{ "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-2026-99179-els_os-amazonlinux2els.json" } ], "tracking": { "current_release_date": "2026-11-07T21:40:45Z", "generator": { "date": "2026-11-07T21:40:45Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-99179-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": "2026-11-07T21:40:45Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security 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"vulnerabilities": [ { "cve": "CVE-2026-99179", "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nwatch_queue: Fix note pool publication race in watch_queue_set_size()\n\nThere is a race between watch_queue_set_size() and post_one_notification().\nwatch_queue_set_size() publishes wqueue->notes, notes_bitmap, nr_pages and\nnr_notes with plain stores, and post_one_notification() reads them with\nplain loads under a different lock, so nothing orders the four stores\nagainst the poster's loads: depending on the build, notes can be stored\nlast (gcc 14 on x86-64 does this). Since keyctl_watch_key() lets a watch\nattach to a queue before it is sized, post_one_notification() can already\nbe running on another CPU at that moment: it reads nr_notes > 0, passes\nits bounds check, and then reads notes while it is still NULL,\ndereferencing notes[0].\n\nAn unprivileged user triggers this reliably by watching one of its own\nkeys through a notification pipe and racing ioctl(IOC_WATCH_QUEUE_SET_SIZE)\non that pipe against keyctl(KEYCTL_SETPERM) on the key from another CPU,\ntriggering:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n RIP: 0010:post_one_notification.isra.0+0xa2/0x1e0\n Call Trace:\n __post_watch_notification+0x148/0x180\n keyctl_setperm_key+0x119/0x130\n do_syscall_64+0x108/0x4c0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n Kernel panic - not syncing: Fatal exception in interrupt\n\nFix this by publishing nr_notes last with smp_store_release(), and by\nreading it once with smp_load_acquire() in post_one_notification() before\nthe bitmap and the page array are touched. A poster that observes a\nnon-zero nr_notes then also observes the pool behind it; one that observes\nzero drops the notification as before.", "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/2137d487b25eefa862be70de489b64f4c679fe1f", "url": "https://git.kernel.org/stable/c/2137d487b25eefa862be70de489b64f4c679fe1f" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/4b20867d80e7e91fb7db531f34035d91591ba405", "url": "https://git.kernel.org/stable/c/4b20867d80e7e91fb7db531f34035d91591ba405" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/5e531d62f1f8834faf7a4eed0d41105cf6570a8f", "url": "https://git.kernel.org/stable/c/5e531d62f1f8834faf7a4eed0d41105cf6570a8f" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/6aaa6c1a1b61aae332d6e7e0083140b86ea51e14", "url": "https://git.kernel.org/stable/c/6aaa6c1a1b61aae332d6e7e0083140b86ea51e14" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/811fb6d0b07605e8e8d93bde8748be4b3028809a", "url": "https://git.kernel.org/stable/c/811fb6d0b07605e8e8d93bde8748be4b3028809a" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/9e73a6754457ffed8399b835552013b9363e51d1", "url": "https://git.kernel.org/stable/c/9e73a6754457ffed8399b835552013b9363e51d1" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/da52e5fcb2cae6acdc0d5722ff83499f8232b9d1", "url": "https://git.kernel.org/stable/c/da52e5fcb2cae6acdc0d5722ff83499f8232b9d1" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/f94c45f83e688e41dfe1b3a589806a0a25567260", "url": "https://git.kernel.org/stable/c/f94c45f83e688e41dfe1b3a589806a0a25567260" } ], "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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