{ "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-2026-99053-els_os-amazonlinux2els.json" } ], "tracking": { "current_release_date": "2026-11-07T21:43:51Z", "generator": { "date": "2026-11-07T21:43:51Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-99053-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": "2026-11-07T21:43:51Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security 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"vulnerabilities": [ { "cve": "CVE-2026-99053", "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: hold a reference to nodes found by link name\n\ntipc_node_find_by_name() returns a node after dropping its RCU read lock\nwithout taking a reference. The LINK_SET, LINK_GET and LINK_RESET_STATS\nhandlers then lock and access the node, racing with timer-driven cleanup of\na down peer. Generic netlink serialization does not exclude the node\ntimer.\n\nThe following interleaving can leave a handler using a freed node:\n\n CPU 0: find the node under RCU and release the node read lock\n CPU 1: tipc_node_timeout() clears the links and unlinks the down node\n CPU 1: drop the list and timer references, queuing tipc_node_free()\n CPU 0: leave the RCU read-side critical section\n CPU 1: complete the grace period and free the node\n CPU 0: acquire the node lock through the stale pointer\n\nLINK_SET also uses the node's media address after releasing the node lock,\nwhen passing queued packets to tipc_bearer_xmit().\n\nKASAN on v7.3-rc5 reported:\n\n BUG: KASAN: slab-use-after-free in _raw_read_lock_bh\n Write of size 4 at addr ffff88807e06f008 by task poc/92\n Call Trace:\n _raw_read_lock_bh kernel/locking/spinlock.c:287\n tipc_nl_node_set_link net/tipc/node.c:2475\n genl_family_rcv_msg_doit net/netlink/genetlink.c:1114\n genl_rcv_msg net/netlink/genetlink.c:1209\n netlink_rcv_skb net/netlink/af_netlink.c:2575\n\n Allocated by task 0:\n tipc_node_create net/tipc/node.c:539\n tipc_node_check_dest net/tipc/node.c:1196\n tipc_disc_rcv net/tipc/discover.c:252\n\n Freed by task 92:\n kfree mm/slub.c:6801\n rcu_core kernel/rcu/tree.c:2919\n\n Last potentially related work creation:\n __call_rcu_common.constprop.0 kernel/rcu/tree.c:3181\n tipc_node_timeout net/tipc/node.c:814\n\nAcquire a reference to the selected node with kref_get_unless_zero() before\nleaving RCU, returning NULL if the node has already been released. Release\nthat reference on every caller exit after the last node access, including\ntransmission in LINK_SET. Keep the existing link lookup order and locking\nso concurrent link removal still takes the existing error paths.", "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", 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"external", "summary": "https://git.kernel.org/stable/c/1428c5f1d346a2e1ac9156713975a72246957009", "url": "https://git.kernel.org/stable/c/1428c5f1d346a2e1ac9156713975a72246957009" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/17e73bae400f6a434dc006e3bee92c94cf781954", "url": "https://git.kernel.org/stable/c/17e73bae400f6a434dc006e3bee92c94cf781954" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/384edc67201f8561b7de952647b923f0524b1f36", "url": "https://git.kernel.org/stable/c/384edc67201f8561b7de952647b923f0524b1f36" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/3c3b308ee6e25729a6cf09b69cdd0e093220d40b", "url": "https://git.kernel.org/stable/c/3c3b308ee6e25729a6cf09b69cdd0e093220d40b" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/5b7e58e8be90f4e8530e7a60372d003dfa7fd666", "url": "https://git.kernel.org/stable/c/5b7e58e8be90f4e8530e7a60372d003dfa7fd666" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/92f3b3368722631e933a4db0cf8bd578ed08cd9c", "url": "https://git.kernel.org/stable/c/92f3b3368722631e933a4db0cf8bd578ed08cd9c" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/b60259d4047fbb735476c729dcf9306a038b6110", "url": "https://git.kernel.org/stable/c/b60259d4047fbb735476c729dcf9306a038b6110" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/f17e70206a1e763fcca2578a8db3c4eed0f843a9", "url": "https://git.kernel.org/stable/c/f17e70206a1e763fcca2578a8db3c4eed0f843a9" } ], "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", 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