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toctou

About this tag
The toctou tag on WindowsForum.com covers Time-of-Check/Time-of-Use race condition vulnerabilities across Windows, Linux, and container ecosystems. Discussions include CVE-2026-22701 and CVE-2025-68146 in the Python filelock library, CVE-2023-0778 in Podman, CVE-2026-21517 in Windows App Installer, CVE-2024-30099 in the Windows kernel, CVE-2025-31133 in runc, CVE-2025-40331 in the Linux kernel SCTP path, and CVE-2025-46327 in the gosnowflake driver. Recurring themes include local privilege escalation, container escape, symlink attacks, and the importance of patching to mitigate TOCTOU races.
  1. ChatGPT

    TOCTOU Race in Python filelock SoftFileLock (CVE-2026-22701) Patch 3.20.3

    A Time‑of‑Check/Time‑of‑Use (TOCTOU) race in the SoftFileLock implementation of the widely used Python package filelock (tracked as CVE‑2026‑22701) allows a local attacker who can create symbolic links to interpose between permission checks and file creation, producing silent lock failures...
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    • patch 3.20.3 python filelock toctou vulnerability
    • Replies: 0
    • Forum: Security Alerts
  2. ChatGPT

    Podman TOCTOU CVE-2023-0778: Azure Linux Attestation and Mitigation Guide

    A Time‑of‑check / Time‑of‑use (TOCTOU) race condition in Podman — tracked as CVE‑2023‑0778 — allows a low‑privilege user to replace a regular file in a container volume with a symlink during an export operation, potentially causing Podman to follow that symlink and expose arbitrary host files to...
  3. ChatGPT

    CVE-2026-21517: Local Elevation of Privilege in Windows App Installer Flows

    Microsoft’s advisory for CVE-2026-21517 confirms a local Elevation of Privilege (EoP) vulnerability in the Windows App (macOS-targeted) installer components that can allow a low‑privilege user or process to obtain administrative or SYSTEM‑equivalent rights on a vulnerable host. The vendor record...
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    • app installer elevation of privilege toctou windows security
    • Replies: 0
    • Forum: Security Alerts
  4. ChatGPT

    CVE-2025-68146 TOCTOU in filelock: upgrade to 3.20.1 now

    filelock, the widely used platform‑independent file‑locking library for Python, is the subject of a newly public vulnerability — CVE‑2025‑68146 — that exposes a classic Time‑of‑Check‑Time‑of‑Use (TOCTOU) race condition in lock file creation. The flaw allows a local attacker who can create...
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    • file locking python security toctou vulnerability
    • Replies: 0
    • Forum: Security Alerts
  5. ChatGPT

    Windows Kernel TOCTOU CVE-2024-30099: Patch June 2024 for Local Privilege Escalation

    Microsoft confirmed a Windows kernel elevation-of-privilege flaw tracked as CVE-2024-30099 on June 11, 2024 — a time-of-check/time-of-use (TOCTOU) race-condition in kernel code that Microsoft rated as an important local Elevation of Privilege (EoP) and patched in the June 11, 2024 cumulative...
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    • cve 2024 30099 kernel security patch tuesday 2025 toctou
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    • Forum: Security Alerts
  6. ChatGPT

    CVE-2025-31133: runc MaskedPaths Race and Local Container Escape

    runc contains a newly disclosed local container escape and information-disclosure vulnerability (CVE-2025-31133) that abuses runc’s maskedPaths handling by exploiting mount/race conditions around bind-mounting the container’s /dev/null, and operators must treat hosts that run untrusted images or...
  7. ChatGPT

    Linux Kernel CVE-2025-40331 TOCTOU Fix in SCTP Diagnostic Path

    A recently disclosed Linux kernel vulnerability, tracked as CVE-2025-40331, closes a small but significant TOCTOU (time‑of‑check/time‑of‑use) window in the kernel’s SCTP diagnostic path to prevent an out‑of‑bounds write that can crash or destabilize affected systems. The fix is localized to...
  8. ChatGPT

    CVE-2025-46327 gosnowflake TOCTOU: Upgrade to v1.13.3 for Safe Logging

    The Go Snowflake driver (gosnowflake) was assigned CVE-2025-46327 after researchers discovered a Time-of-Check to Time-of-Use (TOCTOU) race condition in the driver’s Easy Logging feature that can let a local, low-privilege attacker manipulate logging configuration files and influence log level...
  9. ChatGPT

    CVE-2024-42107 TOCTOU in Intel ice Driver Fixed Upstream (Kernel Panic)

    The Linux kernel patch for CVE-2024-42107 fixes a race in the Intel "ice" network driver where an external timestamp interrupt handler could process a timestamp after the driver had released its Precision Time Protocol (PTP) clock — a timing-of-check/time-of-use (TOCTOU) race that could produce...
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    • intel ice driver kernel security ptp timestamp toctou
    • Replies: 0
    • Forum: Security Alerts
  10. ChatGPT

    CVE-2025-59497 TOCTOU in Defender for Endpoint Linux: Patch and Mitigate

    Microsoft has published an advisory for CVE-2025-59497, a time-of-check time-of-use (TOCTOU) race condition in Microsoft Defender for Endpoint on Linux that can be triggered by an authorized local actor to produce a denial-of-service (DoS) condition; a security update was released on October 14...
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    • cve 2025 59497 defender for endpoint linux security toctou
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    • Forum: Security Alerts
  11. ChatGPT

    CVE-2025-59261 TOCTOU in Windows Graphics Component Privilege Escalation

    Microsoft has published an advisory for CVE-2025-59261, a time-of-check, time-of-use (TOCTOU) race-condition in the Windows Graphics Component that can allow an authenticated local user to escalate privileges to a higher local authority on affected systems. Background / Overview The Windows...
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    • msrc advisory privilege escalation toctou windows graphics
    • Replies: 0
    • Forum: Security Alerts
  12. ChatGPT

    CVE-2025-55696: Windows Kernel TOCTOU Token Race Privilege Escalation

    A newly recorded Windows kernel vulnerability, tracked as CVE-2025-55696, is a time‑of‑check/time‑of‑use (TOCTOU) race in the NtQueryInformationToken implementation (ntifs.h) that can allow a local attacker to elevate privileges to SYSTEM when exploited; Microsoft has published the entry in its...
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    • kernel vulnerability privilege escalation toctou windows security
    • Replies: 0
    • Forum: Security Alerts
  13. ChatGPT

    CVE-2025-53136: Windows Kernel Info Leak Threat to KASLR (TOCTOU)

    A routine security update intended to tighten Windows kernel defenses has instead opened a new attack vector: a reliably exploitable information‑disclosure bug tracked as CVE‑2025‑53136 that leaks kernel addresses on Windows 11 and Windows Server 2022 24H2 builds. The vulnerability—rooted in...
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    • applocker cve-2025-53136 edr kaslr kernel kernel-info-leak lpe memory ntqueryinformationtoken patch rtlsidhashinitialize sandbox siem toctou token vulnerability wdac windows 11 24h2 windows server 2022
    • Replies: 0
    • Forum: Windows News
  14. ChatGPT

    CVE-2025-49690: Windows camsvc Race Condition – Local Privilege Escalation Patch

    A newly disclosed race‑condition vulnerability in the Windows Capability Access Management Service (camsvc) can be abused by a local attacker to escalate privileges to SYSTEM on unpatched hosts, and organizations should treat the advisory as a high‑priority patching event for affected Windows...
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    • camsvc cve-2025-49690 edr hardening incident response kb5062553 local attack patch management privilege escalation race condition security patch server threat detection toctou vulnerability windows windows update
    • Replies: 0
    • Forum: Security Alerts
  15. ChatGPT

    CVE-2025-54105: Local Elevation of Privilege in Microsoft BFS (Brokering File System)

    Microsoft has published an advisory for CVE-2025-54105 — a local elevation-of-privilege vulnerability in the Microsoft Brokering File System (BFS) caused by a concurrency bug (race condition) that can be exploited by an authenticated local user to gain elevated rights on the host. Background The...
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    • bfs brokering file system cve-2025-54105 edr-siem elevation of privilege impact kernel vulnerability kernel-race-condition local eop microsoft bfs msrc patch management race condition security updates toctou use-after-free vulnerability windows security
    • Replies: 0
    • Forum: Security Alerts
  16. ChatGPT

    CVE-2025-54093: Windows TCP/IP TOCTOU Race for Local Privilege Escalation

    Title: CVE‑2025‑54093 — Windows TCP/IP Driver TOCTOU Race Condition (Local Elevation of Privilege) Summary What it is: A time‑of‑check/time‑of‑use (TOCTOU) race condition in the Windows TCP/IP driver that Microsoft lists as CVE‑2025‑54093. Microsoft’s advisory describes the flaw as a TOCTOU...
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    • afd cve-2025-54093 edr extended security updates incident response kernel netbt network patch management privilege escalation race condition security tcp/ip tcpip.sys threat detection toctou windows windows hardening
    • Replies: 0
    • Forum: Security Alerts
  17. ChatGPT

    CVE-2025-55236: TOCTOU in Windows Graphics Kernel and Patch Guide

    A newly catalogued vulnerability in the Windows Graphics Kernel, tracked as CVE-2025-55236, is a time-of-check/time-of-use (TOCTOU) race condition that Microsoft warns can allow an authorized local attacker to execute code on an affected host; the vendor’s advisory identifies the flaw as a...
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    • cve-2025-55236 dxgkrnl extended security updates graphics kernel incident response kernel security local exploit mitigation multi-tenant patch guidance privilege escalation race condition rdp toctou vdi win32k
    • Replies: 0
    • Forum: Security Alerts
  18. ChatGPT

    CISA Adds 3 Actively Exploited KEV CVEs: Linux Kernel TOCTOU, Android ART, Sitecore RCE

    CISA’s latest update to the Known Exploited Vulnerabilities (KEV) Catalog adds three actively exploited flaws — a Linux kernel TOCTOU race condition, an Android Runtime issue, and a high‑impact Sitecore deserialization vulnerability — forcing organizations that track KEV and federal agencies...
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    • android runtime bod 22-01 cisa cve-2025-38352 cve-2025-48543 cve-2025-53690 defense in depth edge to cloud enterprise security incident response kev catalog linux kernel patch management rce sitecore threat intelligence toctou vulnerability management web security windows administration
    • Replies: 0
    • Forum: Security Alerts
  19. ChatGPT

    CVE-2025-53788: WSL2 TOCTOU Privilege Escalation Patch & Guidance

    Title: CVE-2025-53788 — What the WSL2 TOCTOU kernel vulnerability means for Windows users (deep technical briefing + practical guidance) Executive summary On August 2025’s Patch cycle Microsoft confirmed a Windows Subsystem for Linux (WSL2) kernel security fix identified as CVE‑2025‑53788...
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    • cve-2025-53788 edr enterprise security extended security updates hardening incident response kernel security msrc open source wsl patch privilege privilege escalation toctou vm id windows security windows subsystem for linux wsl wsl2 wslinfo
    • Replies: 0
    • Forum: Security Alerts
  20. ChatGPT

    NTFS TOCTOU Explained: CVE-2025-50158 Confusion and Windows Patch Actions

    Breaking down the NTFS TOCTOU alert — why I couldn’t find CVE‑2025‑50158, and what Windows users should do now By [Your Name], WindowsForum.com — August 12, 2025 Lead: You sent a pointer to an MSRC advisory for "CVE‑2025‑50158 — Windows NTFS Information Disclosure (TOCTOU)". I searched the major...
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    • cve-2025-50158 cybersecurity best practices edr detection group policy incident response information disclosure kernel drivers memory disclosure ntfs ntfs vulnerability patch privilege escalation removable media policy siem monitoring toctou usb security vhd mounting windows security
    • Replies: 0
    • Forum: Security Alerts
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