305 lines
17 KiB
JSON
305 lines
17 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-2024-40983",
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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": "2024-07-12T12:17:45.604Z",
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"datePublished": "2024-07-12T12:33:57.263Z",
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"dateUpdated": "2026-08-05T11:34:23.838Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:34:23.838Z"
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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\ntipc: force a dst refcount before doing decryption\n\nAs it says in commit 3bc07321ccc2 (\"xfrm: Force a dst refcount before\nentering the xfrm type handlers\"):\n\n\"Crypto requests might return asynchronous. In this case we leave the\n rcu protected region, so force a refcount on the skb's destination\n entry before we enter the xfrm type input/output handlers.\"\n\nOn TIPC decryption path it has the same problem, and skb_dst_force()\nshould be called before doing decryption to avoid a possible crash.\n\nShuang reported this issue when this warning is triggered:\n\n [] WARNING: include/net/dst.h:337 tipc_sk_rcv+0x1055/0x1ea0 [tipc]\n [] Kdump: loaded Tainted: G W --------- - - 4.18.0-496.el8.x86_64+debug\n [] Workqueue: crypto cryptd_queue_worker\n [] RIP: 0010:tipc_sk_rcv+0x1055/0x1ea0 [tipc]\n [] Call Trace:\n [] tipc_sk_mcast_rcv+0x548/0xea0 [tipc]\n [] tipc_rcv+0xcf5/0x1060 [tipc]\n [] tipc_aead_decrypt_done+0x215/0x2e0 [tipc]\n [] cryptd_aead_crypt+0xdb/0x190\n [] cryptd_queue_worker+0xed/0x190\n [] process_one_work+0x93d/0x17e0"
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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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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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:N - The bug only manifests on the TIPC UDP bearer path (`tipc_udp_recv()` → `tipc_rcv()`, default UDP port 6118), where the skb still carries the noref input-route dst set by `ip_route_input_noref()`; L2 bearers carry no dst at all, so the affected configuration is precisely the routable, remotely reachable one, reachable from any host that can send UDP to the node.\nAC:L - Once TIPC crypto is keyed, every asynchronously completed decryption reaches `__sk_add_backlog()`/`__sock_queue_rcv_skb()` → `skb_dst_force()` from a `cryptd_queue_worker` context outside RCU, tripping `WARN_ON(!rcu_read_lock_held())` deterministically, and the attacker can force the async path at will since `aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG, ...)` makes a packet flood push requests into the crypto backlog (-EBUSY/-EINPROGRESS), while hardware AEAD offload (QAT/CAAM/CCP) makes it async unconditionally. `CONFIG_TIPC_CRYPTO` is `default y`, so no rare build option is involved, and the attacker can also churn the input-route cache with spoofed sources to widen the window in which the noref dst is actually RCU-freed.\nPR:N - The attacker needs no account, capability, or any privilege on the target host — the path is entered purely by sending TIPC packets to the bearer socket; in TIPC cluster/master-key mode the AEAD key is a single network-wide shared secret held identically by every node, so any peer or compromised cluster member (and an on-path injector replaying an in-flight encrypted frame) reaches the vulnerable code with zero authorization from the vulnerable component.\nUI:N - Delivery of network packets to a configured TIPC bearer is processed entirely by the kernel with no action by any local user or administrator.\nS:U - The stale dst reference, the WARN and any resulting corruption are confined to kernel memory within the same security authority; no VM, IOMMU, container or sandbox boundary is crossed.\nC:H - After the crypto callback leaves the RCU read-side section, `skb_dst_force()` calls `dst_hold_safe()` on a `struct rtable` that may already have been released by `dst_destroy_rcu()`, reading freed slab memory; worse, the skb then loses `SKB_DST_NOREF` and holds what the stack treats as a refcounted pointer into reallocated memory, whose later dereference (`dst->ops`, `dst->dev`) can expose contents of an attacker-groomed object — a use-after-free of this class is treated as High.\nI:H - `dst_hold_safe()` performs a read-modify-write (`rcuref_get`/`atomic_inc_not_zero`) on freed memory, and the subsequent `dst_release()` decrements the same location, giving an attacker who sprays the freed `rtable` slab an increment/decrement primitive plus a premature-free trigger on an unrelated object, including control over the `dst->ops` function-pointer table used on release.\nA:H - The missing refcount reliably trips `WARN_ON(!rcu_read_lock_held())` in `skb_dst_force()` (fatal on the common `panic_on_warn=1` hardened/cloud deployments), and the commit itself states the intent is \"to avoid a possible crash\" — a use-after-free of the dst entry oopses the kernel, and the condition is repeatable on demand by continued packet transmission."
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}
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"product": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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