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CVE-2025-21695— platform/x86: dell-uart-backlight: fix serdev race

Quick assessment

Affected
Linux Linux
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.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于空指针取消引用。

AI Predicted 5.5 Difficulty: Hard EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux 484bae9e4d6acb5eec39e1ea47f9aa43f11b154d< d3a24d923333f75aaece9acb051d676edc0afb75 affected
484bae9e4d6acb5eec39e1ea47f9aa43f11b154d< 1b2128aa2d45ab20b22548dcf4b48906298ca7fd affected
6.10 affected
< 6.10 unaffected
6.12.11≤ 6.12.* unaffected
6.13≤ * unaffected
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I. Basic Information for CVE-2025-21695

Vulnerability Information
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Vulnerability Title
platform/x86: dell-uart-backlight: fix serdev race
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: platform/x86: dell-uart-backlight: fix serdev race The dell_uart_bl_serdev_probe() function calls devm_serdev_device_open() before setting the client ops via serdev_device_set_client_ops(). This ordering can trigger a NULL pointer dereference in the serdev controller's receive_buf handler, as it assumes serdev->ops is valid when SERPORT_ACTIVE is set. This is similar to the issue fixed in commit 5e700b384ec1 ("platform/chrome: cros_ec_uart: properly fix race condition") where devm_serdev_device_open() was called before fully initializing the device. Fix the race by ensuring client ops are set before enabling the port via devm_serdev_device_open(). Note, serdev_device_set_baudrate() and serdev_device_set_flow_control() calls should be after the devm_serdev_device_open() call.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 484bae9e4d6acb5eec39e1ea47f9aa43f11b154d ~ d3a24d923333f75aaece9acb051d676edc0afb75 -
Linux Linux 6.10 -

II. Public POCs for CVE-2025-21695

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2025-21695

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Patches & Fixes for CVE-2025-21695 (2)

Same Patch Batch · Linux · 2025-02-12 · 7 CVEs total

CVE-2025-21697 7.8 HIGH drm/v3d: Ensure job pointer is set to NULL after job completion
CVE-2025-21699 7.8 HIGH gfs2: Truncate address space when flipping GFS2_DIF_JDATA flag
CVE-2024-57952 7.1 HIGH Revert "libfs: fix infinite directory reads for offset dir"
CVE-2024-57951 hrtimers: Handle CPU state correctly on hotplug
CVE-2025-21694 fs/proc: fix softlockup in __read_vmcore (part 2)
CVE-2025-21696 mm: clear uffd-wp PTE/PMD state on mremap()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21695

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