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A local use-after-free vulnerability in the Linux kernel perf events subsystem affects the perf/aux handling path in map_range(). The flaw arises because map_range() reads ring-buffer auxiliary page metadata, including aux_pages, aux_nr_pages, and aux_pgoff, while holding only event->mmap_mutex, even though those fields are serialized by rb->aux_mutex. When two perf events share a single ring buffer through PERF_EVENT_IOC_SET_OUTPUT, rb_alloc_aux() can race with map_range(), allowing map_range() to obtain a page pointer from the auxiliary page array while the allocation state is still changing. In the documented race, a page is allocated and exposed through the auxiliary page array, map_range() resolves and maps it as VM_PFNMAP, and the page is later unmapped and freed after the auxiliary offset is updated. Because VM_PFNMAP mappings do not provide page refcount protection, the resulting mapping can reference a freed physical frame, creating a page-level use-after-free condition. The upstream fix is to hold rb->aux_mutex across the page walk in map_range().
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3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An exploitable Linux kernel perf events subsystem flaw affecting certain Intel bare-metal desktop Linux environments under permissive performance-monitoring settings.
An additional exploitable Linux kernel bug in kernel/events/core.c mentioned as a secondary finding alongside the primary vulnerability.
A separate Linux kernel perf/events vulnerability described briefly as a page use-after-free primitive that can be turned into reliable local privilege escalation.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.