Linux kernel F2FS NULL pointer dereference in mount-time truncation path (f2fs_disable_checkpoint/f2fs_gc)
A Linux kernel F2FS bug (fixed upstream) can trigger a NULL pointer dereference during a mount-time code path involving checkpoint disablement and garbage collection. Specifically, during mount the sequence f2fs_fill_super() → f2fs_disable_checkpoint() → f2fs_gc() → f2fs_iget() → f2fs_truncate() can reach fscrypt_set_bio_crypt_ctx() via f2fs_do_truncate_blocks()/truncate_partial_data_page(), but inode->i_crypt_info is not initialized in this path, leading to a NULL dereference. The fix relocates truncation of preallocated blocks to f2fs_file_open(), after fscrypt_file_open(), ensuring the encryption context is initialized before use.
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Recent activity
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A critical Linux kernel (Android kernel) elevation-of-privilege vulnerability in the Flash-Friendly File System (F2FS) enabling local privilege escalation.
Android Kernel component privilege escalation vulnerability.
Android Kernel component privilege escalation vulnerability.
A critical elevation-of-privilege vulnerability in the Android/Linux kernel's F2FS component.
The version that knows your environment.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.