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CVE-2023-52476 is a flaw in the Linux kernel x86 perf Last Branch Record (LBR) sampling implementation. When a legacy vsyscall executes while LBR sampling is active and is interrupted by a perf non-maskable-interrupt sample, the LBR branch-type decoding path can attempt to fetch instruction data from the vsyscall region. The resulting unhandled page fault produces an oops and can panic the kernel. The correction filters vsyscall-region addresses during branch-type determination and classifies them as having no branch type.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel perf x86 last-branch-record handling vulnerability involving vsyscall addresses.
Linux kernel perf/x86 LBR flaw involving vsyscall-address handling.
Linux kernel perf/x86 LBR vsyscall-address filtering issue.
Linux kernel x86 perf LBR vsyscall-address filtering vulnerability.
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.