libsmb2: libsmb2 6.2+ is vulnerable to Buffer Overflow
CVE-2025-57632 is fixed in libsmb2 on 1 platform, first by DEBIAN-CVE-2025-57632, released September 25, 2025. It is not reported as exploited. Patch Radar priority: High.
libsmb2 6.2+ is vulnerable to Buffer Overflow. When processing SMB2 chained PDUs (NextCommand), libsmb2 repeatedly calls smb2_add_iovector() to append to a fixed-size iovec array without checking the upper bound of v->niov (SMB2_MAX_VECTORS=256). An attacker can craft responses with many chained PDUs to overflow v->niov and perform heap out-of-bounds writes, causing memory corruption, crashes, and potentially arbitrary code execution. The SMB2_OPLOCK_BREAK path bypasses message ID validation.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libsmb2 · Debian 13.5 (trixie) | 6.2+dfsg-2+deb13u1 | DEBIAN-CVE-2025-57632 | Sep 25, 2025 |
| libsmb2 · Debian 14 | 6.2+dfsg-3 | DEBIAN-CVE-2025-57632 | Sep 25, 2025 |
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