{"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":"5.10.227"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"5.15.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"6.1.93"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"6.6.33"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"6.8.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"6.9.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"6.10"}]}]}],"references":[{"url":"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: 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