GHSA-J9HG-PRQV-M4RX
Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-15 06:32In the Linux kernel, the following vulnerability has been resolved:
drm/rockchip: inno-hdmi: Switch to drmm_kzalloc()
Driver makes use of drmm_encoder_init() to initialize the encoder and automatically handle the cleanup by registering drm_encoder_cleanup() with drmm_add_action().
However, the internal structure containing the encoder part gets allocated with devm_kzalloc(), which happens while component_bind_all() is being called from Rockchip DRM driver. The component framework further ensures it is deallocated as part of releasing all the resources claimed during bind, which is triggered from component_unbind_all().
When the reference to the DRM device gets eventually dropped via drm_dev_put() in rockchip_drm_unbind(), drmm_encoder_alloc_release() attempts to access the now released encoder structure, leading to use-after-free.
Ensure driver's internal structure is still reachable on encoder cleanup by switching from a device-managed allocation to a drm-managed one.
{
"affected": [],
"aliases": [
"CVE-2026-74422"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-15T06:22:44Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/rockchip: inno-hdmi: Switch to drmm_kzalloc()\n\nDriver makes use of drmm_encoder_init() to initialize the encoder and\nautomatically handle the cleanup by registering drm_encoder_cleanup()\nwith drmm_add_action().\n\nHowever, the internal structure containing the encoder part gets\nallocated with devm_kzalloc(), which happens while component_bind_all()\nis being called from Rockchip DRM driver. The component framework\nfurther ensures it is deallocated as part of releasing all the resources\nclaimed during bind, which is triggered from component_unbind_all().\n\nWhen the reference to the DRM device gets eventually dropped via\ndrm_dev_put() in rockchip_drm_unbind(), drmm_encoder_alloc_release()\nattempts to access the now released encoder structure, leading to\nuse-after-free.\n\nEnsure driver\u0027s internal structure is still reachable on encoder cleanup\nby switching from a device-managed allocation to a drm-managed one.",
"id": "GHSA-j9hg-prqv-m4rx",
"modified": "2026-08-15T06:32:33Z",
"published": "2026-08-15T06:32:33Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74422"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/195ab348af4b2bdf5988f9397059317bb68fd797"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3cc50e7f73fcf79f28660b9d91566b13cb62e520"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
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