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[ CVE-2024-1086 · Published 31 Jan 2024 ]

Linux Kernel Use-After-Free Vulnerability

Exploited · CISA KEV CVSS 7.8 EPSS 28%Fix available

[ Why it matters ]Priority signals

  • Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2024-05-30
  • Known to be used in ransomware campaigns
  • EPSS: 28% chance of exploitation in the next 30 days (higher than 98% of CVEs)

[ Description ]Official description

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. The nft_verdict_init() function allows positive values as drop error within the hook verdict, and hence the nf_hook_slow() function can cause a double free vulnerability when NF_DROP is issued with a drop error which resembles NF_ACCEPT. We recommend upgrading past commit f342de4e2f33e0e39165d8639387aa6c19dff660.

CISA: Linux kernel contains a use-after-free vulnerability in the netfilter: nf_tables component that allows an attacker to achieve local privilege escalation.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 20 Jun 2024): Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

[ References ]References