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CVE-2023-1998 is an improper isolation flaw in Linux kernel handling of Spectre v2 (Branch Target Injection) mitigations on systems using simultaneous multithreading. A userspace process can request speculation control through PR_SET_SPECULATION_CTRL, including in conjunction with seccomp, but the kernel can fail to provide the expected cross-thread protection when plain (legacy) IBRS is selected. The kernel determined that explicit STIBP was unnecessary because IBRS implicitly protects against cross-thread BTI. However, legacy IBRS is cleared on return to userspace for performance, removing that implicit protection and leaving the process vulnerable to branch-target injection from a sibling hardware thread.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel Spectre v2 simultaneous multithreading mitigation issue.
Linux kernel Spectre v2 simultaneous multithreading mitigation issue.
Linux kernel Spectre v2 simultaneous multithreading mitigation issue.
Linux kernel issue affecting Spectre v2 simultaneous multithreading mitigations.
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.