CVE-2020-36787
media: aspeed: fix clock handling logic
- Published
- Updated
- Reserved
- Assigned by
- Linux
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.
Timeline
ID reserved
By Linux
- 2 days later
· 2 days later
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.23% · top 86% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected d2b4387f3bdf016e266d23cf657465f557721488 – < 1dc1d30ac101bb8335d9852de2107af60c2580e7
- affected d2b4387f3bdf016e266d23cf657465f557721488 – < a59d01384c80a8a4392665802df57c3df20055f5
- affected d2b4387f3bdf016e266d23cf657465f557721488 – < 2964c37563e86cfdc439f217eb3c5a69adfdba6a
- affected d2b4387f3bdf016e266d23cf657465f557721488 – < 75321dc8aebe3f30eff226028fe6da340fe0bf02
- affected d2b4387f3bdf016e266d23cf657465f557721488 – < 3536169f8531c2c5b153921dc7d1ac9fd570cda7
- affected 5.0
- unaffected < 5.0
- unaffected 5.4.119 – ≤ 5.4.*
- unaffected 5.10.37 – ≤ 5.10.*
- unaffected 5.11.21 – ≤ 5.11.*
- unaffected 5.12.4 – ≤ 5.12.*
- unaffected 5.13 – ≤ *
References (5)
- https://git.kernel.org/stable/c/1dc1d30ac101bb8335d9852de2107af60c2580e7 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/a59d01384c80a8a4392665802df57c3df20055f5 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/2964c37563e86cfdc439f217eb3c5a69adfdba6a (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/75321dc8aebe3f30eff226028fe6da340fe0bf02 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/3536169f8531c2c5b153921dc7d1ac9fd570cda7 (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2020-36787)Record last updated .