{ "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-2026-99180-els_os-amazonlinux2els.json" } ], "tracking": { "current_release_date": "2026-11-07T21:45:04Z", "generator": { "date": "2026-11-07T21:45:04Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-99180-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": "2026-11-07T21:45:04Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security 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"vulnerabilities": [ { "cve": "CVE-2026-99180", "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nunicode: free the map after a grace period\n\ngeneric_ci_d_hash() and generic_ci_d_compare() read sb->s_encoding and\ndereference the unicode map while a pathwalk in rcu mode holds nothing\nbut rcu_read_lock(). The filesystems that use them, ext4, f2fs and\ntmpfs, drop the map with utf8_unload() from ->put_super(), which runs\nwhen the last reference to the mount goes away. A lookup that is still\ninside such a filesystem at that point reads a freed map.\n\nWith a pathwalk held up in utf8_casefold_hash() while the last reference\nto a casefolded tmpfs goes away:\n\n BUG: KASAN: slab-use-after-free in utf8nlookup+0x74c/0x950\n Read of size 8 at addr ff110001030fe658 by task walker/98\n Call Trace:\n \n utf8nlookup+0x74c/0x950\n utf8byte+0x160/0x1560\n utf8_casefold_hash+0x167/0x230\n generic_ci_d_hash+0xdd/0x1c0\n link_path_walk+0x11ad/0x1d30\n path_lookupat+0x63/0xb00\n filename_lookup+0x1f1/0x5b0\n vfs_statx+0xd7/0x3b0\n [...]\n Allocated by task 94:\n __kmalloc_cache_noprof+0x249/0x560\n utf8_load+0x4e/0x570\n shmem_parse_opt_casefold.isra.0+0x92/0x270\n [...]\n Freed by task 97:\n kfree+0x1db/0x5b0\n shmem_put_super+0x72/0x170\n generic_shutdown_super+0x14c/0x530\n kill_anon_super+0x3a/0x60\n deactivate_locked_super+0x9c/0xf0\n cleanup_mnt+0x9f/0x130\n\nSo far that has been hard to hit. umount(2) waits for a grace period\nin namespace_unlock() before it drops the mount, so only a mount whose\nlast reference goes away elsewhere, like the close of a file or a chdir\nout of a lazily unmounted directory, can race a walker. So it is\nreachable.\n\nDelay the free until a grace period has passed. The map and the data\ntable it holds a reference to then outlive any pathwalk that found the\nsuperblock before the mount went away. The reference on the data table\nmodule is dropped from the rcu callback as well. utf8-core is built in\nwhenever CONFIG_UNICODE is set, so there is no module exit that would\nhave to wait for the callbacks.\n\nOverlayfs points the s_encoding of an overlay at the map of its first\nlayer without taking a reference of its own. That stays correct. The\nlayer is held by the overlay, so its map is dropped only after the\noverlay is gone.", "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/092e14e1479a39157ca01668d43e4649793f39ed", "url": "https://git.kernel.org/stable/c/092e14e1479a39157ca01668d43e4649793f39ed" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/2b54d3c971a1e5df3c9b0bcc10311ae6c29e79d8", "url": "https://git.kernel.org/stable/c/2b54d3c971a1e5df3c9b0bcc10311ae6c29e79d8" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/5d7687b0b71601cc32f1bfd62f56cf5eea3e5a07", "url": "https://git.kernel.org/stable/c/5d7687b0b71601cc32f1bfd62f56cf5eea3e5a07" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/6472455f2b015cad43adb790cb63fe1d3cff2f57", "url": "https://git.kernel.org/stable/c/6472455f2b015cad43adb790cb63fe1d3cff2f57" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/6560c3d9a6925e3747d9ad8463e16010c31ba715", "url": "https://git.kernel.org/stable/c/6560c3d9a6925e3747d9ad8463e16010c31ba715" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/69a0d6b31d05e856c7335509222f25321e3c69ca", "url": "https://git.kernel.org/stable/c/69a0d6b31d05e856c7335509222f25321e3c69ca" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/a96c5299bd7305eb984377681eb3222a57376405", "url": "https://git.kernel.org/stable/c/a96c5299bd7305eb984377681eb3222a57376405" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/f96c2731a105d6663c606388f5dc21781e00ade5", "url": "https://git.kernel.org/stable/c/f96c2731a105d6663c606388f5dc21781e00ade5" } ], "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", 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