CVE-2021-3753

Description

A race problem was seen in the vt_k_ioctl in drivers/tty/vt/vt_ioctl.c in the Linux kernel, which may cause an out of bounds read in vt as the write access to vc_mode is not protected by lock-in vt_ioctl (KDSETMDE). The highest threat from this vulnerability is to data confidentiality.

CVSS Metrics

• v3.1•MEDIUM•Score: 4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
• v2.0•LOW•Score: 1.9AV:L/AC:M/Au:N/C:P/I:N/A:N

EPSS Trends

Current EPSS score: 0.02%• Percentile: 4%

Techniques & Countermeasures

• CWE-362•Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

  The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

• CWE-125•Out-of-bounds Read

  The product reads data past the end, or before the beginning, of the intended buffer.

Affected Systems

• linux•linux_kernel

  < 5.15

• netapp•active_iq_unified_manager

  na

• netapp•bootstrap_os

  na

• netapp•element_software

  na

• netapp•h300s_firmware

  na

• netapp•h410c_firmware

  na

• netapp•h410s_firmware

  na

• netapp•h500s_firmware

  na

• netapp•h700s_firmware

  na

• netapp•hci_management_node

  na

• netapp•solidfire

  na

• redhat•enterprise_linux

  7.0 | 8.0

References (4)

• https://bugzilla.redhat.com/show_bug.cgi?id=1999589
• https://github.com/torvalds/linux/commit/2287a51ba822384834dafc1c798453375d1107c7
• https://www.openwall.com/lists/oss-security/2021/09/01/4
• https://security.netapp.com/advisory/ntap-20221028-0003/