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

AI Predicted 3.3 Difficulty: Theoretical EPSS 0.02% · P4

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinuxdda7dcd9da73c5327aef42b89f0519bb51e84217< 8a7d29b8bda144d44e61df1b2705b1d4378f4e44affected
dda7dcd9da73c5327aef42b89f0519bb51e84217< bf9e3b6ffd76da38dd4961c65d80571b25bf10a5affected
dda7dcd9da73c5327aef42b89f0519bb51e84217< 237aab549676288d9255bb8dcc284738e56eaa31affected
6.16affected
< 6.16unaffected
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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux dda7dcd9da73c5327aef42b89f0519bb51e84217 ~ 8a7d29b8bda144d44e61df1b2705b1d4378f4e44 -
LinuxLinux 6.16 -

II. Public POCs for CVE-2026-43477

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III. Intelligence Information for CVE-2026-43477

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

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43477

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