CVE-2026-64578

CVE-2026-64578 affects the Linux kernel ksmbd SMB2 handling. A compound (chained) SMB2 request could trigger a slab-out-of-bounds read when ksmbd_smb2_check_message() reads the StructureSize2 field at offset 64 without first ensuring the compound element is large enough. The vulnerable path occur...

EUVD-2026-53272

In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate compound request size before reading StructureSize2 When ksmbd validates a compound chained SMB2 request, ksmbdsmb2checkmessage reads pdu-StructureSize2 without first checking that the compound element is large...

CVE-2026-64389

A flaw was found in the Linux kernel's ksmbd component. A remote attacker could exploit a vulnerability in the NTLMv2 authentication process to modify a session key even when authentication fails. This bypasses security checks and could potentially lead to unauthorized access or session hijacking...

CVE-2026-64399

A flaw was found in ksmbd. This vulnerability allows a remote attacker to overwrite data on a shared file system due to insufficient permission checks in the FSCTLDUPLICATEEXTENTSTOFILE function. Even if a share is configured as read-only or a client has limited write attributes, an attacker can...

The vulnerability of the `ksmbd_kthread_fn()` function in the `fs/smb/server/transport_tcp.c` module, which is part of the SMB server support in Linux kernel, allows a hacker to gain unauthorized access to protected information.

The vulnerability of the ksmbdkthreadfn function in the fs/smb/server/transporttcp.c module of the SMB server support module in the Linux operating system involves the disclosure of confidential information. Exploiting this vulnerability could allow an attacker, acting remotely, to gain...

CVE-2026-64437

A flaw was found in the ksmbd component of the Linux kernel. This vulnerability allows an authenticated client using the Server Message Block SMB protocol to trigger a use-after-free error. By sending specific close and cancel requests, an attacker can cause the kernel to crash, leading to a deni...

CVE-2026-64393

A flaw was found in the Linux kernel's ksmbd component. This vulnerability allows a local attacker to escalate privileges by manipulating Server Message Block SMB2 SETINFO operations. The system incorrectly uses the ksmbd worker's credentials instead of the original user's credentials when...

CVE-2026-64395

A flaw was found in the Linux kernel's ksmbd component. This vulnerability allows an attacker with attribute access to a file to bypass security checks when duplicating file extents. By using the FSCTLDUPLICATEEXTENTSTOFILE function, an attacker can copy the contents of a source file to a...

SUSE CVE-2026-64393

In the Linux kernel, the following vulnerability has been resolved: ksmbd: run set info with opener credentials SMB2 SETINFO handlers call path-based VFS helpers after checking the access mask granted to the SMB handle. Those helpers perform their owner, inode permission and LSM checks using the...

SUSE CVE-2026-64397

In the Linux kernel, the following vulnerability has been resolved: ksmbd: serialize QUERYDIRECTORY requests per file smb2querydir stores a pointer to its stack-allocated private data in the ksmbdfile readdirdata. Concurrent QUERYDIRECTORY requests using the same file handle can overwrite this...

SUSE CVE-2026-64398

In the Linux kernel, the following vulnerability has been resolved: ksmbd: add a permission check for FSCTLSETZERODATA FSCTLSETZERODATA in smb2ioctl destroys file data via ksmbdvfszerodata - vfsfallocatePUNCHHOLE/ZERORANGE after checking only the share-level KSMBDTREECONNFLAGWRITABLE, with no...

SUSE CVE-2026-64399

In the Linux kernel, the following vulnerability has been resolved: ksmbd: add permission checks for FSCTLDUPLICATEEXTENTSTOFILE The FSCTLDUPLICATEEXTENTSTOFILE arm of smb2ioctl overwrites the destination file's data via vfsclonefilerange with neither the share-level KSMBDTREECONNFLAGWRITABLE che...

CVE-2026-64437

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free of a deferred filelock on SMB2CLOSE then SMB2CANCEL Commit f580d27e8928 "ksmbd: fix use-after-free of a deferred filelock on double SMB2CANCEL" made smb2cancel skip a work whose state is...

CVE-2026-64397

In the Linux kernel, the following vulnerability has been resolved: ksmbd: serialize QUERYDIRECTORY requests per file smb2querydir stores a pointer to its stack-allocated private data in the ksmbdfile readdirdata. Concurrent QUERYDIRECTORY requests using the same file handle can overwrite this...

CVE-2026-64398

In the Linux kernel, the following vulnerability has been resolved: ksmbd: add a permission check for FSCTLSETZERODATA FSCTLSETZERODATA in smb2ioctl destroys file data via ksmbdvfszerodata - vfsfallocatePUNCHHOLE/ZERORANGE after checking only the share-level KSMBDTREECONNFLAGWRITABLE, with no...

CVE-2026-64396

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix UAF of struct filelock in SMB2LOCK deferred-lock cancellation When a blocking byte-range lock request is deferred in the FILELOCKDEFERRED path, ksmbd registers the asynchronous work into the connection's asyncrequests...

CVE-2026-64400

In the Linux kernel, the following vulnerability has been resolved: ksmbd: prevent path traversal bypass by restricting caseless retry ksmbdvfspathlookup enforces LOOKUPBENEATH to restrict path resolution within the share root. When a crafted path attempts to escape the share boundary using...

CVE-2026-64399

In the Linux kernel, the following vulnerability has been resolved: ksmbd: add permission checks for FSCTLDUPLICATEEXTENTSTOFILE The FSCTLDUPLICATEEXTENTSTOFILE arm of smb2ioctl overwrites the destination file's data via vfsclonefilerange with neither the share-level KSMBDTREECONNFLAGWRITABLE che...

CVE-2026-64395

In the Linux kernel, the following vulnerability has been resolved: ksmbd: require source read access for duplicate extents FSCTLDUPLICATEEXTENTSTOFILE passes the source file directly to vfsclonefilerange or vfscopyfilerange without checking the SMB access mask granted to the source handle. A...

CVE-2026-64393

In the Linux kernel, the following vulnerability has been resolved: ksmbd: run set info with opener credentials SMB2 SETINFO handlers call path-based VFS helpers after checking the access mask granted to the SMB handle. Those helpers perform their owner, inode permission and LSM checks using the...