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CVE-2026-43477— drm/i915/vrr: Configure VRR timings after enabling TRANS_DDI_FUNC_CTL

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，该漏洞源于在启用TRANS_DDI_FUNC_CTL之前配置VRR时序，可能导致ICL平台在特定条件下发生挂起。

AI Predicted 3.3 Difficulty: Theoretical EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux dda7dcd9da73c5327aef42b89f0519bb51e84217< 8a7d29b8bda144d44e61df1b2705b1d4378f4e44 affected
dda7dcd9da73c5327aef42b89f0519bb51e84217< bf9e3b6ffd76da38dd4961c65d80571b25bf10a5 affected
dda7dcd9da73c5327aef42b89f0519bb51e84217< 237aab549676288d9255bb8dcc284738e56eaa31 affected
6.16 affected
< 6.16 unaffected
6.18.20≤ 6.18.* unaffected
6.19.9≤ 6.19.* unaffected
7.0≤ * unaffected
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I. Basic Information for CVE-2026-43477

Vulnerability Information
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Vulnerability Title
drm/i915/vrr: Configure VRR timings after enabling TRANS_DDI_FUNC_CTL
Source: CVE Program / CVE List V5
Vulnerability 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)
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，该漏洞源于在启用TRANS_DDI_FUNC_CTL之前配置VRR时序，可能导致ICL平台在特定条件下发生挂起。
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 dda7dcd9da73c5327aef42b89f0519bb51e84217 ~ 8a7d29b8bda144d44e61df1b2705b1d4378f4e44 -
Linux Linux 6.16 -

II. Public POCs for CVE-2026-43477

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III. Intelligence Information for CVE-2026-43477

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Patches & Fixes for CVE-2026-43477 (3)

Same Patch Batch · Linux · 2026-05-13 · 14 CVEs total

CVE-2026-43481 7.8 HIGH net-shapers: don't free reply skb after genlmsg_reply()
CVE-2026-43476 7.8 HIGH iio: chemical: sps30_i2c: fix buffer size in sps30_i2c_read_meas()
CVE-2026-43489 liveupdate: luo_file: remember retrieve() status
CVE-2026-43487 ata: libata-core: Disable LPM on ST1000DM010-2EP102
CVE-2026-43488 usb: xhci: Prevent interrupt storm on host controller error (HCE)
CVE-2026-43485 nouveau/gsp: drop WARN_ON in ACPI probes
CVE-2026-43486 arm64: contpte: fix set_access_flags() no-op check for SMMU/ATS faults
CVE-2026-43484 mmc: core: Avoid bitfield RMW for claim/retune flags
CVE-2026-43482 sched_ext: Disable preemption between scx_claim_exit() and kicking helper work
CVE-2026-43483 KVM: SVM: Set/clear CR8 write interception when AVIC is (de)activated
CVE-2026-43480 ASoC: amd: acp3x-rt5682-max9836: Add missing error check for clock acquisition
CVE-2026-43479 net: usb: lan78xx: fix WARN in __netif_napi_del_locked on disconnect
CVE-2026-43478 ASoC: codecs: rt1011: Use component to get the dapm context in spk_mode_put

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43477

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