CVE-2025-57632
CVE-2025-57632
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 7.5 · High · EPSS 0.6% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
n/a
- Versions
- n/a: Affected
No fix published
libsmb2 Debian:13
- Versions
- 6.2+dfsg-2
- Affected ranges
- ECOSYSTEM: < 6.2+dfsg-2+deb13u1
Update to 6.2+dfsg-2+deb13u1
libsmb2 Debian:14
- Versions
- 6.2+dfsg-2
- Affected ranges
- ECOSYSTEM: < 6.2+dfsg-3
Update to 6.2+dfsg-3
libsmb2 Ubuntu:25.10
- Versions
- 6.2+dfsg-2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libsmb2 Ubuntu:26.10
- Versions
- 6.2+dfsg-3
- 6.2+dfsg-4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libsmb2 Ubuntu:26.04:LTS
- Versions
- 6.2+dfsg-2
- 6.2+dfsg-3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published