] } ] } ], "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" }, { "url": "https://git.kernel.org/stable/c/a6101d62ccfa153db8c218ce59362b8e0316fd4f" }, { "url": "https://git.kernel.org/stable/c/b8b7d28dc2b7472ffd1eff3954c38f1976b21a7b" }, { "url": "https://git.kernel.org/stable/c/fa8c78c0e49aa11fae116fd841e41aa8f2d68751" }, { "url": "https://git.kernel.org/stable/c/dddf197f29ba5e47a476dde82bf542ca2e0d5e5e" } ], "title": "tipc: protect node reset trace dump with node lock", "x_generator": { "engine": "bippy-1.2.0" } } } }