{ "document": { "aggregate_severity": { "text": "Critical" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/amazonlinux2els/vex/2026/cve-2026-99081-els_os-amazonlinux2els.json" } ], "tracking": { "current_release_date": "2026-11-07T21:45:59Z", "generator": { "date": "2026-11-07T21:45:59Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-99081-ELS_OS-AMAZONLINUX2ELS", "initial_release_date": "2026-10-23T13:17:00Z", "revision_history": [ { "date": "2026-10-23T13:17:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-11-07T21:45:59Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security 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"vulnerabilities": [ { "cve": "CVE-2026-99081", "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nbnxt_en: fix DMA mapping length for padded small packets\n\nStefan Fleischmann reported Intel IOMMU DMA Read faults on BCM57412\nNetXtreme-E NICs when transmitting packets on VLAN/macvlan interfaces:\n\n DMAR: [DMA Read NO_PASID] Request device [18:00.0] fault addr 0xfc499000\n [fault reason 0x06] PTE Read access is not set\n bnxt_en 0000:18:00.0 eno1np0: Abandoning msg {0xb4 0x41a} len: 0 due to firmware status: 0x2000001\n ...\n NETDEV WATCHDOG: eno1np0 (bnxt_en): transmit queue 0 timed out\n\nThe fault address (0xfc499000) is on an exact 4KB page boundary,\npointing to a DMA read buffer overrun.\n\nIn bnxt_start_xmit(), packets smaller than BNXT_MIN_PKT_SIZE (52 bytes),\nsuch as 42-byte untagged ARP frames, are padded:\n\n if (length < BNXT_MIN_PKT_SIZE) {\n pad = BNXT_MIN_PKT_SIZE - length;\n if (skb_pad(skb, pad))\n goto tx_kick_pending;\n length = BNXT_MIN_PKT_SIZE;\n }\n\n mapping = dma_map_single(&pdev->dev, skb->data, len, DMA_TO_DEVICE);\n ...\n dma_unmap_len_set(tx_buf, len, len);\n\nHowever, 'len' was initialized earlier to skb_headlen(skb) (e.g. 42 bytes)\nand is left unadjusted after padding. Consequently, dma_map_single() and\ndma_unmap_len_set() map and track only 42 bytes.\n\nLater, the hardware TX buffer descriptor is programmed with the padded length:\n\n txbd->tx_bd_len_flags_type =\n cpu_to_le32(((len + pad) << TX_BD_LEN_SHIFT) | flags |\n TX_BD_FLAGS_PACKET_END);\n\nThe NIC DMA engine is thus instructed to read 52 bytes from a region where\nonly 42 bytes were DMA-mapped. If skb->data ends near the boundary of a 4KB\npage (within 'pad' bytes of the next page), the hardware DMA read overruns\ninto the unmapped adjacent page, triggering an IOMMU fault.\n\nThis issue was exposed after commit 447cbe95ebb9 (\"vlan: fix skb_under_panic\nand races when toggling HW VLAN offload\") because reserving extra VLAN\nheadroom rounded LL_RESERVED_SPACE from 48 up to 64 bytes, shifting skb->data\noffsets and potentially causing small frames to land right against page\nboundaries.\n\nFix this by using skb_put_padto(skb, BNXT_MIN_PKT_SIZE) in\nbnxt_start_xmit(), before skb_shinfo(skb)->nr_frags is sampled,\nbecause padding might linearize the skb.\nThis ensures skb->len and skb_headlen(skb) reflect the padded size so\nthat dma_map_single() maps the full buffer and the descriptor length is\nconsistent. This also removes the temporary 'pad' variable and masking logic.\n\nThe padding is done after the SW USO branch, otherwise\nbnxt_sw_udp_gso_xmit() would account the padding as UDP payload\nand send it in extra segments.\n\nNote that SW USO segments are still not padded: with IPv4, a segment\ncarrying less than 10 bytes of UDP payload (small gso_size, or a short\nlast segment) is sent as a frame shorter than BNXT_MIN_PKT_SIZE.\nThis is a separate issue, left for a followup patch.", "title": "Vulnerability description" } ], "product_status": { "fixed": [ "Amazon-Linux-2:bpftool-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-headers-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:perf-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:python-perf-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64" ], "known_affected": [ "Amazon-Linux-2:bpftool-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:bpftool-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:bpftool-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:bpftool-0:5.10.272-271.1109.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:bpftool-0:5.10.273-274.1999.amzn2.x86_64", "Amazon-Linux-2:kernel-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:kernel-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-0:5.10.272-271.1109.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:kernel-0:5.10.273-274.1999.amzn2.x86_64", 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"Amazon-Linux-2:python-perf-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:python-perf-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:python-perf-0:5.10.272-271.1109.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:python-perf-0:5.10.273-274.1999.amzn2.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-99081" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/0f347e00d060dc0bf3b2d0ee041206e54848c233", "url": "https://git.kernel.org/stable/c/0f347e00d060dc0bf3b2d0ee041206e54848c233" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/2956aca14dd2977cd08bd2ccafae3beb8b84b268", "url": "https://git.kernel.org/stable/c/2956aca14dd2977cd08bd2ccafae3beb8b84b268" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/3a5d8465e73aff3c7d1ec38261dcaaa317367467", "url": "https://git.kernel.org/stable/c/3a5d8465e73aff3c7d1ec38261dcaaa317367467" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/5213f65a9667d3dd85db2e6df8f2e0516290db34", "url": "https://git.kernel.org/stable/c/5213f65a9667d3dd85db2e6df8f2e0516290db34" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/a51d233ccd4889aadb71dace863525cc2b00271e", "url": "https://git.kernel.org/stable/c/a51d233ccd4889aadb71dace863525cc2b00271e" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/b3fd0177cf18a6ac98d41af80b4040010ea40f4d", "url": "https://git.kernel.org/stable/c/b3fd0177cf18a6ac98d41af80b4040010ea40f4d" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/cf8530a25ae92c4493e2f22981ecb46f0b66f4c8", "url": "https://git.kernel.org/stable/c/cf8530a25ae92c4493e2f22981ecb46f0b66f4c8" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/fbd977e513971ccb4f0762a7f59eac500e474f89", "url": "https://git.kernel.org/stable/c/fbd977e513971ccb4f0762a7f59eac500e474f89" } ], "release_date": "2026-10-23T13:17:00Z", "remediations": [ { "category": "vendor_fix", "date": "2026-11-05T12:53:42.499096Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1793883221", "product_ids": [ "Amazon-Linux-2:bpftool-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-headers-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:perf-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:python-perf-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1793883221" }, { "category": "none_available", "date": "2026-10-23T13:17:00Z", "details": "Affected", "product_ids": [ "Amazon-Linux-2:bpftool-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:bpftool-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:bpftool-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:bpftool-0:5.10.272-271.1109.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:bpftool-0:5.10.273-274.1999.amzn2.x86_64", "Amazon-Linux-2:kernel-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:kernel-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-0:5.10.272-271.1109.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:kernel-0:5.10.273-274.1999.amzn2.x86_64", "Amazon-Linux-2:kernel-devel-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", 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