{ "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-2026-89763-els_os-amazonlinux2els.json" } ], "tracking": { "current_release_date": "2026-11-07T21:44:47Z", "generator": { "date": "2026-11-07T21:44:47Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-89763-ELS_OS-AMAZONLINUX2ELS", "initial_release_date": "2026-09-11T20:20:00Z", "revision_history": [ { "date": "2026-09-11T20:20:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-11-07T21:44:47Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security 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"vulnerabilities": [ { "cve": "CVE-2026-89763", "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nKEYS: trusted: Fix TPM teardown ordering\n\ntrusted_tpm_exit() drops the TPM chip reference and frees the digest\narray before unregistering the trusted key type. key_type_lookup()\nholds key_types_sem for reading until the key operation finishes, while\nunregister_key_type() takes it for writing. It therefore provides the\nsynchronization point that must precede backend teardown.\n\nThe current order permits this interleaving:\n\n CPU 0 CPU 1\n trusted_tpm_exit() key_type_lookup(\"trusted\")\n put_device(&chip->dev) trusted_tpm_seal()\n kfree(digests) pcrlock()\n unregister_key_type() tpm_pcr_extend(..., digests)\n\nCPU 1 can consequently dereference the freed digest array. The chip can\nalso be released before callbacks stop using it.\n\nKASAN reported:\n\n BUG: KASAN: slab-use-after-free in tpm_pcr_extend+0x1f0/0x200\n Read of size 2 at addr ffff88810872d000 by task poc/89\n Call Trace:\n tpm_pcr_extend+0x1f0/0x200\n pcrlock+0x42/0x70 [trusted]\n trusted_tpm_seal+0x1b6/0x570 [trusted]\n trusted_instantiate+0x293/0x340 [trusted]\n __key_instantiate_and_link+0xb2/0x2b0\n __key_create_or_update+0x61e/0xb50\n __do_sys_add_key+0x1b8/0x310\n Allocated by task 88:\n __kmalloc_noprof+0x1a7/0x490\n do_one_initcall+0xa1/0x390\n do_init_module+0x2df/0x840\n Freed by task 90:\n kfree+0x131/0x3c0\n trusted_tpm_exit+0x59/0xa0 [trusted]\n __do_sys_delete_module+0x346/0x510\n\nMove unregister_key_type() before releasing either resource. This stops\nnew lookups and waits for in-flight key operations to finish before the\nbackend state is destroyed.", "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/2f7541afbc57fe9d26769a22c31d8ce8790c9a19", "url": "https://git.kernel.org/stable/c/2f7541afbc57fe9d26769a22c31d8ce8790c9a19" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/3d67b4acbfc7af331d887a8efc04bef6573b8a7a", "url": "https://git.kernel.org/stable/c/3d67b4acbfc7af331d887a8efc04bef6573b8a7a" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/5e2d672280d97d83de43031d93761b12dadd7b8a", "url": "https://git.kernel.org/stable/c/5e2d672280d97d83de43031d93761b12dadd7b8a" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/6564808189c9a1e682ee7b5e70f5f1c73c89c3a4", "url": "https://git.kernel.org/stable/c/6564808189c9a1e682ee7b5e70f5f1c73c89c3a4" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/753c978f2400f9783eb524842a975d3ac950d511", "url": "https://git.kernel.org/stable/c/753c978f2400f9783eb524842a975d3ac950d511" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/81dfc6c665547a4e41721b6716f894f263a5e03f", "url": "https://git.kernel.org/stable/c/81dfc6c665547a4e41721b6716f894f263a5e03f" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/b254cdadbcb6bdd0daf7391d63b3b97b2bec1ad9", "url": "https://git.kernel.org/stable/c/b254cdadbcb6bdd0daf7391d63b3b97b2bec1ad9" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/c96518231608bbf9568f539aadb20a8e366b54c7", "url": "https://git.kernel.org/stable/c/c96518231608bbf9568f539aadb20a8e366b54c7" } ], "release_date": "2026-09-11T20:20:00Z", "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": "2026-09-11T20:20:00Z", "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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