{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-99205 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-99205 is a vulnerability in Linux, published on 28 Oct 2026."},"fix_prompt":"Check this codebase for CVE-2026-99205 and fix it if it is affected.\n\nWhat it is: CVE-2026-99205 is a vulnerability in Linux, published on 28 Oct 2026. \nExploitation: There is no known exploitation of CVE-2026-99205 in the wild and no public exploit code.\n\nAffected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-99205/ (Markdown: https://insights.sbomify.com/CVE-2026-99205/index.md)","id":"CVE-2026-99205","markdown":"https://insights.sbomify.com/CVE-2026-99205/index.md","name":"CVE-2026-99205","record":{"aliases":["DEBIAN-CVE-2026-99205","GHSA-2frc-h2g3-59hw","UBUNTU-CVE-2026-99205"],"analysis":null,"analysis_generated_by":null,"assigner":"Linux","cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsched/core: Call wakeup_preempt() for queued tasks during class change\n\nPaul reported recent RCU changes exposed a lost resched where CPU idles\nwith a rcutorture thread waiting while being completely runnable.\n\nDumping the rq state at the time of idling with runnable tasks showed\nthe following:\n\n rq-\u003enext_class = \u0026fair_sched_class\n rq-\u003enr_running = 1\n rq-\u003ecfs.h_nr_queued = 0\n rq-\u003ert.rt_nr_running = 1\n\nAlthough the waiting task was an RT task, \"rq-\u003enext_class\" did not point\nto rt_sched_class and was stuck at the lower priority fair_sched_class.\n\nInspecting sched_change_end() revealed the following race with\n__sched_setscheduler() for queued, but non-running tasks:\n\n CPU0 CPU1\n ==== ====\n\n __schedule()\n\n /*\n * rq-\u003edonor is a fair task that blocks.\n * rq-\u003enext_class = \u0026fair_sched_class\n */\n\n rq_lock(rq0)\n\n pick_next_task()\n /* nr_running = 0 */\n pick_task_fair()\n sched_balance_newidle()\n raw_spin_rq_unlock(rq0)\n rq_lock(rq0)\n\n activate_task(rq0, p)\n /* p is a fair task */\n rq0-\u003enr_running++;\n rq0-\u003ecfs.h_nr_queued++;\n wakeup_preempt(rq, p)\n rq-\u003enext_class = \u0026fair_sched_class\n resched_curr()\n\n rq_unlock(rq0)\n\n __sched_setscheduler(p)\n /* p is moved to SCHED_RR */\n task_rq_lock(p)\n sched_change_begin()\n\n\t\t\t\t rq0-\u003ecfs.h_nr_queued--;\n\t\t\t\t rq0-\u003ert.rt_nr_running++;\n\n sched_change_end()\n /*\n * p-\u003eon_rq = 1 (ctx-\u003equeued)\n * but p is not rq-\u003edonor\n * (!ctx-\u003erunning) hence\n * resched_curr() is and\n * rq-\u003enext_class upgrade is\n * skipped.\n */\n\n task_rq_unlock()\n\n raw_spin_rq_lock(rq0)\n\n /*\n * rq-\u003enr_running = 1\n * rq-\u003ecfs.h_nr_queued = 0\n * rq-\u003ert.rt_nr_running = 1\n * rq-\u003enext_class = \u0026fair_sched_class\n */\n\n if (rq-\u003ecfs.h_nr_queued \u0026\u0026 ...)\n /* Above is false */\n\n if (rq_modified_above(this_rq, \u0026fair_sched_class))\n /* Also false since rq-\u003enext_class is still fair */\n\n /*\n * sched_balance_newidle() is considered to\n * have failed to pull any fair tasks and no\n * other wakeups were detected.\n */\n return NULL; /* pick_task_fair() */\n\n pick_task_idle()\n return rq-\u003eidle;\n\n next = rq-\u003eidle;\n\n /* Preemption indicators are lost */\n clear_tsk_need_resched(prev);\n clear_preempt_need_resched();\n\n rq-\u003ecurr = rq-\u003eidle;\n\n !!! rq-\u003eidle switches in with rq-\u003erunning == 1 but !need_resched() !!!\n\nIn simple words, enqueue, followed by a class change of the newly queued\ntask goes unnoticed in rq-\u003enext_class indicator and\nsched_balance_newidle() sees no fair task, nor any higher priority task\nenqueued.\n\nThe above sequence will lead to CPU idling with a runnable task on the\nCPU.\n\nCall wakeup_preempt() for ctx-\u003equeued cases in sched_change_end() to\nre-evaluate rq-\u003enext_class after class change (ENQUEUE_CLASS) and set\nthe NEED_RESCHED indicator accordingly.\n\nNewidle balance will correctly see an enqueue of a higher priority\nt\n---truncated---","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"sched/core: Call wakeup_preempt() for queued tasks during class change","id":"CVE-2026-99205","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"scsi: target: iscsi: Fix race in discovery auth updates","id":"CVE-2026-99206"},"packages":[],"prev":{"headline":"ocfs2/dlm: Protect the recovery list during debugfs reads","id":"CVE-2026-99204"},"products":["Linux"],"published":"2026-10-28","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-28","vendors":["Linux"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-99205/"}