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CVE-2026-76925— Flatpak: flatpak: toctou race condition allows symlink redirection

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Flatpak 中发现了一个缺陷。 组件中存在一个“检查时到使用时”（TOCTOU）竞态条件。该漏洞的原因是，在 函数中，具有特权的 操作在 OSTree 仓库验证之前执行。攻击者可以利用这一时间窗口，将符号链接重定向到任意文件，从而可能导致未经授权的文件操作或信息泄露。

CVSS 5.8 · Medium
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I. Basic Information for CVE-2026-76925

Vulnerability Information
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Vulnerability Title
Flatpak: flatpak: toctou race condition allows symlink redirection
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in Flatpak. A Time-of-check to time-of-use (TOCTOU) race condition exists in the `org.freedesktop.Flatpak.SystemHelper` component. This vulnerability occurs because a privileged `chmod` operation executes before the OSTree repository validation within the `Deploy()` function. An attacker can exploit this timing window to redirect symlinks to arbitrary files, potentially leading to unauthorized file manipulation or information disclosure.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-76925

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III. Intelligence Information for CVE-2026-76925

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Vendor Advisories for CVE-2026-76925 (1)

Other References for CVE-2026-76925 (1)

Same Patch Batch · Red Hat · 2026-09-04 · 6 CVEs total

CVE-2026-85197 7.6 HIGH Libsoup: libsoup: heap use-after-free in libsoup http/2 client on_data_read() via goaway d
CVE-2026-81665 7.5 HIGH Corosync: corosync: heap-based buffer overflow in totempg assembly buffer during fragmente
CVE-2026-81666 6.5 MEDIUM Corosync: corosync: integer overflow in check_memb_commit_token_sanity may bypass message
CVE-2026-85769 6.5 MEDIUM Libtpms: libtpms: heap out-of-bounds read in tpm2 state unmarshalling via unchecked block_
CVE-2026-85534 5.9 MEDIUM Libsoup: libsoup: http/2 client crash in on_data_source_read_callback when settings initia

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-367

V. Comments for CVE-2026-76925

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