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CVE-2023-52463 is a flaw in the Linux kernel efivarfs filesystem on UEFI systems whose firmware does not implement the SetVariable runtime service. In this configuration, efivarfs is initially mounted read-only and no SetVariable callback is assigned. Vulnerable kernels fail to preserve that restriction during a remount request, allowing efivarfs to be remounted read-write. A subsequent EFI variable write invokes the unassigned callback through the efivarfs write path, resulting in a kernel NULL pointer dereference. The issue was introduced in Linux kernel 5.8.
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What an attacker gets, and what they’ve been doing with it.
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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.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel vulnerability in efivarfs related to forcing read-only remount behavior when SetVariable is not supported.
Linux kernel efivarfs remount protection issue involving unsupported EFI SetVariable operations.
Linux kernel efivarfs remount protection issue.
Linux kernel efivarfs security flaw fixed in the updated container image.
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.