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CVE-2024-26603— x86/fpu: Stop relying on userspace for info to fault in xsave buffer

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux Kernel 存在安全漏洞，该漏洞源于存在缓冲区错误。

AI Predicted 7.8 Difficulty: Hard EPSS 0.28% · P19

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux fcb3635f5018e53024c6be3c3213737f469f74ff< 8bd3eee7720c14b59a206bd05b98d7586bccf99a affected
fcb3635f5018e53024c6be3c3213737f469f74ff< 627339cccdc9166792ecf96bc3c9f711a60ce996 affected
fcb3635f5018e53024c6be3c3213737f469f74ff< b2479ab426cef7ab79a13005650eff956223ced2 affected
fcb3635f5018e53024c6be3c3213737f469f74ff< 627e28cbb65564e55008315d9e02fbb90478beda affected
fcb3635f5018e53024c6be3c3213737f469f74ff< d877550eaf2dc9090d782864c96939397a3c6835 affected
5.14 affected
< 5.14 unaffected
5.15.150≤ 5.15.* unaffected
… +4 more rows
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I. Basic Information for CVE-2024-26603

Vulnerability Information
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Vulnerability Title
x86/fpu: Stop relying on userspace for info to fault in xsave buffer
Source: CVE Program / CVE List V5
Vulnerability 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 ]
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux Kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux Kernel 存在安全漏洞，该漏洞源于存在缓冲区错误。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux fcb3635f5018e53024c6be3c3213737f469f74ff ~ 8bd3eee7720c14b59a206bd05b98d7586bccf99a -
Linux Linux 5.14 -

II. Public POCs for CVE-2024-26603

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III. Intelligence Information for CVE-2024-26603

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Other References for CVE-2024-26603 (4)

Same Patch Batch · Linux · 2024-02-24 · 6 CVEs total

CVE-2024-26601 7.8 HIGH ext4: regenerate buddy after block freeing failed if under fc replay
CVE-2024-26605 PCI/ASPM: Fix deadlock when enabling ASPM
CVE-2024-26604 Revert "kobject: Remove redundant checks for whether ktype is NULL"
CVE-2024-26602 sched/membarrier: reduce the ability to hammer on sys_membarrier
CVE-2024-26600 phy: ti: phy-omap-usb2: Fix NULL pointer dereference for SRP

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-26603

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