Описание
Use-after-free in the Layout: Positioned component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Use-after-free in the Layout: Positioned component
Отчет
Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Меры по смягчению последствий
--- CME Mitigation Guidance (2026-11-03) --- Disclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure. The highest-value action is to isolate browser rendering processes and prevent memory corruption in the Layout: Positioned component when processing untrusted layout structures: upgrade to Firefox 159, Firefox ESR 115.44, and Firefox ESR 153.6 (or the corresponding fixed Red Hat builds), which resolves a use-after-free memory safety defect in the Layout: Positioned component, closing rendering crafted HTML/CSS content with positioned layout elements. Until patched, this is a concern on clients rendering untrusted web content or emails across all supported platforms, so restrict user interaction with untrusted or compromised web pages and email messages in affected client software. As a compensating measure, maintain Address Space Layout Randomization to randomize browser process memory layout and hinder reliable code execution. These controls limit blast radius and contain exploitation, but they do not fix the underlying use-after-free defect — apply the upstream patch to fully remediate. Highest-impact CME: CME-101 ASLR (Address Space Layout Randomization) (medium)
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 10 | firefox | Affected | ||
| Red Hat Enterprise Linux 10 | rhel10/firefox-flatpak | Affected | ||
| Red Hat Enterprise Linux 10 | rhel10/thunderbird-flatpak | Affected | ||
| Red Hat Enterprise Linux 10 | thunderbird | Affected | ||
| Red Hat Enterprise Linux 6 | firefox | Out of support scope | ||
| Red Hat Enterprise Linux 6 | thunderbird | Out of support scope | ||
| Red Hat Enterprise Linux 7 | firefox | Affected | ||
| Red Hat Enterprise Linux 7 | thunderbird | Out of support scope | ||
| Red Hat Enterprise Linux 8 | firefox | Affected | ||
| Red Hat Enterprise Linux 8 | thunderbird | Affected |
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Дополнительная информация
Статус:
EPSS
7.5 High
CVSS3
Связанные уязвимости
Use-after-free in the Layout: Positioned component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Use-after-free in the Layout: Positioned component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Use-after-free in the Layout: Positioned component. This vulnerability ...
Use-after-free in the Layout: Positioned component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, and Firefox ESR 153.6.
EPSS
7.5 High
CVSS3