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A use-after-free flaw was found in vcs_read in drivers/tty/vt/vc_screen.c in vc_screen in the Linux Kernel. This issue may allow an attacker with local user access to cause a system crash or leak internal kernel information.

CVE-2023-3567 is a use-after-free vulnerability identified in the Linux kernel's virtual console screen driver (vc_screen), specifically in the vcs_read function located in drivers/tty/vt/vc_screen.c. This flaw allows a local attacker with standard user privileges to trigger a use-after-free condition, which can lead to a kernel crash (denial of service) or potentially leak sensitive kernel memory contents. The vulnerability arises from improper handling of memory in the virtual console subsystem, where freed memory is accessed after release, causing undefined behavior. Exploitation requires local access but no elevated privileges or user interaction beyond executing code locally. The CVSS v3.1 base score is 7.1, reflecting high impact on confidentiality and availability, with low attack complexity and privileges required. While no public exploits are known, the vulnerability affects Red Hat Enterprise Linux 8 kernels and possibly other Linux distributions with similar kernel versions. The flaw could be leveraged by malicious insiders or attackers who have gained local access to escalate impact by causing system instability or extracting kernel memory data. Red Hat and the Linux community are expected to release patches to address this issue, and users should apply updates promptly to mitigate risk.

Detailed information about CVE-2023-3567: Use After Free in Red Hat Red Hat Enterprise Linux 8 affecting Red Hat Red Hat Enterprise Linux 8. Get real-time updat

CVE-2023-3567: Use After Free in Red Hat Red Hat Enterprise Linux 8 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2023-3567: Use After Free in Red Hat Red Hat Enterprise Linux 8

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