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CVE-2024-26603 is a denial-of-service vulnerability in the Linux kernel x86 FPU signal-frame restore path. The affected code uses the userspace-controlled xstate_size field in the XSAVE software-reserved area to determine how much of the FPU buffer to fault in before invoking XRSTOR. An attacker can construct a sigreturn frame whose xstate_size is smaller than the state size implied by its xfeatures bits, then make a portion of the state required by XRSTOR inaccessible. The preliminary accessibility check can succeed while XRSTOR faults on the unmapped portion, causing the kernel to retry indefinitely. The fix faults in the maximum buffer size XRSTOR may access, using the kernel-derived fpstate user_size rather than the userspace-supplied size.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
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 x86 FPU/XSAVE handling flaw that can cause an endless loop.
Linux kernel x86 FPU flaw that could cause an endless loop while faulting in an XSAVE buffer.
Linux kernel x86 FPU XSAVE-buffer handling flaw that can cause an endless loop.
Linux kernel x86 FPU handling issue that can result in an infinite loop while faulting in an XSAVE buffer.
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.