PT-2021-4755 · Linux+1 · Linux Kernel+1

Cornelia Huck · Published 2021-08-11 · Updated 2023-08-14 · CVE-2021-3736

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A memory leak problem was found in the mbochs ioctl function in the samples/vfio-mdev/mbochs.c file of the Linux kernel, related to Virtual Function I/O (VFIO) Mediated devices. This issue could allow a local attacker to leak internal kernel information. The vulnerability is associated with input-output errors in VFIO, which could enable an attacker to access protected information.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Information Disclosure

Memory Leak

Weakness Enumeration

CWE-200

CWE-401

Related Identifiers

ALT-PU-2021-3330

ALT-PU-2021-3331

ALT-PU-2021-3357

ALT-PU-2021-3563

ALT-PU-2021-3573

ALT-PU-2022-1240

ALT-PU-2022-1419

ALT-PU-2022-1421

ALT-PU-2023-1814

ALT-PU-2023-4894

BDU:2021-05472

CVE-2021-3736

Affected Products

Alt Linux

Linux Kernel

References · 14

• https://github.com/torvalds/linux/commit/de5494af4815a4c9328536c72741229b7de88e7f · Patch
• https://security-tracker.debian.org/tracker/CVE-2021-3736 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-3736 · Security Note
• https://bdu.fstec.ru/vul/2021-05472 · Security Note
• https://cve.org/CVERecord?id=CVE-2021-3736 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-3736 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-3736 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-3736 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-3736 · Vendor Advisory
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3736 · Note
• https://bugzilla.redhat.com/show_bug.cgi?id=1995570 · Note
• https://access.redhat.com/security/cve/CVE-2021-3736 · Note
• https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.6 · Note
• https://access.redhat.com/security/cve/cve-2021-3736 · Note