# RHSA-2024:0012: firefox security update

RHSA-2024:0012, released January 2, 2024, fixes 11 CVEs in firefox (version 0:115.6.0-1.el8_9). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2024-0012
- Platform: Linux
- Released: Jan 2, 2024
- Priority: High (Closes CVE-2023-6856, high severity)
- CVEs: 11, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2024:0012

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [firefox](https://patchblox.com/security/data/product/linux/firefox.md) | RHEL 8 | 0:115.6.0-1.el8_9 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2023-6856](https://patchblox.com/security/data/cve/CVE-2023-6856.md) | High | Mozilla Firefox ESR and 5 others: The WebGL `DrawElementsInstanced` method was susceptible to a heap buffer overflow when used on systems… | 8.8 | 0.2063 |  |
| [CVE-2023-6858](https://patchblox.com/security/data/cve/CVE-2023-6858.md) | High | Mozilla Firefox ESR and 5 others: Out-of-bounds Write | 8.8 | 0.0154 |  |
| [CVE-2023-6861](https://patchblox.com/security/data/cve/CVE-2023-6861.md) | High | Mozilla Firefox ESR and 5 others: The `nsWindow::PickerOpen(void)` method was susceptible to a heap buffer overflow when running in headless… | 8.8 | 0.0141 |  |
| [CVE-2023-6864](https://patchblox.com/security/data/cve/CVE-2023-6864.md) | High | Mozilla Firefox ESR and 5 others: Memory safety bugs present in Firefox 120, Firefox ESR 115.5, and Thunderbird 115.5. | 8.8 | 0.0119 |  |
| [CVE-2023-6859](https://patchblox.com/security/data/cve/CVE-2023-6859.md) | High | Mozilla Firefox ESR and 5 others: A use-after-free condition affected TLS socket creation when under memory pressure. | 8.8 | 0.0109 |  |
| [CVE-2023-6863](https://patchblox.com/security/data/cve/CVE-2023-6863.md) | High | Mozilla Firefox ESR and 5 others: The `ShutdownObserver()` was susceptible to potentially undefined behavior due to its reliance on a dynamic… | 8.8 | 0.0104 |  |
| [CVE-2023-6862](https://patchblox.com/security/data/cve/CVE-2023-6862.md) | High | Mozilla Thunderbird and 1 other: A use-after-free was identified in the `nsDNSService::Init`. | 8.8 | 0.0095 |  |
| [CVE-2023-6865](https://patchblox.com/security/data/cve/CVE-2023-6865.md) | High | Mozilla Firefox ESR and 3 others: `EncryptingOutputStream` was susceptible to exposing uninitialized data. | 7.5 | 0.0089 |  |
| [CVE-2023-6860](https://patchblox.com/security/data/cve/CVE-2023-6860.md) | Routine | Mozilla Firefox ESR and 5 others: The `VideoBridge` allowed any content process to use textures produced by remote decoders. | 6.5 | 0.0096 |  |
| [CVE-2023-6867](https://patchblox.com/security/data/cve/CVE-2023-6867.md) | Routine | Mozilla Firefox ESR and 3 others: The timing of a button click causing a popup to disappear was approximately the same length as the anti-clickjacking… | 6.1 | 0.0068 |  |
| [CVE-2023-6857](https://patchblox.com/security/data/cve/CVE-2023-6857.md) | Routine | thunderbird: When resolving a symlink, a race may occur where the buffer passed to `readlink` may actually be smaller than necessary | 6.1 | 0.0067 |  |

---

Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.