CVE-2026-43477
📛 CVE Title
drm/i915/vrr: Configure VRR timings after enabling TRANS_DDI_FUNC_CTL
Description
In the Linux kernel, the following vulnerability has been resolved: drm/i915/vrr: Configure VRR timings after enabling TRANS_DDI_FUNC_CTL Apparently ICL may hang with an MCE if we write TRANS_VRR_VMAX/FLIPLINE before enabling TRANS_DDI_FUNC_CTL. Personally I was only able to reproduce a hang (on an Dell XPS 7390 2-in-1) with an external display connected via a dock using a dodgy type-C cable that made the link training fail. After the failed link training the machine would hang. TGL seemed immune to the problem for whatever reason. BSpec does tell us to configure VRR after enabling TRANS_DDI_FUNC_CTL as well. The DMC firmware also does the VRR restore in two stages: - first stage seems to be unconditional and includes TRANS_VRR_CTL and a few other VRR registers, among other things - second stage is conditional on the DDI being enabled, and includes TRANS_DDI_FUNC_CTL and TRANS_VRR_VMAX/VMIN/FLIPLINE, among other things So let's reorder the steps to match to avoid the hang, and toss in an extra WARN to make sure we don't screw this up later. BSpec: 22243 (cherry picked from commit 93f3a267c3dd4d811b224bb9e179a10d81456a74)
Overview
- State
- PUBLISHED
- Assigner (CNA)
- Linux
- CVSS severity
- high
- CVSS score
- 7.1 / 10
- CVSS vector
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H- Effective score
- 7.1 / 10 HIGH source: CNA overview
- CWE(s)
- —
- Reserved
- 2026-05-01
- Published
- 2026-05-13 17:08 UTC
- Last updated
- 2026-05-13 17:08 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/43xxx/CVE-2026-43477.json
- Linked Threat
- CVE-2026-43477 — CVE-2026-43477
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-05-13 16:16:50 UTC
- NVD last modified
- 2026-05-13 16:16:50 UTC
- EPSS score
- 0.0002 (probability of exploitation in next 30 days)
- EPSS percentile
- 6.46% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24
NVD / KEV / EPSS data refreshed 2026-05-25 08:59 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2026-30013 - Assigner
- Linux
- Published
- May 13, 2026, 3:08:26 PM
- Updated
- May 13, 2026, 3:08:26 PM
- EUVD base score
- 0.0 / 10
- EUVD-reported EPSS
- 0.0200
- Vendors
- Linux
- Products
-
Linux (patch: 7.0)Linux (patch: 6.19.9)Linux (patch: 0)Linux (dda7dcd9da73c5327aef42b89f0519bb51e84217 <bf9e3b6ffd76da38dd4961c65d80571b25bf10a5)Linux (dda7dcd9da73c5327aef42b89f0519bb51e84217 <237aab549676288d9255bb8dcc284738e56eaa31)Linux (dda7dcd9da73c5327aef42b89f0519bb51e84217 <8a7d29b8bda144d44e61df1b2705b1d4378f4e44)Linux (6.16)Linux (patch: 6.18.20)
ENISA description: In the Linux kernel, the following vulnerability has been resolved: drm/i915/vrr: Configure VRR timings after enabling TRANS_DDI_FUNC_CTL Apparently ICL may hang with an MCE if we write TRANS_VRR_VMAX/FLIPLINE before enabling TRANS_DDI_FUNC_CTL. Personally I was only able to reproduce a hang (on an Dell XPS 7390 2-in-1) with an external display connected via a dock using a dodgy type-C cable that made the link training fail. After the failed link training the machine would hang. TGL seemed immune to the problem for whatever reason. BSpec does tell us to configure VRR after enabling TRANS_DDI_FUNC_CTL as well. The DMC firmware also does the VRR restore in two stages: - first stage seems to be unconditional and includes TRANS_VRR_CTL and a few other VRR registers, among other things - second stage is conditional on the DDI being enabled, and includes TRANS_DDI_FUNC_CTL and TRANS_VRR_VMAX/VMIN/FLIPLINE, among other things So let's reorder the steps to match to avoid the hang, and toss in an extra WARN to make sure we don't screw this up later. BSpec: 22243 (cherry picked from commit 93f3a267c3dd4d811b224bb9e179a10d81456a74)
Affected products (2)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| Linux | Linux |
dda7dcd9da73c5327aef42b89f0519bb51e84217 (affected),
dda7dcd9da73c5327aef42b89f0519bb51e84217 (affected),
dda7dcd9da73c5327aef42b89f0519bb51e84217 (affected)
|
— |
| Linux | Linux |
6.16 (affected),
0 (unaffected),
6.18.20 (unaffected),
6.19.9 (unaffected),
7.0 (unaffected)
|
— |
Vendor references (3)
References embedded in the original CVE record by the assigning CNA.
MITRE references (3) cveawg.mitre.org
Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.
Web references (3)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- https://nvd.nist.gov/vuln/detail/CVE-2026-43477 tenable:nvd.nist.gov
- https://www.cve.org/CVERecord?id=CVE-2026-43477 tenable:www.cve.org
- https://www.first.org/epss/ tenable:www.first.org
NVD-tagged references (3)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://git.kernel.org/stable/c/237aab549676288d9255bb8dcc284738e56eaa31 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- https://git.kernel.org/stable/c/8a7d29b8bda144d44e61df1b2705b1d4378f4e44 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- https://git.kernel.org/stable/c/bf9e3b6ffd76da38dd4961c65d80571b25bf10a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remediations (17)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:blog.qualys.com
With Qualys Policy Audit's out-of-the-box mitigation or Compensatory Controls, which reduce the risk of a vulnerability being exploited because the remediation ( fix / patch ) cannot be done immediately, these security controls are not recommended by any industry standards, such as CIS and DISA-STIG.
2026-05-23 20:55 UTC -
web:krebsonsecurity.com
Microsoft expects that exploitation is more likely. May's Patch Tuesday is a welcome respite from April, which saw Microsoft fix a near-record 167 security flaws.
2026-05-23 20:55 UTC -
web:nvd.nist.gov
Official websites use .gov A .gov website belongs to an official government organization in the United States.
2026-05-23 20:55 UTC -
web:portal.msrc.microsoft.com
The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.
2026-05-23 20:55 UTC -
web:stack.watch
Apache Log4j Core 2.25.3 Insecure TLS Hostname Verification in Ssl Config CVE - 2026 -34477 Published on April 10, 2026
2026-05-23 20:55 UTC -
web:www.crowdstrike.com
Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.
2026-05-23 20:55 UTC -
web:www.herodevs.com
This is the incomplete- fix follow-up to CVE -2025-68161. The 2.25.3 patch enabled hostname verification only when the log4j2.sslVerifyHostName JVM system property was set; it never touched the <Ssl verifyHostName="true"> attribute path, so the documented configuration mechanism remained silently ignored until 2.25.4.
2026-05-23 20:55 UTC -
web:www.oracle.com
This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.
2026-05-23 20:55 UTC -
web:www.rapid7.com
The fix for CVE -2025-68161 was incomplete: it addressed hostname verification only when enabled via the log4j2.sslVerifyHostName system property, but not when configured through the verifyHostName attribute of the Ssl element. Although the verifyHostName configuration attribute was introduced in Log4j Core 2.12.0, it was silently ignored in all versions through 2.25.3, leaving TLS connections ...
2026-05-23 20:55 UTC -
web:www.windowslatest.com
Windows 11 April 2026 update adds Narrator Copilot support, faster Settings, File Explorer fixes, and key security improvements.
2026-05-23 20:55 UTC -
web:cybersecuritynews.com
Microsoft released its March 2026 Patch Tuesday security update on March 10, 2026 , addressing 78 vulnerabilities across Windows, Microsoft Office, Azure, SQL Server, and .NET. The update includes one actively exploited zero-day vulnerability and multiple Critical-rated flaws demanding immediate attention from security teams. The most urgent fix this month is CVE - 2026 -21262, the sole zero-day ...
2026-05-26 02:54 UTC -
web:integsec.com
CVE‑2026‑44277 is a critical remote code execution flaw in Fortinet FortiAuthenticator that allows unauthenticated attackers to take full control of the appliance. Any organization using affected FortiAuthenticator versions must patch immediately or otherwise secure the appliance to prevent attackers from compromising identity and access management. Exposure to this vulnerability can lead ...
2026-05-26 02:54 UTC -
web:learn.microsoft.com
In this library you will find the following security documents that have been released by the Microsoft Security Response Center (MSRC). The MSRC investigates all reports of security vulnerabilities affecting Microsoft products and services, and releases these documents as part of the ongoing effort to help you manage security risks and help keep your systems protected. Please use the ...
2026-05-26 02:54 UTC -
web:www.bleepingcomputer.com
On Monday, CISA added CVE - 2026 -35616 to its Known Exploited Vulnerabilities (KEV) Catalog and ordered Federal Civilian Executive Branch (FCEB) agencies to patch FortiClient EMS instances by ...
2026-05-26 02:54 UTC -
web:www.computerworld.com
Each month, the team at Readiness analyzes the latest Patch Tuesday updates from Microsoft and provides detailed, actionable testing guidance. The company's Patch Tuesday release for February ...
2026-05-26 02:54 UTC -
web:www.cve.org
At cve .org, we provide the authoritative reference method for publicly known information-security vulnerabilities and exposures
2026-05-26 02:54 UTC -
web:www.rapid7.com
Microsoft is publishing 77 vulnerabilities this Patch Tuesday, including two publicly disclosed zero-day vulnerabilities.
2026-05-26 02:54 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-43477.json.
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/gpu/drm/i915/display/intel_display.c",
"drivers/gpu/drm/i915/display/intel_vrr.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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{
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}
]
},
{
"defaultStatus": "affected",
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"programFiles": [
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"drivers/gpu/drm/i915/display/intel_vrr.c"
],
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"vendor": "Linux",
"versions": [
{
"status": "affected",
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},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.20",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.20",
"versionStartIncluding": "6.16",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/vrr: Configure VRR timings after enabling TRANS_DDI_FUNC_CTL\n\nApparently ICL may hang with an MCE if we write TRANS_VRR_VMAX/FLIPLINE\nbefore enabling TRANS_DDI_FUNC_CTL.\n\nPersonally I was only able to reproduce a hang (on an Dell XPS 7390\n2-in-1) with an external display connected via a dock using a dodgy\ntype-C cable that made the link training fail. After the failed\nlink training the machine would hang. TGL seemed immune to the\nproblem for whatever reason.\n\nBSpec does tell us to configure VRR after enabling TRANS_DDI_FUNC_CTL\nas well. The DMC firmware also does the VRR restore in two stages:\n- first stage seems to be unconditional and includes TRANS_VRR_CTL\n and a few other VRR registers, among other things\n- second stage is conditional on the DDI being enabled,\n and includes TRANS_DDI_FUNC_CTL and TRANS_VRR_VMAX/VMIN/FLIPLINE,\n among other things\n\nSo let's reorder the steps to match to avoid the hang, and\ntoss in an extra WARN to make sure we don't screw this up later.\n\nBSpec: 22243\n(cherry picked from commit 93f3a267c3dd4d811b224bb9e179a10d81456a74)"
}
],
"providerMetadata": {
"dateUpdated": "2026-05-13T15:08:26.763Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
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"url": "https://git.kernel.org/stable/c/8a7d29b8bda144d44e61df1b2705b1d4378f4e44"
},
{
"url": "https://git.kernel.org/stable/c/bf9e3b6ffd76da38dd4961c65d80571b25bf10a5"
},
{
"url": "https://git.kernel.org/stable/c/237aab549676288d9255bb8dcc284738e56eaa31"
}
],
"title": "drm/i915/vrr: Configure VRR timings after enabling TRANS_DDI_FUNC_CTL",
"x_generator": {
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"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-43477",
"datePublished": "2026-05-13T15:08:26.763Z",
"dateReserved": "2026-05-01T14:12:56.011Z",
"dateUpdated": "2026-05-13T15:08:26.763Z",
"state": "PUBLISHED"
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}