{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-53398","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-09-17T14:54:09.738Z","datePublished":"2025-09-18T13:33:38.842Z","dateUpdated":"2026-08-05T09:13:53.982Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T09:13:53.982Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmlx5: fix possible ptp queue fifo use-after-free\n\nFifo indexes are not checked during pop operations and it leads to\npotential use-after-free when poping from empty queue. Such case was\npossible during re-sync action. WARN_ON_ONCE covers future cases.\n\nThere were out-of-order cqe spotted which lead to drain of the queue and\nuse-after-free because of lack of fifo pointers check. Special check and\ncounter are added to avoid resync operation if SKB could not exist in the\nfifo because of OOO cqe (skb_id must be between consumer and producer\nindex)."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The UAF is in the mlx5 PTP TX port-timestamp completion path (NAPI → mlx5e_ptp_handle_ts_cqe → fifo pop), reached only by locally originated skbs with SKBTX_HW_TSTAMP classified as PTP (UDP/319 or ethertype 0x88F7). A remote peer cannot set those TX flags or inject the DMA'd CQEs the handler consumes.\nAC:L - An unprivileged local attacker fully controls the traffic that fills the PTP skb fifo and can burst PTP TX to provoke lost/out-of-order wire CQEs and the subsequent empty-fifo resync drain; the enabling tx_port_ts setting is routine in PTP deployments, not a rare config beyond attacker influence.\nPR:L - setsockopt(SO_TIMESTAMPING) with SOF_TIMESTAMPING_TX_HARDWARE and sending UDP to port 319 need no capabilities, and mlx5e_use_ptpsq() gates only on skb tx_flags and packet type—so any unprivileged local user can drive the vulnerable path once the interface is in normal PTP TX-port-TS configuration.\nUI:N - The attacker’s own packet transmissions and the resulting TS-CQE/NAPI processing trigger the empty-fifo pop and UAF with no action required from another user or administrator.\nS:U - Impact is confined to kernel heap objects (sk_buffs and the driver’s skb fifo) in the same kernel security authority, with no VM, IOMMU, or sandbox boundary crossed.\nC:H - Popping an empty/stale fifo slot yields a use-after-free of sk_buff: mlx5e_skb_cb_get_hwts()/skb_tstamp_tx() read and clone freed slab memory onto a socket error queue, enabling heap disclosure via spraying.\nI:H - The same UAF leads to napi_consume_skb() on a freed (or reallocated) sk_buff, causing double-free/refcount underflow and writes into freed skb->cb via mlx5e_skb_cb_hwtstamp_handler—heap corruption primitives suitable for control-flow hijack.\nA:H - Empty-fifo pops dereference NULL/stale pointers and double-free sk_buffs in softirq/NAPI context, producing kernel oopses/BUGs (and WARN_ON_ONCE under panic_on_warn) that take down the host."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c","drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h","drivers/net/ethernet/mellanox/mlx5/core/en_stats.c","drivers/net/ethernet/mellanox/mlx5/core/en_stats.h"],"versions":[{"version":"58a518948f60153e8f6cb8361d2712aa3a1af94a","lessThan":"52e6e7a0bc04c85012a9251c7cf2d444a77eb966","status":"affected","versionType":"git"},{"version":"58a518948f60153e8f6cb8361d2712aa3a1af94a","lessThan":"6afdedc4e66e3846ce497744f01b95c34bf39d21","status":"affected","versionType":"git"},{"version":"58a518948f60153e8f6cb8361d2712aa3a1af94a","lessThan":"3a50cf1e8e5157b82268eee7e330dbe5736a0948","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/net/ethernet/mellanox/mlx5/core/en/ptp.c","drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h","drivers/net/ethernet/mellanox/mlx5/core/en_stats.c","drivers/net/ethernet/mellanox/mlx5/core/en_stats.h"],"versions":[{"version":"6.0","status":"affected"},{"version":"0","lessThan":"6.0","status":"unaffected","versionType":"semver"},{"version":"6.1.18","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.2.5","lessThanOrEqual":"6.2.*","status":"unaffected","versionType":"semver"},{"version":"6.3","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":"6.0","versionEndExcluding":"6.1.18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.2.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.3"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/52e6e7a0bc04c85012a9251c7cf2d444a77eb966"},{"url":"https://git.kernel.org/stable/c/6afdedc4e66e3846ce497744f01b95c34bf39d21"},{"url":"https://git.kernel.org/stable/c/3a50cf1e8e5157b82268eee7e330dbe5736a0948"}],"title":"mlx5: fix possible ptp queue fifo use-after-free","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.8,"attackVector":"LOCAL","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"id":"CVE-2023-53398","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-01-14T19:00:48.835326Z"}}}],"problemTypes":[{"descriptions":[{"lang":"en","type":"CWE","cweId":"CWE-416","description":"CWE-416 Use After Free"}]}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-01-14T19:03:06.499Z"}}]}}