{"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"}}}}