{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-40983", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-07-12T12:17:45.604Z", "datePublished": "2024-07-12T12:33:57.263Z", "dateUpdated": "2026-08-05T11:34:23.838Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:34:23.838Z" }, "descriptions": [ { "lang": "en", "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" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "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." } ] } ], "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": "fc1b6d6de2208774efd2a20bf0daddb02d18b1e0", "lessThan": "3eb1b39627892c4e26cb0162b75725aa5fcc60c8", "status": "affected", "versionType": "git" }, { "version": "fc1b6d6de2208774efd2a20bf0daddb02d18b1e0", "lessThan": "692803b39a36e63ac73208e0a3769ae6a2f9bc76", "status": "affected", "versionType": "git" }, { "version": "fc1b6d6de2208774efd2a20bf0daddb02d18b1e0", "lessThan": "623c90d86a61e3780f682b32928af469c66ec4c2", "status": "affected", "versionType": "git" }, { "version": "fc1b6d6de2208774efd2a20bf0daddb02d18b1e0", "lessThan": "b57a4a2dc8746cea58a922ebe31b6aa629d69d93", "status": "affected", "versionType": "git" }, { "version": "fc1b6d6de2208774efd2a20bf0daddb02d18b1e0", "lessThan": "6808b41371670c51feea14f63ade211e78100930", "status": "affected", "versionType": "git" }, { "version": "fc1b6d6de2208774efd2a20bf0daddb02d18b1e0", "lessThan": "2ebe8f840c7450ecbfca9d18ac92e9ce9155e269", "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": "5.5", "status": "affected" }, { "version": "0", "lessThan": "5.5", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.221", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.162", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.96", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.36", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.7", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10", "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": "5.5", "versionEndExcluding": "5.10.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.15.162" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.1.96" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.6.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.9.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/3eb1b39627892c4e26cb0162b75725aa5fcc60c8" }, { "url": "https://git.kernel.org/stable/c/692803b39a36e63ac73208e0a3769ae6a2f9bc76" }, { "url": "https://git.kernel.org/stable/c/623c90d86a61e3780f682b32928af469c66ec4c2" }, { "url": "https://git.kernel.org/stable/c/b57a4a2dc8746cea58a922ebe31b6aa629d69d93" }, { "url": "https://git.kernel.org/stable/c/6808b41371670c51feea14f63ade211e78100930" }, { "url": "https://git.kernel.org/stable/c/2ebe8f840c7450ecbfca9d18ac92e9ce9155e269" } ], "title": "tipc: force a dst 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"shortName": "CVE", "dateUpdated": "2025-11-03T21:58:47.921Z" } }, { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-40983", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T17:02:13.493957Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:34:21.167Z" } } ] } }