CVE-2026-89630 smb: client: restore the data_offset bound in is_valid_oplock_break()

In the Linux kernel, the following vulnerability has been resolved: smb: client: restore the dataoffset bound in isvalidoplockbreak Commit 83bfbd0bb902 "cifs: Remove the RFC1002 header from smbhdr" changed the quantity this bound is measured against. It used to be srv-totalread minus the 4-byte...

CVE-2026-89630 smb: client: restore the data_offset bound in is_valid_oplock_break()

In the Linux kernel, the following vulnerability has been resolved: smb: client: restore the dataoffset bound in isvalidoplockbreak Commit 83bfbd0bb902 "cifs: Remove the RFC1002 header from smbhdr" changed the quantity this bound is measured against. It used to be srv-totalread minus the 4-byte...

CVE-2026-89630

CVE-2026-89630 is a critical vulnerability in the Linux kernel's CIFS/SMB client . A regression introduced by commit 83bfbd0bb902 (which removed the RFC1002 header from smb_hdr) caused the data_offset bound check in is_valid_oplock_break() to evaluate to zero, effectively disabling the overflow g...

PT-2026-90347

In the Linux kernel, the following vulnerability has been resolved: smb: client: reject a tree connect response whose byte count is too small CIFSTCon bounds its strnlen over the byte area with the server's ByteCount minus two, which for ByteCount 0 or 1 goes negative as an int and converts to a...

PT-2026-90346

In the Linux kernel, the following vulnerability has been resolved: smb: client: restore the data offset bound in is valid oplock break Commit 83bfbd0bb902 "cifs: Remove the RFC1002 header from smb hdr" changed the quantity this bound is measured against. It used to be srv-total read minus the...

PT-2026-90350

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix ALIGN overflow in symlink data error context loop The check added by commit 7d9a7f1f96cd "smb/client: fix possible infinite loop and oob read in symlink data" compared the post-ALIGN length against the remaining...

PT-2026-90348

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix use-before-check of ReparseDataLength in reparse buf ptr reparse buf ptr reads buf-ReparseDataLength before checking that count covers the full fixed header: buf = struct reparse data buffer u8 io + off; len =...

AlmaLinux 9 : kernel (ALSA-2026:64808)

The remote AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:64808 advisory. kernel: can: bcm: add locking for bcmop runtime updates CVE-2025-38004 kernel: iouring/poll: fix signed comparison in iopollgetownership CVE-2026-52933...

PT-2026-90352

In the Linux kernel, the following vulnerability has been resolved: smb: client: clear ce-tgthint in free tgts When free tgts frees all structures in ce-tlist, ce-tgthint is left pointing to one of the freed cache dfs tgt structures. If ce-tgthint is not reset before it is used later, it results ...

PT-2026-90349

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix OOB read/write from unvalidated DataOffset in coalesce t2 coalesce t2 computes data pointers directly from server-supplied DataOffset fields with no validation against buffer bounds: data area of tgt = char...

Blackash-CVE-2025-33073

✨ CVE-2025-33073: Windows SMB RCE Vulnerability 🚨 🔥 High-Severity Authenticated Remote Code Execution 🔥 Improper Access Control in Windows SMB Client CWE-284 🛡️ Key Details at a Glance...

kernel: smb: client: fix double-free in SMB2_close() replay

A flaw was found in the Linux kernel's Server Message Block SMB client. A vulnerability exists in the SMB2close replay mechanism where a response buffer can be freed twice. This double-free condition can lead to memory corruption, potentially resulting in a denial of service or the execution of...

AlmaLinux 8 : kernel (ALSA-2026:66000)

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:66000 advisory. kernel: crypto: pcrypt - Fix handling of MAYBACKLOG requests CVE-2026-43493 kernel: netfilter: conntrack: remove sprintf usage CVE-2026-53002 kernel:...

windows-smb-vulnerability-framework-cve-2025-33073

Windows SMB クライアント脆弱性研究フレームワーク 著者: cyberseallll 作成日: 2025 概要 私は、Windows SMB クライアントの特権昇格の重大な脆弱性である CVE-2025-33073 を分析・理解するために、この研究フレームワークを開発しました。この実装は、脆弱性研究と制御されたテスト環境のための包括的なツールを提供します。 脆弱性の詳細 CVE-2025-33073 は、Windows SMB クライアントの実装に影響を与える、ネットワークからアクセス可能な特権昇格の脆弱性です。この脆弱性は、SMB...

cifswitch-check

cifswitch-check 一个用于检查 Linux 系统是否暴露于 CIFSwitch CVE-2026-46243 的 Shell 脚本——这是一个自 2007 年以来一直存在于 Linux 内核 CIFS/SMB 客户端中的本地权限提升漏洞。 可在裸机主机、虚拟机以及容器内运行。设计用于直接嵌入 CI/CD 管道。 背景 CIFSwitch 于 2026 年 5 月 28 日由安全研究员 Asim Manizada 披露。该漏洞将内核 cifs.spnego 密钥类型中缺失的输入验证与 cifs-utils 中拥有 root 权限的 cifs.upcall 辅助程序串联起来。...

Important: Red Hat Security Advisory: kernel security update

An update for kernel is now available for Red Hat Enterprise Linux 8. 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 available for each vulnerability from th...

kernel: smb: client: validate DFS referral PathConsumed

A flaw was found in the Linux kernel's Server Message Block SMB client. A remote attacker could send a specially crafted SMB response containing a malformed Distributed File System DFS referral. This could cause the PathConsumed value to exceed the search name length, leading to an out-of-bounds...

kernel security update

An update is available for kernel. This update affects Rocky Linux 9. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the CVE list The kernel packages contain the Linux kernel, the core of any Linux operating...

RLSA-2026:64808 Important: kernel security update

The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fixes: kernel: can: bcm: add locking for bcmop runtime updates CVE-2025-38004 kernel: iouring/poll: fix signed comparison in iopollgetownership CVE-2026-52933 kernel: netfilter: nat: use kfreercu to...

RLSA-2026:64770 Important: kernel-rt security update

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fixes: kernel: crypto: pcrypt - Fix handling of MAYBACKLOG requests CVE-2026-43493 kernel: netfilter: conntrack: remove sprintf usage...