{ "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-2026-99054-els_os-amazonlinux2els.json" } ], "tracking": { "current_release_date": "2026-11-07T21:42:52Z", "generator": { "date": "2026-11-07T21:42:52Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-99054-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": "2026-11-07T21:42:52Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security 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"vulnerabilities": [ { "cve": "CVE-2026-99054", "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: destroy topsrv workqueues before closing connections\n\ntipc_topsrv_stop() closed subscriber connections while the topology\nserver's send and receive workqueues were still running. Socket\ncallbacks and subscription events could then queue more work, and\nin-flight send/recv work could drop the last connection reference\nduring the conn_idr walk.\n\nThat race produced several teardown failures: refcount_t addition on\n0 from conn_get() on a connection whose release was blocked on\nidr_lock, a subsequent use-after-free in tipc_conn_close(),\nqueue_work() on an already destroyed workqueue from the listener\ndata-ready callback, and an RCU stall in tipc_topsrv_exit_net()\nwhile the walk spun under idr_lock.\n\nClear srv->listener under idr_lock so it acts as a shutdown flag,\nskip queue_work() once it is NULL, destroy the workqueues to flush\nin-flight work, and only then close the remaining connections.\nRefuse tipc_conn_lookup() after that flag is cleared, and drop\nidr_lock when the teardown walk finds no connection, so an\nin-flight subscription event cannot pin idr_in_use while the\nwalk holds the lock.\n\nv3 supersedes the narrower in-thread diff Tung Quang Nguyen\nposted on 2026-09-23. It keeps his teardown order and adds the\nlookup refusal and the empty-idr unlock.", "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", 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"external", "summary": "https://git.kernel.org/stable/c/09dbd610f78aaed65d7b379c270ce4090a8151ac", "url": "https://git.kernel.org/stable/c/09dbd610f78aaed65d7b379c270ce4090a8151ac" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/0af8780bdfdfc91fb9127bddb9c48fab67dc9d9e", "url": "https://git.kernel.org/stable/c/0af8780bdfdfc91fb9127bddb9c48fab67dc9d9e" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/21622e5ae8b232c2e64eb1adf5546cf078d2987d", "url": "https://git.kernel.org/stable/c/21622e5ae8b232c2e64eb1adf5546cf078d2987d" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/3acdd44385bc7e2e57605e073691ce69cc5a960d", "url": "https://git.kernel.org/stable/c/3acdd44385bc7e2e57605e073691ce69cc5a960d" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/7167afaaaee37191f8b6afa0c91e0fef41460705", "url": "https://git.kernel.org/stable/c/7167afaaaee37191f8b6afa0c91e0fef41460705" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/7f796bb3b440d7f1b14c0e3b520462eb34f553af", "url": "https://git.kernel.org/stable/c/7f796bb3b440d7f1b14c0e3b520462eb34f553af" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/da9c16568bc79140a54c1f5fcf07a0305df47b37", "url": "https://git.kernel.org/stable/c/da9c16568bc79140a54c1f5fcf07a0305df47b37" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/fb717c536af2aafeca520ff11d1e0f25f7ab8fa9", "url": "https://git.kernel.org/stable/c/fb717c536af2aafeca520ff11d1e0f25f7ab8fa9" } ], "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", 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