Shodan
Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2025-21853

In the Linux kernel, the following vulnerability has been resolved: bpf: avoid holding freeze_mutex during mmap operation We use map->freeze_mutex to prevent races between map_freeze() and memory mapping BPF map contents with writable permissions. The way we naively do this means we'll hold freeze_mutex for entire duration of all the mm and VMA manipulations, which is completely unnecessary. This can potentially also lead to deadlocks, as reported by syzbot in [0]. So, instead, hold freeze_mutex only during writeability checks, bump (proactively) "write active" count for the map, unlock the mutex and proceed with mmap logic. And only if something went wrong during mmap logic, then undo that "write active" counter increment. [0] https://lore.kernel.org/bpf/678dcbc9.050a0220.303755.0066.GAE@google.com/
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 20.5%
CVSS Severity
CVSS v3 Score 5.5
Products affected by CVE-2025-21853


Products
Pricing
Contact Us

Shodan ® - All rights reserved