CVE-2025-21695
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2025-21695
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21695.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-21695
- Downstream
- Published
- 2025-02-12T13:27:54.344Z
- Modified
- 2025-11-20T07:43:29.414756Z
- Severity
-
- 4.7 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- platform/x86: dell-uart-backlight: fix serdev race
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
platform/x86: dell-uart-backlight: fix serdev race
The delluartblserdevprobe() function calls devmserdevdeviceopen() before setting the client ops via serdevdevicesetclientops(). This ordering can trigger a NULL pointer dereference in the serdev controller's receivebuf 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: crosecuart: properly fix race condition") where devmserdevdevice_open() was called before fully initializing the device.
Fix the race by ensuring client ops are set before enabling the port via devmserdevdevice_open().
Note, serdevdevicesetbaudrate() and serdevdevicesetflowcontrol() calls should be after the devmserdevdeviceopen() call.
- References
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced484bae9e4d6acb5eec39e1ea47f9aa43f11b154dFixedd3a24d923333f75aaece9acb051d676edc0afb75
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced484bae9e4d6acb5eec39e1ea47f9aa43f11b154dFixed1b2128aa2d45ab20b22548dcf4b48906298ca7fd
Affected versions
v6.*
v6.10
v6.10-rc1
v6.10-rc2
v6.10-rc3
v6.10-rc4
v6.10-rc5
v6.10-rc6
v6.10-rc7
v6.11
v6.11-rc1
v6.11-rc2
v6.11-rc3
v6.11-rc4
v6.11-rc5
v6.11-rc6
v6.11-rc7
v6.12
v6.12-rc1
v6.12-rc2
v6.12-rc3
v6.12-rc4
v6.12-rc5
v6.12-rc6
v6.12-rc7
v6.12.1
v6.12.10
v6.12.2
v6.12.3
v6.12.4
v6.12.5
v6.12.6
v6.12.7
v6.12.8
v6.12.9
v6.13-rc1
v6.9
v6.9-rc2
v6.9-rc3
v6.9-rc4
v6.9-rc5
v6.9-rc6
v6.9-rc7
Database specific
vanir_signatures
[
{
"id": "CVE-2025-21695-2ce68b85",
"signature_version": "v1",
"digest": {
"threshold": 0.9,
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},
"deprecated": false,
"signature_type": "Line",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@1b2128aa2d45ab20b22548dcf4b48906298ca7fd",
"target": {
"file": "drivers/platform/x86/dell/dell-uart-backlight.c"
}
},
{
"id": "CVE-2025-21695-2e464b74",
"signature_version": "v1",
"digest": {
"length": 1335.0,
"function_hash": "116565561086963202799076191708748943682"
},
"deprecated": false,
"signature_type": "Function",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@d3a24d923333f75aaece9acb051d676edc0afb75",
"target": {
"file": "drivers/platform/x86/dell/dell-uart-backlight.c",
"function": "dell_uart_bl_serdev_probe"
}
},
{
"id": "CVE-2025-21695-a5de795c",
"signature_version": "v1",
"digest": {
"threshold": 0.9,
"line_hashes": [
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"signature_type": "Line",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@d3a24d923333f75aaece9acb051d676edc0afb75",
"target": {
"file": "drivers/platform/x86/dell/dell-uart-backlight.c"
}
},
{
"id": "CVE-2025-21695-b21e9c60",
"signature_version": "v1",
"digest": {
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"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@1b2128aa2d45ab20b22548dcf4b48906298ca7fd",
"target": {
"file": "drivers/platform/x86/dell/dell-uart-backlight.c",
"function": "dell_uart_bl_serdev_probe"
}
}
]