{"id":"CVE-2026-74421","state":"PUBLISHED","title":"drm/rockchip: dw_dp: Switch to drmm_kzalloc()","description":"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.","publishedAt":"2026-08-15T05:59:25.328Z","updatedAt":"2026-08-17T05:19:06.310Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d68ba7bac9555d05e2f5b310c898b2a5c7eff174","status":"affected","lessThan":"0d60b835bca42f0f790689dd47819ed881a92ccc","versionType":"git"},{"version":"d68ba7bac9555d05e2f5b310c898b2a5c7eff174","status":"affected","lessThan":"6b0b92d1110eccccbd5ba2949bd2b9fb6ea5fc12","versionType":"git"},{"version":"d68ba7bac9555d05e2f5b310c898b2a5c7eff174","status":"affected","lessThan":"ed9da8d23020352ad24c528db09b5acdd78b81fd","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/rockchip/dw_dp-rockchip.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/rockchip/dw_dp-rockchip.c"]}],"references":["https://git.kernel.org/stable/c/0d60b835bca42f0f790689dd47819ed881a92ccc","https://git.kernel.org/stable/c/6b0b92d1110eccccbd5ba2949bd2b9fb6ea5fc12","https://git.kernel.org/stable/c/ed9da8d23020352ad24c528db09b5acdd78b81fd"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74421.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74421","state":"PUBLISHED","datePublished":"2026-08-15T05:59:25.328Z","dateUpdated":"2026-08-17T05:19:06.310Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.894Z"},"containers":{"cna":{"title":"drm/rockchip: dw_dp: Switch to drmm_kzalloc()","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d68ba7bac9555d05e2f5b310c898b2a5c7eff174","status":"affected","lessThan":"0d60b835bca42f0f790689dd47819ed881a92ccc","versionType":"git"},{"version":"d68ba7bac9555d05e2f5b310c898b2a5c7eff174","status":"affected","lessThan":"6b0b92d1110eccccbd5ba2949bd2b9fb6ea5fc12","versionType":"git"},{"version":"d68ba7bac9555d05e2f5b310c898b2a5c7eff174","status":"affected","lessThan":"ed9da8d23020352ad24c528db09b5acdd78b81fd","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/rockchip/dw_dp-rockchip.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/rockchip/dw_dp-rockchip.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/0d60b835bca42f0f790689dd47819ed881a92ccc"},{"url":"https://git.kernel.org/stable/c/6b0b92d1110eccccbd5ba2949bd2b9fb6ea5fc12"},{"url":"https://git.kernel.org/stable/c/ed9da8d23020352ad24c528db09b5acdd78b81fd"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:19:06.310Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}