CVE-2020-36694

kernel: netfilter: use-after-free in the packet processing context

Published May 21, 2023 CVSS 3.1 · 6.7 Medium EPSS < 1% KEV · Not listed
Description
An issue was discovered in netfilter in the Linux kernel before 5.10. There can be a use-after-free in the packet processing context, because the per-CPU sequence count is mishandled during concurrent iptables rules replacement. This could be exploited with the CAP_NET_ADMIN capability in an unprivileged namespace. NOTE: cc00bca was reverted in 5.12.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2020-24136 An issue was discovered in netfilter in the Linux kernel before 5.10. There can be a use-after-free in the packet processing context, because the per-CPU sequence count is mishandled during concurrent iptables rules replacement. This could be exploited with the CAP_NET_ADMIN capability in an unprivileged namespace. NOTE: cc00bca was reverted in 5.12.
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Jan 31, 2025, 5:46 PM
Reserved
May 21, 2023, 12:00 AM
Status
Modified
Published
May 21, 2023, 11:15 PM
Modified
Jun 17, 2026, 3:15 AM
Severity
Moderate
Public date
May 22, 2023, 6:30 AM