{ "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-2026-99234-els_os-amazonlinux2els.json" } ], "tracking": { "current_release_date": "2026-11-07T21:45:00Z", "generator": { "date": "2026-11-07T21:45:00Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-99234-ELS_OS-AMAZONLINUX2ELS", "initial_release_date": "2026-11-02T16:17:00Z", "revision_history": [ { "date": "2026-11-02T16:17:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-11-07T21:45:00Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security 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"vulnerabilities": [ { "cve": "CVE-2026-99234", "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Unregister field variable histograms when the command fails\n\nAn action that names a field on another event needs that field as a\nvariable, so create_field_var_hist() registers a second hist trigger on\nthat event to provide it, and records it in\ntarget_hist_data->field_var_hists[].\n\nIf a later part of the same command fails, create_actions() returns an\nerror and event_hist_trigger_parse() jumps to out_free. The write fails\nwith -EINVAL and sched_switch gets no trigger, but:\n\n # echo 'hist:keys=pid:ts0=common_timestamp.usecs' >> \\\n events/sched/sched_waking/trigger\n # echo 'my_synth u64 lat; int a; int b' >> synthetic_events\n # echo 'hist:keys=next_pid:wakeup_lat=common_timestamp.usecs-$ts0:\\\n onmatch(sched.sched_waking).my_synth($wakeup_lat,prio,nosuchfld)'\\\n >> events/sched/sched_switch/trigger\n # cat events/sched/sched_waking/trigger\n hist:keys=pid:vals=hitcount:ts0=common_timestamp.usecs:sort=hitcount:size=2048:clock=global [active]\n hist:keys=pid:vals=hitcount:synthetic_prio=prio:sort=hitcount:size=2048 [active]\n\nThe second histogram is the one created for 'prio'. It is still active and\nstill counting.\n\nout_free reaches destroy_field_var_hists(), which frees the\nfield_var_hists[] entries, but never unregister_field_var_hists(), which is\nwhat removes the triggers and runs only from event_hist_trigger_free(). The\nentry is freed and the trigger is left with nothing tracking it.\n\nUnregister the field variable histograms in out_free as well, and record\neach one as soon as its trigger is registered rather than after the lookup\nthat follows it, so no exit can leave a registered trigger untracked. The\nentry then belongs to field_var_hists[] and is released by\ndestroy_field_var_hists(), so freeing it on that exit would be a double\nfree.", "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/431959fc76456cbba539279fe8967aa9391e6f23", "url": "https://git.kernel.org/stable/c/431959fc76456cbba539279fe8967aa9391e6f23" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/5afb9317e2eeb1c7021a82995ce244fda5a4bd4f", "url": "https://git.kernel.org/stable/c/5afb9317e2eeb1c7021a82995ce244fda5a4bd4f" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/8482ec5b65f606d5bbcec518e0afc69ad65ca414", "url": "https://git.kernel.org/stable/c/8482ec5b65f606d5bbcec518e0afc69ad65ca414" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/91c14d6c13096091c56304120aaa26e479130b8b", "url": "https://git.kernel.org/stable/c/91c14d6c13096091c56304120aaa26e479130b8b" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/a3d7ffd2409700748a495b645948fef48199206e", "url": "https://git.kernel.org/stable/c/a3d7ffd2409700748a495b645948fef48199206e" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/aae0ccd7326eef78dcdefffef3d1253e6f0615ca", "url": "https://git.kernel.org/stable/c/aae0ccd7326eef78dcdefffef3d1253e6f0615ca" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/d0090baf02dd08f6e909f36f0ad54a4e80f5e79b", "url": "https://git.kernel.org/stable/c/d0090baf02dd08f6e909f36f0ad54a4e80f5e79b" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/dba0f492703956801149cc70b39d2650a37995c3", "url": "https://git.kernel.org/stable/c/dba0f492703956801149cc70b39d2650a37995c3" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/f21351d1c4cdcc6a68f03636a407c2af1a5e1e10", "url": "https://git.kernel.org/stable/c/f21351d1c4cdcc6a68f03636a407c2af1a5e1e10" } ], "release_date": "2026-11-02T16:17:00Z", "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": "2026-11-02T16:17:00Z", "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", 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