UBUNTU-CVE-2026-64257

In the Linux kernel, the following vulnerability has been resolved: smb: client: reject overlapping data areas in SMB2 responses Commit 53b7c271f06b "smb: client: restrict implied bcc0 exemption to responses without data area" restricted the implied bcc0 length exception to responses without a da...

CVE-2026-64386

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix queryinfo replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2queryinfoinit fails before the next send, cleanup retains the previous buffer type and...

UBUNTU-CVE-2026-64380

In the Linux kernel, the following vulnerability has been resolved: smb: client: harden POSIX SID length parsing posixinfosidsize reads sid1 to obtain the subauthority count, but its existing boundary check still accepts buffers with only one remaining byte. Require two bytes before reading sid1 ...

CVE-2026-64448

Summary (CVE-2026-64448): The Linux kernel fix addresses a SMB2 negotiation bug in CIFS/NTLM handling. A long-standing quirk in smb2_check_message() unconditionally granted a +1 length exemption for responses, even when a data area was present. This could cause the decoder to read past the receiv...

EUVD-2026-48792

In the Linux kernel, the following vulnerability has been resolved: smb: client: restrict implied bcc0 exemption to responses without data area smb2checkmessage has a long-standing quirk that accepts a response whose calculated length is one byte larger than the bytes actually received "server ca...

CVE-2026-64401 smb: client: resolve SWN tcon from live registrations

In the Linux kernel, the following vulnerability has been resolved: smb: client: resolve SWN tcon from live registrations cifsswnnotify looks up a witness registration by id under cifsswnregidrmutex, drops the mutex, and then uses the registration's cached tcon pointer. That pointer is not a...

CVE-2026-64388

In the Linux kernel, the following vulnerability has been resolved: smb/client: fix chown/chgrp with SMB3 POSIX Extensions Ownership chown and group chgrp modifications were being ignored when mounting with SMB3 POSIX Extensions unless CIFSMOUNTCIFSACL or CIFSMOUNTMODEFROMSID were also explicitly...

CVE-2026-64387 smb: client: fix query directory replay double-free

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix query directory replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2querydirectoryinit fails before the next send, cleanup retains the previous buffer...

CVE-2026-64386

CVE-2026-64386 : In the Linux kernel SMB client, a replayable error could free the prior response buffer when SMB2_query_info_init() fails before the next send, causing a double-free. The fix resets response bookkeeping before each attempt to prevent stale frees. Affected component is the SMB cli...

CVE-2026-64385

The CVE-2026-64385 entry relates to a Linux kernel SMB client double-free in SMB2_ioctl() replay. The underlying issue is a stale buffer being freed twice when an SMB2_ioctl_init() path fails before the next send; the fix resets response bookkeeping before each attempt to prevent the stale free. ...

EUVD-2026-48929

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2ioctl replay A response-bearing attempt can return a replayable error and free its response buffer. If SMB2ioctlinit fails before the next send, cleanup retains the previous buffer type and fre...

CVE-2026-64383

CVE-2026-64383 affects the Linux kernel’s SMB2 client path, specifically the SMB2_flush() replay handling. The issue arises when a replayable flush response is received and a retry fails before a replacement response is stored, causing a second free of the stale buffer due to persistent bookkeepi...

CVE-2026-64383

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2flush replay SMB2flush keeps its response buffer bookkeeping across replay attempts. If a replayable flush response is received and the retry then fails before cifssendrecv stores a replacement...

EUVD-2026-48927

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2flush replay SMB2flush keeps its response buffer bookkeeping across replay attempts. If a replayable flush response is received and the retry then fails before cifssendrecv stores a replacement...

CVE-2026-64381

The CVE-2026-64381 issue is in the Linux kernel SMB client code path used by receive_encrypted_standard()/receive encrypted standard(): a next_buffer is allocated before validating that the number of compound PDUs has not exceeded MAX_COMPOUND. If the limit check fails, the function returns early...

CVE-2026-64381 smb: client: Fix next buffer leak in receive_encrypted_standard()

In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix next buffer leak in receiveencryptedstandard receiveencryptedstandard allocates nextbuffer before checking whether the number of compound PDUs already reached MAXCOMPOUND. If the limit check fails, the function...

CVE-2026-64381 smb: client: Fix next buffer leak in receive_encrypted_standard()

In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix next buffer leak in receiveencryptedstandard receiveencryptedstandard allocates nextbuffer before checking whether the number of compound PDUs already reached MAXCOMPOUND. If the limit check fails, the function...

CVE-2026-64382

CVE-2026-64382 describes a Linux kernel SMB client-use-after-free issue in SMB2_open() replay handling. The vulnerability arises because a response-bearing SMB2_open attempt could return a replayable error and free its response buffer; if SMB2_open_init() fails before the next send, cleanup may f...

CVE-2026-64379

In the Linux kernel, the following vulnerability has been resolved: smb: client: mask server-provided mode to 07777 in modefromsid When modefromsid is active, parsedacl applies the server-provided subauth2 value from the NFS mode SID to cfmode without masking to 07777. Apply the correct masking,...

CVE-2026-64379

The CVE-2026-64379 issue affects the Linux kernel SMB client: when modefromsid is active, parse_dacl() could apply the server-provided NFS mode SID sub_auth[2] to cf_mode without masking to 07777. The root cause is missing masking in cf_mode; the fix applies the correct masking (07777) the same a...