CVE-2026-64137

The CVE-2026-64137 issue affects the Linux kernel CIFS client (SWN netlink). The vulnerability arises because CIFS_GENL_CMD_SWN_NOTIFY and related SWN multicast group handling lack proper capability checks, allowing an unprivileged local process to send witness notifications or join the multicast...

CVE-2026-64137 smb: client: require net admin for CIFS SWN netlink

In the Linux kernel, the following vulnerability has been resolved: smb: client: require net admin for CIFS SWN netlink CIFSGENLCMDSWNNOTIFY is the userspace witness-notify command. The intended sender is the cifs.witness helper, but the generic-netlink operation currently has no capability flag,...

EUVD-2026-45793

In the Linux kernel, the following vulnerability has been resolved: cifs: Fix busy dentry used after unmounting Since commit 340cea84f691c "cifs: open files should not hold ref on superblock", cifs file only holds the dentry refcnt, the cifs file close workcfile-deferred could be executed after...

kernel: fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath

A flaw was found in the Linux kernel's CIFS Common Internet File System client. When the cifssanitizeprepath function processes specially crafted input, such as an empty string or a string containing only delimiters, it can attempt to read data beyond its allocated memory buffer. This out-of-boun...

kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions

A privilege escalation vulnerability was found in the Linux kernel's CIFS client implementation. This could allow a local attacker to impersonate other users, bypass authentication in SMB mount operations, and potentially gain unauthorized access to network file shares or escalate privileges...

Important: Red Hat Security Advisory: samba security update

An update for samba is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is...

kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions

A privilege escalation vulnerability was found in the Linux kernel's CIFS client implementation. This could allow a local attacker to impersonate other users, bypass authentication in SMB mount operations, and potentially gain unauthorized access to network file shares or escalate privileges...

kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions

A privilege escalation vulnerability was found in the Linux kernel's CIFS client implementation. This could allow a local attacker to impersonate other users, bypass authentication in SMB mount operations, and potentially gain unauthorized access to network file shares or escalate privileges...

kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions

A privilege escalation vulnerability was found in the Linux kernel's CIFS client implementation. This could allow a local attacker to impersonate other users, bypass authentication in SMB mount operations, and potentially gain unauthorized access to network file shares or escalate privileges...

ROS-20260608-73-0001

The vulnerability of the cifsgetspnegokey function in the cifs.upcall tool of the cifs-utils package in Linux kernel systems is related to the lack of authentication for the critical function. Exploiting this vulnerability can allow an attacker to elevate their privileges to root and execute...

smb: client: reject userspace cifs.spnego descriptions

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CVE-2026-41013 Tenant-controlled comma smuggles arbitrary CIFS mount options

Input validation bypass in SMB volume mount handling in CloudFoundry Foundation diego-release allows low-privileged CF space developer to inject arbitrary kernel CIFS mount options via bypassing the mount-option allowlist, enabling privilege escalation and security control bypass on multi-tenant...

UBUNTU-CVE-2026-46243

In the Linux kernel, the following vulnerability has been resolved: smb: client: reject userspace cifs.spnego descriptions cifs.spnego key descriptions contain authority-bearing fields such as pid, uid, creduid, and upcalltarget that cifs.upcall treats as kernel-originating inputs. However,...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: cifs: The xid leak in cifscopyfilerange has been fixed. If the file is used by swap, before returning -EOPNOTSUPP, the xid should be freed. Otherwise, the xid will be leaked...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: cifs: The xid leak in cifsflock has been fixed. If flock is not used, before returning -ENOLCK, the xid should be freed; otherwise, the xid will be leaked...

Astra Linux – Vulnerability in Linux 5.10, Linux

A denial-of-service DOS issue was detected in the smb2ioctlqueryinfo function of the Linux kernel, within the fs/cifs/smb2ops.c Common Internet File System. This issue arises due to an incorrect return value from the memdupuser function. This flaw allows a local, privileged attacker with...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: cifs: fix use-after-free bug in refreshcacheworker The UAF bug occurred because we were putting DFS root sessions in cifsumount while DFS cache refresher was being executed. Make DFS root sessions have same lifetime as DFS tcons ...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: cifs: A memory leak was fixed when using fscache. If the condition “index == nextcached” is encountered, a reference count of the struct page is leaked. This issue is fixed by using readaheadfolio, which handles the reference cou...

Astra Linux – Vulnerability found in Linux 5.15, Linux 6.1

A use-after-free flaw was discovered in the setupasyncwork function in the KSMBD implementation of the in-kernel Samba server and CIFS services in the Linux kernel. This issue could allow an attacker to crash the system by accessing freed resources...

Unity Linux 20.1050e Security Update: kernel (UTSA-2026-021544)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-021544 advisory. In the Linux kernel, the following vulnerability has been resolved: cifs: fix oops during encryption When running xfstests against Azure the following oops occurred ...