{ "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-2026-89539-els_os-amazonlinux2els.json" } ], "tracking": { "current_release_date": "2026-11-07T21:43:41Z", "generator": { "date": "2026-11-07T21:43:41Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-89539-ELS_OS-AMAZONLINUX2ELS", "initial_release_date": "2026-09-11T20:19:00Z", "revision_history": [ { "date": "2026-09-11T20:19:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-11-07T21:43:41Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security 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"vulnerabilities": [ { "cve": "CVE-2026-89539", "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: reject duplicate CREDS_VALUE options\n\ngssx_dec_option_array() walks the wire-supplied option array and, for\nevery entry whose name matches CREDS_VALUE, calls\ngssx_dec_linux_creds() on the same struct svc_cred. That helper\nunconditionally installs a fresh groups_alloc() result into\ncreds->cr_group_info without releasing whatever pointer was already\nthere:\n\n for (i = 0; i < count; i++) {\n ... decode name ...\n if (length == sizeof(CREDS_VALUE) &&\n memcmp(p, CREDS_VALUE, sizeof(CREDS_VALUE)) == 0) {\n err = gssx_dec_linux_creds(xdr, creds);\n ...\n }\n }\n\nA reply that carries two CREDS_VALUE entries therefore overwrites\ncr_group_info on the second iteration and orphans the group_info\nallocated by the first call. The earlier free_creds path only\nreleases the last cr_group_info via free_svc_cred(), so the first\nallocation's refcount stays at one and its kvmalloc-backed storage\nis leaked. No in-tree caller of gssp_accept_sec_context_upcall()\nexpects more than one CREDS_VALUE per reply.\n\nFix by tracking whether a CREDS_VALUE option has already been\ndecoded and returning -EINVAL on any subsequent match, so the\nfree_creds path releases the single group_info that was installed.", "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-2026-89539" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/2e4ce62385c1b8a887c5370af058ac7b52a8eaf9", "url": "https://git.kernel.org/stable/c/2e4ce62385c1b8a887c5370af058ac7b52a8eaf9" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/4904d61eb2e2bd484000725fd302b8f37b4fcf3a", "url": "https://git.kernel.org/stable/c/4904d61eb2e2bd484000725fd302b8f37b4fcf3a" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/4b5ebb4f91a6152a0f7b1253f701197e5710d4da", "url": "https://git.kernel.org/stable/c/4b5ebb4f91a6152a0f7b1253f701197e5710d4da" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/6207d7df96b3a7f507f0bfc8842b3760ee2fb1f8", "url": "https://git.kernel.org/stable/c/6207d7df96b3a7f507f0bfc8842b3760ee2fb1f8" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/64b9ef369a6f723294613cb129e5f62c35429df5", "url": "https://git.kernel.org/stable/c/64b9ef369a6f723294613cb129e5f62c35429df5" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/7a1d0501cbb962beba23377035d667bf3c1726ee", "url": "https://git.kernel.org/stable/c/7a1d0501cbb962beba23377035d667bf3c1726ee" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/9d94f046b23de0f77849ea69133063c949297e30", "url": "https://git.kernel.org/stable/c/9d94f046b23de0f77849ea69133063c949297e30" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/f615b884310bf82d0014e3b5a92eb9aa88146685", "url": "https://git.kernel.org/stable/c/f615b884310bf82d0014e3b5a92eb9aa88146685" } ], "release_date": "2026-09-11T20:19:00Z", "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": "2026-09-11T20:19:00Z", "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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