Tracker / CVE-2025-37858
CVE-2025-37858
In the Linux kernel, the following vulnerability has been resolved: fs/jfs: Prevent integer overflow in AG size calculation The JFS filesystem calculates allocation group (AG) size using 1 << l2agsize in dbExtendFS(). When l2agsize exceeds 31 (possible with >2TB aggregates on 32-bit systems), this 32-bit shift operation causes undefined behavior and improper AG sizing. On 32-bit architectures: - Left-shifting 1 by 32+ bits results in 0 due to integer overflow - This creates invalid AG sizes (0 or garbage values) in sbi->bmap->db_agsize - Subsequent block allocations would reference invalid AG structures - Could lead to: - Filesystem corruption during extend operations - Kernel crashes due to invalid memory accesses - Security vulnerabilities via malformed on-disk structures Fix by casting to s64 before shifting: bmp->db_agsize = (s64)1 << l2agsize; This ensures 64-bit arithmetic even on 32-bit architectures. The cast matches the data type of db_agsize (s64) and follows similar patterns in JFS block calculation code. Found by Linux Verification Center (linuxtesting.org) with SVACE.
Prodotti e versioni affette
| debian | debian_linux |
|---|---|
| linux | linux_kernel · … → 5.4.293 |
| linux | linux_kernel · 5.11 → 5.15.181 |
| linux | linux_kernel · 5.16 → 6.1.135 |
| linux | linux_kernel · 5.5 → 5.10.237 |
| linux | linux_kernel · 6.13 → 6.13.12 |
| linux | linux_kernel · 6.14 → 6.14.3 |
| linux | linux_kernel · 6.2 → 6.6.88 |
| linux | linux_kernel · 6.7 → 6.12.24 |