Out-of-bounds Write Affecting kernel-rt-debug-kvm package, versions <0:4.18.0-193.60.2.rt13.112.el8_2


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.19% (59th percentile)

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  • Snyk IDSNYK-RHEL8-KERNELRTDEBUGKVM-3954520
  • published26 Jul 2021
  • disclosed20 Jul 2021

Introduced: 20 Jul 2021

CVE-2021-33909  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade RHEL:8 kernel-rt-debug-kvm to version 0:4.18.0-193.60.2.rt13.112.el8_2 or higher.
This issue was patched in RHSA-2021:2719.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-kvm package and not the kernel-rt-debug-kvm package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05.

References

CVSS Scores

version 3.1