{"id":"CVE-2026-74421","summary":"drm/rockchip: dw_dp: Switch to drmm_kzalloc()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/rockchip: dw_dp: 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's internal structure is still reachable on encoder cleanup\nby switching from a device-managed allocation to a drm-managed one.","modified":"2026-08-18T03:31:03.906034271Z","published":"2026-08-15T05:59:25.328Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74421.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0d60b835bca42f0f790689dd47819ed881a92ccc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6b0b92d1110eccccbd5ba2949bd2b9fb6ea5fc12"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ed9da8d23020352ad24c528db09b5acdd78b81fd"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74421.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74421"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d68ba7bac9555d05e2f5b310c898b2a5c7eff174"},{"fixed":"0d60b835bca42f0f790689dd47819ed881a92ccc"},{"fixed":"6b0b92d1110eccccbd5ba2949bd2b9fb6ea5fc12"},{"fixed":"ed9da8d23020352ad24c528db09b5acdd78b81fd"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74421.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.18.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74421.json"}}],"schema_version":"1.9.0"}