{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-38544", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-18T19:36:34.919Z", "datePublished": "2024-06-19T13:35:18.676Z", "dateUpdated": "2026-08-05T11:32:41.788Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:32:41.788Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix seg fault in rxe_comp_queue_pkt\n\nIn rxe_comp_queue_pkt() an incoming response packet skb is enqueued to the\nresp_pkts queue and then a decision is made whether to run the completer\ntask inline or schedule it. Finally the skb is dereferenced to bump a 'hw'\nperformance counter. This is wrong because if the completer task is\nalready running in a separate thread it may have already processed the skb\nand freed it which can cause a seg fault. This has been observed\ninfrequently in testing at high scale.\n\nThis patch fixes this by changing the order of enqueuing the packet until\nafter the counter is accessed." } ], "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 vulnerable function is reached directly from the Soft-RoCE UDP encapsulation receive handler on port 4791 (rxe_udp_encap_recv → rxe_rcv → rxe_rcv_pkt → rxe_comp_queue_pkt), processing data from a remote peer. RoCEv2 is routable IP/UDP traffic, so the attacker is not confined to the local L2 segment.\nAC:L - The attacker controls both sides of the race: the vulnerable counter access only occurs when resp_pkts already holds another packet (queue_len > 1), a condition created by bursting response packets while the completer work item concurrently drains and kfree_skb()s them on another CPU. The commit describes it triggering under high packet load, which is exactly what an attacker-driven flood produces.\nPR:N - RoCEv2 provides no authentication; the only checks before the UAF are QPN lookup, QP state, source/destination IP matching the QP's address vector, default pkey, and a plain CRC32 ICRC that any attacker can compute. A malicious or compromised RDMA peer, or an attacker spoofing the peer's source address, needs no credentials on the target system.\nUI:N - Exploitation requires only that the target have an active RC/UC queue pair in RTS state, which is the normal steady-state operating condition of an RDMA connection. No action by any local user or administrator is needed at attack time.\nS:U - The use-after-free corrupts kernel slab memory and is exploited within the kernel's own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed skb's control block is read after kfree_skb(), so the attacker can groom the reallocated slab object to source the rxe pointer, and a use-after-free on the skb slab is a classic primitive for leaking adjacent kernel memory and defeating KASLR.\nI:H - The stale pointer read from the freed object is immediately passed to rxe_counter_inc(), which performs atomic64_inc(&rxe->stats_counters[index]) — a write through an attacker-influenceable pointer, giving a targeted 64-bit increment primitive that can corrupt arbitrary kernel structures and be escalated to control-flow hijack.\nA:H - The commit explicitly reports a segmentation fault (kernel oops) from this dereference, and any unresolved use-after-free of an skb reliably crashes or panics the kernel, which a remote attacker can trigger repeatedly." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/sw/rxe/rxe_comp.c" ], "versions": [ { "version": "0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0", "lessThan": "c91fb72a2ca6480d8d77262eef52dc5b178463a3", "status": "affected", "versionType": "git" }, { "version": "0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0", "lessThan": "de5a059e36657442b5637cc16df5163e435b9cb4", "status": "affected", "versionType": "git" }, { "version": "0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0", "lessThan": "e0e14dd35d4242340c7346aac60c7ff8fbf87ffc", "status": "affected", "versionType": "git" }, { "version": "0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0", "lessThan": "faa8d0ecf6c9c7c2ace3ca3e552180ada6f75e19", "status": "affected", "versionType": "git" }, { "version": "0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0", "lessThan": "21b4c6d4d89030fd4657a8e7c8110fd941049794", "status": "affected", "versionType": "git" }, { "version": "0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0", "lessThan": "bbad88f111a1829f366c189aa48e7e58e57553fc", "status": "affected", "versionType": "git" }, { "version": "0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0", "lessThan": "30df4bef8b8e183333e9b6e9d4509d552c7da6eb", "status": "affected", "versionType": "git" }, { "version": "0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0", "lessThan": "2b23b6097303ed0ba5f4bc036a1c07b6027af5c6", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/sw/rxe/rxe_comp.c" ], "versions": [ { "version": "4.12", "status": "affected" }, { "version": "0", "lessThan": "4.12", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.285", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.227", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.168", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.93", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.33", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.12", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.3", "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": "4.12", "versionEndExcluding": "5.4.285" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": 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"https://git.kernel.org/stable/c/c91fb72a2ca6480d8d77262eef52dc5b178463a3" }, { "url": "https://git.kernel.org/stable/c/de5a059e36657442b5637cc16df5163e435b9cb4" }, { "url": "https://git.kernel.org/stable/c/e0e14dd35d4242340c7346aac60c7ff8fbf87ffc" }, { "url": "https://git.kernel.org/stable/c/faa8d0ecf6c9c7c2ace3ca3e552180ada6f75e19" }, { "url": "https://git.kernel.org/stable/c/21b4c6d4d89030fd4657a8e7c8110fd941049794" }, { "url": "https://git.kernel.org/stable/c/bbad88f111a1829f366c189aa48e7e58e57553fc" }, { "url": "https://git.kernel.org/stable/c/30df4bef8b8e183333e9b6e9d4509d552c7da6eb" }, { "url": "https://git.kernel.org/stable/c/2b23b6097303ed0ba5f4bc036a1c07b6027af5c6" } ], "title": "RDMA/rxe: Fix seg fault in rxe_comp_queue_pkt", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "lang": "en", "description": "CWE-noinfo Not enough information" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": 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"https://git.kernel.org/stable/c/21b4c6d4d89030fd4657a8e7c8110fd941049794", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/bbad88f111a1829f366c189aa48e7e58e57553fc", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/30df4bef8b8e183333e9b6e9d4509d552c7da6eb", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/2b23b6097303ed0ba5f4bc036a1c07b6027af5c6", "tags": [ "x_transferred" ] }, { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:38:08.626Z" } } ] } }