Loading HuntDB...
Hunt
Vulnerability Intelligence by wss.sh
Home Daily Briefings High Impact CVEs Recent Exploits KEV Catalog GitHub Advisories Latest Updates Security News
Sign In Sign Up

CVE-2020-36787

UNKNOWN
Published 2024-02-28T08:13:07.275Z
Actions:

Expert Analysis

Professional remediation guidance

Get tailored security recommendations from our analyst team for CVE-2020-36787. We'll provide specific mitigation strategies based on your environment and risk profile.

No CVSS data available

Description

In the Linux kernel, the following vulnerability has been resolved:

media: aspeed: fix clock handling logic

Video engine uses eclk and vclk for its clock sources and its reset
control is coupled with eclk so the current clock enabling sequence works
like below.

Enable eclk
De-assert Video Engine reset
10ms delay
Enable vclk

It introduces improper reset on the Video Engine hardware and eventually
the hardware generates unexpected DMA memory transfers that can corrupt
memory region in random and sporadic patterns. This issue is observed
very rarely on some specific AST2500 SoCs but it causes a critical
kernel panic with making a various shape of signature so it's extremely
hard to debug. Moreover, the issue is observed even when the video
engine is not actively used because udevd turns on the video engine
hardware for a short time to make a query in every boot.

To fix this issue, this commit changes the clock handling logic to make
the reset de-assertion triggered after enabling both eclk and vclk. Also,
it adds clk_unprepare call for a case when probe fails.

clk: ast2600: fix reset settings for eclk and vclk
Video engine reset setting should be coupled with eclk to match it
with the setting for previous Aspeed SoCs which is defined in
clk-aspeed.c since all Aspeed SoCs are sharing a single video engine
driver. Also, reset bit 6 is defined as 'Video Engine' reset in
datasheet so it should be de-asserted when eclk is enabled. This
commit fixes the setting.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

Linux

Linux

Affected Versions:

d2b4387f3bdf016e266d23cf657465f557721488 d2b4387f3bdf016e266d23cf657465f557721488 d2b4387f3bdf016e266d23cf657465f557721488 d2b4387f3bdf016e266d23cf657465f557721488 d2b4387f3bdf016e266d23cf657465f557721488
Linux

Linux

Affected Versions:

5.0 0 5.4.119 5.10.37 5.11.21 5.12.4 5.13

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed MODERATE

GHSA-9hx5-6xv8-6w7c

Advisory Details

In the Linux kernel, the following vulnerability has been resolved: media: aspeed: fix clock handling logic Video engine uses eclk and vclk for its clock sources and its reset control is coupled with eclk so the current clock enabling sequence works like below. Enable eclk De-assert Video Engine reset 10ms delay Enable vclk It introduces improper reset on the Video Engine hardware and eventually the hardware generates unexpected DMA memory transfers that can corrupt memory region in random and sporadic patterns. This issue is observed very rarely on some specific AST2500 SoCs but it causes a critical kernel panic with making a various shape of signature so it's extremely hard to debug. Moreover, the issue is observed even when the video engine is not actively used because udevd turns on the video engine hardware for a short time to make a query in every boot. To fix this issue, this commit changes the clock handling logic to make the reset de-assertion triggered after enabling both eclk and vclk. Also, it adds clk_unprepare call for a case when probe fails. clk: ast2600: fix reset settings for eclk and vclk Video engine reset setting should be coupled with eclk to match it with the setting for previous Aspeed SoCs which is defined in clk-aspeed.c since all Aspeed SoCs are sharing a single video engine driver. Also, reset bit 6 is defined as 'Video Engine' reset in datasheet so it should be de-asserted when eclk is enabled. This commit fixes the setting.

CVSS Scoring

CVSS Score

5.0

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2020-36787
WEB https://git.kernel.org/stable/c/1dc1d30ac101bb8335d9852de2107af60c2580e7
WEB https://git.kernel.org/stable/c/2964c37563e86cfdc439f217eb3c5a69adfdba6a
WEB https://git.kernel.org/stable/c/3536169f8531c2c5b153921dc7d1ac9fd570cda7
WEB https://git.kernel.org/stable/c/75321dc8aebe3f30eff226028fe6da340fe0bf02
WEB https://git.kernel.org/stable/c/a59d01384c80a8a4392665802df57c3df20055f5

Advisory provided by GitHub Security Advisory Database. Published: February 28, 2024, Modified: December 11, 2024

References

https://git.kernel.org/stable/c/1dc1d30ac101bb8335d9852de2107af60c2580e7
https://git.kernel.org/stable/c/a59d01384c80a8a4392665802df57c3df20055f5
https://git.kernel.org/stable/c/2964c37563e86cfdc439f217eb3c5a69adfdba6a
https://git.kernel.org/stable/c/75321dc8aebe3f30eff226028fe6da340fe0bf02
https://git.kernel.org/stable/c/3536169f8531c2c5b153921dc7d1ac9fd570cda7
Published: 2024-02-28T08:13:07.275Z
Last Modified: 2025-05-04T06:59:01.363Z
Copied to clipboard!