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CVE Record

CVE-2024-26607: drm/bridge: sii902x: Fix probing race issue

In the Linux kernel, the following vulnerability has been resolved: drm/bridge: sii902x: Fix probing race issue A null pointer dereference crash has been observed rarely on TI platforms using sii9022 bridge: [ 53.271356] sii902x_get_edid+0x34/0x70 [sii902x] [ 53.276066] sii902x_bridge_get_edid+0x14/0x20 [sii902x] [ 53.281381] drm_bridge_get_edid+0x20/0x34 [drm] [ 53.286305] drm_bridge_connector_get_modes+0x8c/0xcc [drm_kms_helper] [ 53.292955] drm_helper_probe_single_connector_modes+0x190/0x538 [drm_kms_helper] [ 53.300510] drm_client_modeset_probe+0x1f0/0xbd4 [drm] [ 53.305958] __drm_fb_helper_initial_config_and_unlock+0x50/0x510 [drm_kms_helper] [ 53.313611] drm_fb_helper_initial_config+0x48/0x58 [drm_kms_helper] [ 53.320039] drm_fbdev_dma_client_hotplug+0x84/0xd4 [drm_dma_helper] [ 53.326401] drm_client_register+0x5c/0xa0 [drm] [ 53.331216] drm_fbdev_dma_setup+0xc8/0x13c [drm_dma_helper] [ 53.336881] tidss_probe+0x128/0x264 [tidss] [ 53.341174] platform_probe+0x68/0xc4 [ 53.344841] really_probe+0x188/0x3c4 [ 53.348501] __driver_probe_device+0x7c/0x16c [ 53.352854] driver_probe_device+0x3c/0x10c [ 53.357033] __device_attach_driver+0xbc/0x158 [ 53.361472] bus_for_each_drv+0x88/0xe8 [ 53.365303] __device_attach+0xa0/0x1b4 [ 53.369135] device_initial_probe+0x14/0x20 [ 53.373314] bus_probe_device+0xb0/0xb4 [ 53.377145] deferred_probe_work_func+0xcc/0x124 [ 53.381757] process_one_work+0x1f0/0x518 [ 53.385770] worker_thread+0x1e8/0x3dc [ 53.389519] kthread+0x11c/0x120 [ 53.392750] ret_from_fork+0x10/0x20 The issue here is as follows: - tidss probes, but is deferred as sii902x is still missing. - sii902x starts probing and enters sii902x_init(). - sii902x calls drm_bridge_add(). Now the sii902x bridge is ready from DRM's perspective. - sii902x calls sii902x_audio_codec_init() and platform_device_register_data() - The registration of the audio platform device causes probing of the deferred devices. - tidss probes, which eventually causes sii902x_bridge_get_edid() to be called. - sii902x_bridge_get_edid() tries to use the i2c to read the edid. However, the sii902x driver has not set up the i2c part yet, leading to the crash. Fix this by moving the drm_bridge_add() to the end of the sii902x_init(), which is also at the very end of sii902x_probe().

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

This CVE is a Linux kernel crash risk in a specific display bridge driver. On some TI platforms using the sii9022 bridge, device startup can expose the bridge to DRM before its I2C setup is complete, causing a rare null pointer dereference. The sources describe reliability impact, not data theft or remote compromise.

Executive priority

Treat this as a targeted platform reliability issue, not a broad emergency. Patch through normal kernel maintenance, with higher priority for products, appliances, or field devices that use the affected TI display stack and require dependable boot or display availability.

Technical view

The sii902x DRM bridge driver calls drm_bridge_add() too early during probe. Deferred tidss probing can then call sii902x_bridge_get_edid(), which uses I2C before the driver has initialized that path, producing a null pointer dereference. The documented fix moves drm_bridge_add() to the end of sii902x_init()/sii902x_probe().

Likely exposure

Exposure appears limited to Linux systems using the sii902x/sii9022 display bridge path, especially TI platforms with tidss and deferred probing. The source lists affected Linux kernel versions or branches including 5.0, 6.1.76, 6.6.15, 6.7.3, and 6.8, but does not provide CPEs.

Exploitation context

The CVE is not listed as KEV in the provided bundle, and no cited source reports active exploitation. The described trigger is an initialization race during device probing. The sources do not establish remote exploitability, privilege impact, or an attacker-controlled path.

Researcher notes

The source provides a clear race sequence and code-level remediation but lacks CVSS, CWE, CPE, and exploitability details. Validation should focus on kernel branch mapping, vendor backports, and reproducing or ruling out the probe-order crash on actual sii902x/tidss hardware.

Mitigation direction

  • Update to a Linux kernel build containing the referenced stable sii902x fix.
  • Check your distribution or device vendor advisory for the corrected kernel package.
  • Prioritize embedded or appliance platforms using TI display hardware and sii9022 bridges.
  • If patching is delayed, monitor affected devices for boot-time display driver crashes.

Validation and detection

  • Inventory kernels and hardware using the sii902x or sii9022 bridge driver.
  • Confirm the kernel includes the fix moving drm_bridge_add() to the end of probing.
  • Review crash logs for stacks involving sii902x_get_edid, tidss_probe, or drm_bridge_get_edid.
  • Regression-test display initialization and EDID detection on affected TI platforms.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
2ADP providers
5Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux21d808405fe49028036932dd969920f4fee4f481, 21d808405fe49028036932dd969920f4fee4f481, 21d808405fe49028036932dd969920f4fee4f481, 21d808405fe49028036932dd969920f4fee4f481unaffected
LinuxLinux5.0, 0, 6.1.76, 6.6.15, 6.7.3, 6.8affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.