CVE - CVE-2024-26603

CVE-ID
CVE-2024-26603	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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 ]
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/627339cccdc9166792ecf96bc3c9f711a60ce996 URL:https://git.kernel.org/stable/c/627339cccdc9166792ecf96bc3c9f711a60ce996 MISC:https://git.kernel.org/stable/c/627e28cbb65564e55008315d9e02fbb90478beda URL:https://git.kernel.org/stable/c/627e28cbb65564e55008315d9e02fbb90478beda MISC:https://git.kernel.org/stable/c/8bd3eee7720c14b59a206bd05b98d7586bccf99a URL:https://git.kernel.org/stable/c/8bd3eee7720c14b59a206bd05b98d7586bccf99a MISC:https://git.kernel.org/stable/c/b2479ab426cef7ab79a13005650eff956223ced2 URL:https://git.kernel.org/stable/c/b2479ab426cef7ab79a13005650eff956223ced2 MISC:https://git.kernel.org/stable/c/d877550eaf2dc9090d782864c96939397a3c6835 URL:https://git.kernel.org/stable/c/d877550eaf2dc9090d782864c96939397a3c6835
Assigning CNA
kernel.org
Date Record Created
20240219	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240219)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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