CVE-2024-26607 Affecting kernel-default-base package, versions <5.14.21-150400.24.111.2.150400.24.52.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-SLES154-KERNELDEFAULTBASE-6445955
- published15 Mar 2024
- disclosed14 Mar 2024
Introduced: 14 Mar 2024
CVE-2024-26607 (opens in a new tab)How to fix?
Upgrade SLES:15.4 kernel-default-base to version 5.14.21-150400.24.111.2.150400.24.52.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-default-base package and not the kernel-default-base package as distributed by SLES.
See How to fix? for SLES:15.4 relevant fixed versions and status.
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().
References
- https://www.suse.com/security/cve/CVE-2024-26607.html
- https://bugzilla.suse.com/1220736
- https://git.kernel.org/stable/c/08ac6f132dd77e40f786d8af51140c96c6d739c9
- https://git.kernel.org/stable/c/2a4c6af7934a7b4c304542c38fee35e09cc1770c
- https://git.kernel.org/stable/c/56f96cf6eb11a1c2d594367c3becbfb06a855ec1
- https://git.kernel.org/stable/c/e0f83c234ea7a3dec1f84e5d02caa1c51664a076