ZDI-CAN-33549

The Bug · Check · Exploit · Detection · Impact · Write-up ---...

Two CVSS 9.0 Linux KSMBD RCE Flaws Disclosed on Public Mailing Lists Before Kernel Fixes

Linux servers running KSMBD, the kernel's built-in SMB server, are exposed to two publicly reported remote code execution flaws rated 9.0 by Trend Micro's Zero Day Initiative, with no fix yet in the mainline kernel. One of them, ZDI-CAN-33774, can be triggered before any network authentication. T...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: smb: server: splitting ksmbdrdmastoplistening from ksmbdrdmaDestroy We cannot call destroyworkqueuesmbdirectwq; before stopsessions! Otherwise, existing connections will attempt to use smbdirectwq as a NULL pointer...

Astra Linux – Vulnerability found in Linux 6.1, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: ksmbd: smbdirect: validate the dataoffset and datalength fields of the smbdirectdatatransfer structure. If the dataoffset and datalength fields of the smbdirectdatatransfer structure are invalid, an out-of-bounds issue may occur...

Astra Linux – vulnerability in linux-5.15

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix signededness bug in smbdirectpreparenegotiation smbdirectpreparenegotiation casts an unsigned u32 value from sp-maxrecvsize and req-preferredsendsize to a signed int before computing mintint, .... A maliciously provide...

CVE-2026-90171

A flaw was found in the SMB Direct smbdirect component of the Linux kernel. This vulnerability arises from an improper handling of child sockets during the shutdown process, where memory is released prematurely while still in use. A remote attacker could potentially exploit this timing issue to...

Astra Linux – Vulnerability in Linux 5.10, Linux, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: cifs: Fixed the issue where the smbd connection was lost and destroyed when the MR allocation failed. If the MR allocation fails, the smbdDestroy function will return NULL, causing the connection information to be leaked. We need...

ANT-2026-M8R2AWBV · linux · other

other high Severity Claude high · Security research firm - · Maintainer - Discovered by Claude Mythos Preview REPORT Anthropic's analysis of this finding, sealed at approval. ANT-2026-M8R2AWBV: ksmbd SMB-Direct: pre-auth remote heap overflow via preferredsendsize signedness mintint Pre-auth remot...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: smb: server: The senddone handler now handles completion without using IBSENDSIGNALED. With smbdirectsendbatch, we likely have requests that do not include IBSENDSIGNALED. These requests will be destroyed during the final request...

EUVD-2026-27748

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix signededness bug in smbdirectpreparenegotiation smbdirectpreparenegotiation casts an unsigned u32 value from sp-maxrecvsize and req-preferredsendsize to a signed int before computing mintint, .... A maliciously provide...

CVE-2026-43185

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix signededness bug in smbdirectpreparenegotiation smbdirectpreparenegotiation casts an unsigned u32 value from sp-maxrecvsize and req-preferredsendsize to a signed int before computing mintint, .... A maliciously provide...

CVE-2026-43185 ksmbd: fix signededness bug in smb_direct_prepare_negotiation()

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix signededness bug in smbdirectpreparenegotiation smbdirectpreparenegotiation casts an unsigned u32 value from sp-maxrecvsize and req-preferredsendsize to a signed int before computing mintint, .... A maliciously provide...

DEBIAN-CVE-2026-31535

In the Linux kernel, the following vulnerability has been resolved: smb: client: make use of smbdirectsocket.recvio.credits.available The logic off managing recv credits by counting posted recvio and granted credits is racy. That's because the peer might already consumed a credit, but between...

CVE-2026-31539

In the Linux kernel, the following vulnerability has been resolved: smb: smbdirect: introduce smbdirectsocket.recvio.credits.available The logic off managing recv credits by counting posted recvio and granted credits is racy. That's because the peer might already consumed a credit, but between...

CVE-2026-31534

Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority...

CVE-2026-31608 smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()

In the Linux kernel, the following vulnerability has been resolved: smb: server: avoid double-free in smbdirectfreesendmsg after smbdirectflushsendlist smbdirectflushsendlist already calls smbdirectfreesendmsg, so we should not call it again after postsendmsg moved it to the batch list...

CVE-2026-31608

In the Linux kernel, the following vulnerability has been resolved: smb: server: avoid double-free in smbdirectfreesendmsg after smbdirectflushsendlist smbdirectflushsendlist already calls smbdirectfreesendmsg, so we should not call it again after postsendmsg moved it to the batch list...

EUVD-2026-25501

In the Linux kernel, the following vulnerability has been resolved: smb: server: avoid double-free in smbdirectfreesendmsg after smbdirectflushsendlist smbdirectflushsendlist already calls smbdirectfreesendmsg, so we should not call it again after postsendmsg moved it to the batch list...

CVE-2026-31539 smb: smbdirect: introduce smbdirect_socket.recv_io.credits.available

In the Linux kernel, the following vulnerability has been resolved: smb: smbdirect: introduce smbdirectsocket.recvio.credits.available The logic off managing recv credits by counting posted recvio and granted credits is racy. That's because the peer might already consumed a credit, but between...

CVE-2026-31539

In the Linux kernel, the following vulnerability has been resolved: smb: smbdirect: introduce smbdirectsocket.recvio.credits.available The logic off managing recv credits by counting posted recvio and granted credits is racy. That's because the peer might already consumed a credit, but between...