{"id":"CVE-2026-68364","state":"PUBLISHED","title":"drm/amd/display: Fix ISM dc_lock deadlock during suspend","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Fix ISM dc_lock deadlock during suspend\n\n[Why]\nSystem hang observed during suspend/resume while video is playing.\namdgpu_dm_ism_disable() is called under dc_lock and waits for ISM\ndelayed work via disable_delayed_work_sync(). The work handlers\nthemselves take dc_lock, producing an ABBA deadlock when a worker is\nin flight at suspend time.\n\n[How]\nSplit the disable path into two phases with opposite locking\ncontracts:\n  1. amdgpu_dm_ism_disable() -- quiesces workers, must NOT hold\n     dc_lock.\n  2. amdgpu_dm_ism_force_full_power() (new) -- drives the ISM FSM\n     back to FULL_POWER_RUNNING, must hold dc_lock.","publishedAt":"2026-08-10T12:03:41.385Z","updatedAt":"2026-08-18T06:55:58.239Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"754003486c3cc95f2fcb9d6b71a779047d6db95c","status":"affected","lessThan":"95776812e6b8f908563e8994d5d947b68baf68a6","versionType":"git"},{"version":"754003486c3cc95f2fcb9d6b71a779047d6db95c","status":"affected","lessThan":"3714fe242592e3699ac5e2c19d68b275a210be7d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c","drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_ism.c","drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_ism.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"7.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"7.1","versionType":"semver"},{"version":"7.1.6","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/amd/display/amdgpu_dm/amdgpu_dm.c","drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_ism.c","drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_ism.h"]}],"references":["https://git.kernel.org/stable/c/95776812e6b8f908563e8994d5d947b68baf68a6","https://git.kernel.org/stable/c/3714fe242592e3699ac5e2c19d68b275a210be7d"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/68xxx/CVE-2026-68364.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68364","state":"PUBLISHED","datePublished":"2026-08-10T12:03:41.385Z","dateUpdated":"2026-08-18T06:55:58.239Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-30T09:28:09.385Z"},"containers":{"cna":{"title":"drm/amd/display: Fix ISM dc_lock deadlock during suspend","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Fix ISM dc_lock deadlock during suspend\n\n[Why]\nSystem hang observed during suspend/resume while video is playing.\namdgpu_dm_ism_disable() is called under dc_lock and waits for ISM\ndelayed work via disable_delayed_work_sync(). The work handlers\nthemselves take dc_lock, producing an ABBA deadlock when a worker is\nin flight at suspend time.\n\n[How]\nSplit the disable path into two phases with opposite locking\ncontracts:\n  1. amdgpu_dm_ism_disable() -- quiesces workers, must NOT hold\n     dc_lock.\n  2. amdgpu_dm_ism_force_full_power() (new) -- drives the ISM FSM\n     back to FULL_POWER_RUNNING, must hold dc_lock."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"754003486c3cc95f2fcb9d6b71a779047d6db95c","status":"affected","lessThan":"95776812e6b8f908563e8994d5d947b68baf68a6","versionType":"git"},{"version":"754003486c3cc95f2fcb9d6b71a779047d6db95c","status":"affected","lessThan":"3714fe242592e3699ac5e2c19d68b275a210be7d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c","drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_ism.c","drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_ism.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"7.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"7.1","versionType":"semver"},{"version":"7.1.6","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/amd/display/amdgpu_dm/amdgpu_dm.c","drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_ism.c","drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_ism.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/95776812e6b8f908563e8994d5d947b68baf68a6"},{"url":"https://git.kernel.org/stable/c/3714fe242592e3699ac5e2c19d68b275a210be7d"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-18T06:55:58.239Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.1","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.1","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}