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CVE-2024-26603 Detail


In the Linux kernel, the following vulnerability has been resolved: x86/fpu: Stop relying on userspace for info to fault in xsave buffer Before this change, the expected size of the user space buffer was taken from fx_sw->xstate_size. fx_sw->xstate_size can be changed from user-space, so it is possible construct a sigreturn frame where: * fx_sw->xstate_size is smaller than the size required by valid bits in fx_sw->xfeatures. * user-space unmaps parts of the sigrame fpu buffer so that not all of the buffer required by xrstor is accessible. In this case, xrstor tries to restore and accesses the unmapped area which results in a fault. But fault_in_readable succeeds because buf + fx_sw->xstate_size is within the still mapped area, so it goes back and tries xrstor again. It will spin in this loop forever. Instead, fault in the maximum size which can be touched by XRSTOR (taken from fpstate->user_size). [ dhansen: tweak subject / changelog ]


CVSS 4.0 Severity and Metrics:

NVD assessment not yet provided.

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have not published a CVSS score for this CVE at this time. NVD Analysts use publicly available information at the time of analysis to associate CVSS vector strings.

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Hyperlink Resource
https://git.kernel.org/stable/c/627339cccdc9166792ecf96bc3c9f711a60ce996 Patch 
https://git.kernel.org/stable/c/627e28cbb65564e55008315d9e02fbb90478beda Patch 
https://git.kernel.org/stable/c/8bd3eee7720c14b59a206bd05b98d7586bccf99a Patch 
https://git.kernel.org/stable/c/b2479ab426cef7ab79a13005650eff956223ced2 Patch 
https://git.kernel.org/stable/c/d877550eaf2dc9090d782864c96939397a3c6835 Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop') cwe source acceptance level NIST  

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Change History

6 change records found show changes

Quick Info

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