246 lines
15 KiB
JSON
246 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-40214",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T07:20:57.179Z",
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"datePublished": "2025-12-04T12:38:31.601Z",
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"dateUpdated": "2026-08-05T12:08:39.553Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:08:39.553Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Initialise scc_index in unix_add_edge().\n\nQuang Le reported that the AF_UNIX GC could garbage-collect a\nreceive queue of an alive in-flight socket, with a nice repro.\n\nThe repro consists of three stages.\n\n 1)\n 1-a. Create a single cyclic reference with many sockets\n 1-b. close() all sockets\n 1-c. Trigger GC\n\n 2)\n 2-a. Pass sk-A to an embryo sk-B\n 2-b. Pass sk-X to sk-X\n 2-c. Trigger GC\n\n 3)\n 3-a. accept() the embryo sk-B\n 3-b. Pass sk-B to sk-C\n 3-c. close() the in-flight sk-A\n 3-d. Trigger GC\n\nAs of 2-c, sk-A and sk-X are linked to unix_unvisited_vertices,\nand unix_walk_scc() groups them into two different SCCs:\n\n unix_sk(sk-A)->vertex->scc_index = 2 (UNIX_VERTEX_INDEX_START)\n unix_sk(sk-X)->vertex->scc_index = 3\n\nOnce GC completes, unix_graph_grouped is set to true.\nAlso, unix_graph_maybe_cyclic is set to true due to sk-X's\ncyclic self-reference, which makes close() trigger GC.\n\nAt 3-b, unix_add_edge() allocates unix_sk(sk-B)->vertex and\nlinks it to unix_unvisited_vertices.\n\nunix_update_graph() is called at 3-a. and 3-b., but neither\nunix_graph_grouped nor unix_graph_maybe_cyclic is changed\nbecause both sk-B's listener and sk-C are not in-flight.\n\n3-c decrements sk-A's file refcnt to 1.\n\nSince unix_graph_grouped is true at 3-d, unix_walk_scc_fast()\nis finally called and iterates 3 sockets sk-A, sk-B, and sk-X:\n\n sk-A -> sk-B (-> sk-C)\n sk-X -> sk-X\n\nThis is totally fine. All of them are not yet close()d and\nshould be grouped into different SCCs.\n\nHowever, unix_vertex_dead() misjudges that sk-A and sk-B are\nin the same SCC and sk-A is dead.\n\n unix_sk(sk-A)->scc_index == unix_sk(sk-B)->scc_index <-- Wrong!\n &&\n sk-A's file refcnt == unix_sk(sk-A)->vertex->out_degree\n ^-- 1 in-flight count for sk-B\n -> sk-A is dead !?\n\nThe problem is that unix_add_edge() does not initialise scc_index.\n\nStage 1) is used for heap spraying, making a newly allocated\nvertex have vertex->scc_index == 2 (UNIX_VERTEX_INDEX_START)\nset by unix_walk_scc() at 1-c.\n\nLet's track the max SCC index from the previous unix_walk_scc()\ncall and assign the max + 1 to a new vertex's scc_index.\n\nThis way, we can continue to avoid Tarjan's algorithm while\npreventing misjudgments."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The entire attack is driven by local syscalls on AF_UNIX sockets — socketpair/connect/accept, sendmsg with SCM_RIGHTS, close — which is a purely local IPC interface with no remote or adjacent-network reachability.\nAC:L - The attacker controls every stage: the spray allocates and frees the exact same `struct unix_vertex` slab objects that `unix_prepare_fpl()` then reallocates from a LIFO freelist with `scc_index` already set to UNIX_VERTEX_INDEX_START, and the self-referencing socket makes every close() deterministically trigger GC, so no condition lies outside the attacker's control.\nPR:L - Only an ordinary unprivileged local account is needed — AF_UNIX socket creation and SCM_RIGHTS fd passing require no capability, no user namespace, and no configuration, and the path is fully reachable from inside containers, sandboxes, and Android app processes.\nUI:N - The attacker's own process performs all of the socket creation, fd passing, accept(), and close() operations; no action by any other user or victim process is required.\nS:U - The prematurely freed skbs, the dangling `u->oob_skb`, and the vulnerable GC code all live in the kernel's own security authority, so this is standard local kernel privilege escalation with no boundary crossing.\nC:H - `unix_stream_recv_urg()` passes the dangling `u->oob_skb` to `recv_actor()`, copying data from a freed-and-reclaimed skb to userspace, and also reads `oob_skb->prev`; with the freed object groomed to hold a controlled `->data`/`->len`, this yields arbitrary kernel memory disclosure.\nI:H - The same path writes through freed memory — `UNIXCB(oob_skb).consumed += 1` and `__skb_unlink()` performing `prev->next = next; next->prev = prev` with attacker-groomed pointers — giving a use-after-free unlink write primitive suitable for control-flow hijack, on top of silently destroying a live socket's queued messages.\nA:H - Freeing an alive socket's receive queue leaves `u->oob_skb` and `u->inq_len` inconsistent with a purged queue; subsequent operations dereference freed skbs, reliably producing KASAN splats, oopses, and kernel panics."
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}
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]
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}
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"url": "https://mohandacherir.github.io/Qdiv7/posts/unix_new_gc/"
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}
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],
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"title": "af_unix: Initialise scc_index in unix_add_edge().",
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"dateUpdated": "2026-06-02T12:59:56.598Z"
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} |