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CVE-2025-21919 is an invalid pointer-conversion vulnerability in the Linux kernel fair scheduler function child_cfs_rq_on_list. The function can interpret a prev pointer referencing the run queue's leaf_cfs_rq_list head as a member of a cfs_rq structure, resulting in an invalid container_of conversion. The condition arises because list_add_leaf_cfs_rq places cfs_rq list entries and the run queue list head in the same leaf list, and rq->tmp_alone_branch can reference that head. The invalid conversion can cause memory corruption, memory faults, or access to garbage data, depending on structure layout. The fix checks whether prev references the current run queue's list head before performing the conversion.
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A potential memory corruption vulnerability in the Linux kernel's fair scheduler. An invalid conversion of a runqueue list-head pointer into a cfs_rq structure can cause memory faults or access to garbage data. The current structure layout may conceal the issue, but layout changes could produce unpredictable behavior. The reference assigns a CVSS v3 score of 7.8, with local access and low privileges required. Echo linux package version 6.1.133-1 or later contains the fix.
A potential memory-corruption vulnerability in the Linux kernel scheduler's fair-scheduling code, specifically child_cfs_rq_on_list, affecting Rocky Linux 8 kernel packages.
A high-severity local Linux kernel scheduler flaw in sched/fair that can cause potential memory corruption due to invalid handling of a leaf CFS runqueue list pointer.
A vulnerability addressed by the referenced Alma Linux security update; technical flaw details are not provided.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.