{ "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-2026-98739-els_os-amazonlinux2els.json" } ], "tracking": { "current_release_date": "2026-11-07T21:45:30Z", "generator": { "date": "2026-11-07T21:45:30Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-98739-ELS_OS-AMAZONLINUX2ELS", "initial_release_date": "2026-10-18T16:17:00Z", "revision_history": [ { "date": "2026-10-18T16:17:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-11-07T21:45:30Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security 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"vulnerabilities": [ { "cve": "CVE-2026-98739", "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: Fix initial port reference race\n\nFor RFCOMM_RELEASE_ONHUP devices, rfcomm_tty_install() and\n__rfcomm_release_dev() both use RFCOMM_TTY_OWNED to decide who drops the\ninitial tty_port reference. The release path tests the bit separately\nfrom the install path setting it, so both can drop that reference.\n\nThe synchronous hangup does not prevent this race: port->tty is not\nassigned until tty_port_open(), after installation. The following\ninterleaving is possible:\n\n 1. Install and release each obtain a reference with rfcomm_dev_get().\n 2. Release observes RFCOMM_TTY_OWNED clear.\n 3. Install sets RFCOMM_TTY_OWNED and drops the initial reference.\n 4. Release drops the same initial reference again.\n 5. TTY cleanup drops its reference and frees the device.\n 6. Release performs its final tty_port_put() on the freed port.\n\nKASAN reported:\n\n BUG: KASAN: slab-use-after-free in tty_port_put+0x22/0x190\n Write of size 4 at addr ffff8881001d3d5c by task poc/92\n\n Call Trace:\n tty_port_put+0x22/0x190\n rfcomm_dev_ioctl+0x1d4/0x1930\n sock_do_ioctl+0x110/0x260\n sock_ioctl+0x380/0x590\n __x64_sys_ioctl+0x134/0x1c0\n\n Allocated by task 88:\n rfcomm_dev_ioctl+0x8f6/0x1930\n sock_do_ioctl+0x110/0x260\n sock_ioctl+0x380/0x590\n __x64_sys_ioctl+0x134/0x1c0\n\n Freed by task 65:\n kfree+0x131/0x3c0\n rfcomm_dev_destruct+0x23b/0x2f0\n release_one_tty+0xc1/0x370\n process_one_work+0x661/0x1090\n\nUse test_and_set_bit() in both paths so that only the caller that changes\nRFCOMM_TTY_OWNED from clear to set drops the initial reference. Each path\nkeeps its own lookup reference until release or TTY cleanup, preserving\nthe existing callback ordering and error handling.", "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/0a554901bd227537f79220443b2b36d585d62893", "url": "https://git.kernel.org/stable/c/0a554901bd227537f79220443b2b36d585d62893" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/2d696c1ed3468dcb62578a3911e687110d463520", "url": "https://git.kernel.org/stable/c/2d696c1ed3468dcb62578a3911e687110d463520" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/55d162aa00d1ee33c3e6fa88b71f1e2d6e1441e9", "url": "https://git.kernel.org/stable/c/55d162aa00d1ee33c3e6fa88b71f1e2d6e1441e9" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/a03ccf1ab77380d4c4a3c56552e12de4a83efa21", "url": "https://git.kernel.org/stable/c/a03ccf1ab77380d4c4a3c56552e12de4a83efa21" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/c50360a019766fafa27318928bfea96dcce8a37d", "url": "https://git.kernel.org/stable/c/c50360a019766fafa27318928bfea96dcce8a37d" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/cd247e38b14df48d6b3940c4573a9f7acb10c363", "url": "https://git.kernel.org/stable/c/cd247e38b14df48d6b3940c4573a9f7acb10c363" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/d3dd18e85c140df72e0f2b5ee156ebfba04c06cb", "url": "https://git.kernel.org/stable/c/d3dd18e85c140df72e0f2b5ee156ebfba04c06cb" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/e5aa7fbf7a4446bb89f0b8394b2dfc1a6b6aba5b", "url": "https://git.kernel.org/stable/c/e5aa7fbf7a4446bb89f0b8394b2dfc1a6b6aba5b" } ], "release_date": "2026-10-18T16:17:00Z", "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": "2026-10-18T16:17:00Z", "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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