CVE-2024-27019: 
Linux Kernel vulnerability analysis and mitigation

CVE-2024-27019 is a vulnerability discovered in the Linux kernel's netfilter component, specifically in the nftables subsystem. The issue involves a potential data race condition in the _nftobjtype_get() function. The vulnerability was disclosed on May 1, 2024, affecting Linux kernel versions from 4.10 up to versions before 5.15.157, 6.1.88, 6.6.29, and 6.8.8 (NVD).

The vulnerability stems from a synchronization issue where nftunregisterobj() can run concurrently with _nftobjtypeget(), without proper protection when iterating over the nftablesobjects list. This creates a potential data race condition when accessing the list entries. The issue has been assigned a CVSS v3.1 Base Score of 4.7 (Medium) with the vector string CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N (NVD).

The vulnerability could lead to a data race condition in the Linux kernel's netfilter subsystem. While the full impact is not explicitly detailed in the sources, the CVSS score indicates potential high confidentiality impact under specific conditions, though no integrity or availability impacts are noted (NVD).

The vulnerability has been fixed by implementing proper RCU (Read-Copy-Update) protection mechanisms. The fix includes using listforeachentryrcu() to iterate over nftablesobjects list in _nftobjtypeget(), and adding rcureadlock() in the caller nftobjtype_get() to protect the entire type query process. The fix has been incorporated into various Linux kernel versions through patches (Kernel Patch).