{ "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-2026-97557-els_os-amazonlinux2els.json" } ], "tracking": { "current_release_date": "2026-11-07T21:45:25Z", "generator": { "date": "2026-11-07T21:45:25Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-97557-ELS_OS-AMAZONLINUX2ELS", "initial_release_date": "2026-09-25T11:17:00Z", "revision_history": [ { "date": "2026-09-25T11:17:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-11-07T21:45:25Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security 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"vulnerabilities": [ { "cve": "CVE-2026-97557", "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: avoid leaking refcount in cifs_queue_oplock_break()\n\ncifs_queue_oplock_break() unconditionally takes a reference on the\ntarget file before queueing cifs_oplock_break(). Only that work item\ndecreases the reference counter again.\n\nIf another oplock break arrives while that work is still queued,\nqueue_work() will return false and not queue this second work item. As a\nresult, we will never reach the point to drop the file reference again\nand are leaking this reference. This can be triggered when interacting\nwith a slow-responding server.\n\nAs a result, later unmount operations for this file system will fail with\n\n BUG: Dentry ... still in use (1) [unmount of cifs cifs]\n VFS: Busy inodes after unmount of cifs (cifs)\n kernel BUG at fs/super.c:777!\n\nFix this by only incrementing the reference count if the work has been\nqueued successfully. Taking it after queue_work() is safe because all\nthree callers hold tcon->open_file_lock across the call and\n_cifsFileInfo_put() decrements under that same lock, so a worker that\nstarts the handler in the window cannot drop the reference before it has\nbeen taken.", "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": [ 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URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-97557" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/0fb92ac85db58945ad7b970ff17674001487b3a3", "url": "https://git.kernel.org/stable/c/0fb92ac85db58945ad7b970ff17674001487b3a3" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/13b9519b19e6e58a6cd01e63062cd1da7bd6449a", "url": "https://git.kernel.org/stable/c/13b9519b19e6e58a6cd01e63062cd1da7bd6449a" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/2ed2c29dd9593637cfa25ac1eb23241b20202778", "url": "https://git.kernel.org/stable/c/2ed2c29dd9593637cfa25ac1eb23241b20202778" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/735a3a610136ae10f381d0909dff38e5b5c5f056", "url": "https://git.kernel.org/stable/c/735a3a610136ae10f381d0909dff38e5b5c5f056" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/9f2e63f1b2d5fc5b5423424902c091123e220e7e", "url": "https://git.kernel.org/stable/c/9f2e63f1b2d5fc5b5423424902c091123e220e7e" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/af0193bbf1ac8c0f67f972998b0cc629d6116cf6", "url": "https://git.kernel.org/stable/c/af0193bbf1ac8c0f67f972998b0cc629d6116cf6" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/de2a6bcff2659bea40c7485115b57f0ae189fc01", "url": "https://git.kernel.org/stable/c/de2a6bcff2659bea40c7485115b57f0ae189fc01" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/dfe7b750c7e069873a8a57a11c816831a235618a", "url": "https://git.kernel.org/stable/c/dfe7b750c7e069873a8a57a11c816831a235618a" } ], "release_date": "2026-09-25T11:17:00Z", "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": "2026-09-25T11:17:00Z", "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", 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