linux: In the Linux kernel, the following vulnerability has been resolved: ksmbd: require source read access for duplicate...
CVE-2026-64395 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-64395, released July 26, 2026. It is not reported as exploited. Patch Radar priority: High.
In the Linux kernel, the following vulnerability has been resolved: ksmbd: require source read access for duplicate extents FSCTL_DUPLICATE_EXTENTS_TO_FILE passes the source file directly to vfs_clone_file_range() or vfs_copy_file_range() without checking the SMB access mask granted to the source handle. A handle opened with attribute access can consequently be used to copy file contents into an attacker-readable destination. Require FILE_READ_DATA on the source handle before either VFS operation, matching other ksmbd data-copy paths.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| linux · Debian 12.15 (bookworm) | 6.1.180-1 | DEBIAN-CVE-2026-64395 | Jul 26, 2026 |
| linux · Debian 13.5 (trixie) | 6.12.96-1 | DEBIAN-CVE-2026-64395 | Jul 26, 2026 |
| linux · Debian 14 | 7.1.4-1 | DEBIAN-CVE-2026-64395 | Jul 26, 2026 |
| linux-6.12 · Debian 12.15 (bookworm) | 6.12.100-1~deb12u1 | DEBIAN-CVE-2026-64395 | Jul 26, 2026 |
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