CVE-2025-21853 (GCVE-0-2025-21853)
Vulnerability from cvelistv5
Published
2025-03-12 09:42
Modified
2025-05-04 07:22
Severity ?
Summary
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/
References
Impacted products
Vendor Product Version
Linux Linux Version: fc9702273e2edb90400a34b3be76f7b08fa3344b
Version: fc9702273e2edb90400a34b3be76f7b08fa3344b
Version: fc9702273e2edb90400a34b3be76f7b08fa3344b
Version: fc9702273e2edb90400a34b3be76f7b08fa3344b
Version: fc9702273e2edb90400a34b3be76f7b08fa3344b
Version: fc9702273e2edb90400a34b3be76f7b08fa3344b
Version: fc9702273e2edb90400a34b3be76f7b08fa3344b
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  }
}


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