CVE-2024-26603

CVE Details

Release Date:

2024-02-24

Description

In the Linux kernel, the following vulnerability has been resolved:\nx86/fpu: Stop relying on userspace for info to fault in xsave buffer\nBefore this change, the expected size of the user space buffer was\ntaken from fx_sw->xstate_size. fx_sw->xstate_size can be changed\nfrom user-space, so it is possible construct a sigreturn frame where:\n* fx_sw->xstate_size is smaller than the size required by valid bits in\nfx_sw->xfeatures.\n* user-space unmaps parts of the sigrame fpu buffer so that not all of\nthe buffer required by xrstor is accessible.\nIn this case, xrstor tries to restore and accesses the unmapped area\nwhich results in a fault. But fault_in_readable succeeds because buf +\nfx_sw->xstate_size is within the still mapped area, so it goes back and\ntries xrstor again. It will spin in this loop forever.\nInstead, fault in the maximum size which can be touched by XRSTOR (taken\nfrom fpstate->user_size).\n[ dhansen: tweak subject / changelog ]

See more information about CVE-2024-26603 from MITRE CVE dictionary and NIST NVD

CVSS Scoring

NOTE: The following CVSS v3.1 metrics and score provided are preliminary and subject to review.

Base Score:	5.5	CVSS Vector:	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector:	Local network	Attack Complexity:	Low
Privileges Required:	Low	User Interaction:	None
Scope:	Unchanged	Confidentiality Impact:	None
Integrity Impact:	None	Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (kernel)	ELSA-2024-3618	2024-06-05
Oracle Linux version 9 (kernel)	ELSA-2024-9315	2024-11-14