{ "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-2026-99204-els_os-amazonlinux2els.json" } ], "tracking": { "current_release_date": "2026-11-07T21:45:08Z", "generator": { "date": "2026-11-07T21:45:08Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-99204-ELS_OS-AMAZONLINUX2ELS", "initial_release_date": "2026-10-28T11:17:00Z", "revision_history": [ { "date": "2026-10-28T11:17:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-11-07T21:45:08Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security 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"vulnerabilities": [ { "cve": "CVE-2026-99204", "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2/dlm: Protect the recovery list during debugfs reads\n\nRecovery participant records must remain alive while debug_state_print()\nwalks reco.node_data and formats their fields. The formatter holds\ndlm->spinlock, but the recovery participant list is protected by\ndlm_reco_state_lock. In particular, dlm_destroy_recovery_area() detaches\nthe list under dlm_reco_state_lock and frees the detached records after\nreleasing it. A concurrent debugfs open can therefore read freed memory.\n\nProtect the participant traversal and field reads in debug_state_print()\nwith dlm_reco_state_lock, matching the existing list writers. This also\nserializes the traversal against list_add_tail() during recovery-area\ninitialization. Make the existing lock available to the debug code\nthrough dlmcommon.h; the lock remains internal to the OCFS2 DLM module.\n\nRelease dlm->spinlock after formatting the other domain state and before\nacquiring dlm_reco_state_lock, so the debug reader does not nest the two\nlocks. Leave recovery list insertion, detachment and freeing unchanged.\n\nKASAN report as below:\n\n BUG: KASAN: slab-use-after-free in debug_state_open+0x1169/0x12d0\n Read of size 4 at addr ffff88810662ef80 by task dlm-state-stres/896\n\n CPU: 1 UID: 0 PID: 896 Comm: dlm-state-stres Not tainted 7.3.0-rc4-next-20260921-pmb-ocfs2-functional-v1+ #1 PREEMPT(lazy)\n Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n Call Trace:\n \n dump_stack_lvl+0x93/0xd0\n print_report+0xce/0x630\n ? debug_state_open+0x1169/0x12d0\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? __virt_addr_valid+0x20e/0x420\n ? debug_state_open+0x1169/0x12d0\n kasan_report+0xe0/0x110\n ? debug_state_open+0x1169/0x12d0\n debug_state_open+0x1169/0x12d0\n ? __pfx_debug_state_open+0x10/0x10\n full_proxy_open_regular+0x193/0x310\n do_dentry_open+0x595/0x12d0\n ? __pfx_full_proxy_open_regular+0x10/0x10\n vfs_open_consume+0xd1/0x400\n ? srso_alias_return_thunk+0x5/0xfbef5\n path_openat+0x18d0/0x2020\n ? __pfx_path_openat+0x10/0x10\n do_file_open+0x21e/0x470\n ? __pfx_do_file_open+0x10/0x10\n ? _raw_spin_unlock+0x23/0x40\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? alloc_fd+0x3a6/0x6b0\n do_sys_openat2+0xf4/0x1b0\n ? __pfx_do_sys_openat2+0x10/0x10\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? __fput+0x5b5/0xa60\n __x64_sys_openat+0x136/0x1e0\n ? __pfx___x64_sys_openat+0x10/0x10\n do_syscall_64+0x114/0x620\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n [Register dump omitted.]\n \n\n Allocated by task 880:\n kasan_save_stack+0x33/0x60\n kasan_save_track+0x14/0x30\n __kasan_kmalloc+0xaa/0xb0\n __kmalloc_cache_noprof+0x28d/0x610\n dlm_remaster_locks+0x147/0x1d90\n dlm_do_recovery+0xde1/0x1580\n dlm_recovery_thread+0x109/0x300\n kthread+0x351/0x460\n ret_from_fork+0x659/0x940\n ret_from_fork_asm+0x1a/0x30\n\n Freed by task 880:\n kasan_save_stack+0x33/0x60\n kasan_save_track+0x14/0x30\n kasan_save_free_info+0x3b/0x60\n __kasan_slab_free+0x5f/0x80\n kfree+0x308/0x580\n dlm_destroy_recovery_area+0x285/0x460\n dlm_remaster_locks+0x17c4/0x1d90\n dlm_do_recovery+0xde1/0x1580\n dlm_recovery_thread+0x109/0x300\n kthread+0x351/0x460\n ret_from_fork+0x659/0x940\n ret_from_fork_asm+0x1a/0x30\n\n The buggy address belongs to the object at ffff88810662ef80\n which belongs to the cache kmalloc-32 of size 32\n The buggy address is located 0 bytes inside of\n freed 32-byte region [ffff88810662ef80, ffff88810662efa0)\n\n [Page and memory-state dumps omitted.]", "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:kernel-tools-0:5.10.272-271.1109.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:kernel-tools-0:5.10.273-274.1999.amzn2.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.272-271.1109.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.273-274.1999.amzn2.x86_64", "Amazon-Linux-2:perf-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:perf-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:perf-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:perf-0:5.10.272-271.1109.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:perf-0:5.10.273-274.1999.amzn2.x86_64", "Amazon-Linux-2:python-perf-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "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-2026-99204" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/03f2fdcc94238a5127ff8a21a4544fd6118cfc7b", "url": "https://git.kernel.org/stable/c/03f2fdcc94238a5127ff8a21a4544fd6118cfc7b" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/04d4571c00db61a9664f387752fa05cb3c08a537", "url": "https://git.kernel.org/stable/c/04d4571c00db61a9664f387752fa05cb3c08a537" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/1c1dbaa16d70cf3d6b9b21503fc188f560376866", "url": "https://git.kernel.org/stable/c/1c1dbaa16d70cf3d6b9b21503fc188f560376866" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/25de9d3b5a81ba7bd52fdc9601f9ea7d1d3d6ae8", "url": "https://git.kernel.org/stable/c/25de9d3b5a81ba7bd52fdc9601f9ea7d1d3d6ae8" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/2bc426a32bfb78868c7f76d9547132837b6b5284", "url": "https://git.kernel.org/stable/c/2bc426a32bfb78868c7f76d9547132837b6b5284" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/403669041cb77bb5ffc5ce92bcfb49b2da3d989d", "url": "https://git.kernel.org/stable/c/403669041cb77bb5ffc5ce92bcfb49b2da3d989d" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/4c435828932bf46f29860e4a0375bcae101b778a", "url": "https://git.kernel.org/stable/c/4c435828932bf46f29860e4a0375bcae101b778a" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/c8bc0d0f2ca3df37ef4d9c69ac5fb7d417d9b035", "url": "https://git.kernel.org/stable/c/c8bc0d0f2ca3df37ef4d9c69ac5fb7d417d9b035" } ], "release_date": "2026-10-28T11:17:00Z", "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": "2026-10-28T11:17:00Z", "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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