{"id":"CVE-2026-31488","revision":"006a698745144059ade2e75485b054b1","records":[{"revision":"006a698745144059ade2e75485b054b1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-31488","aliases":[],"title":"drm/amd/display: Do not skip unrelated mode changes in DSC validation","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Do not skip unrelated mode changes in DSC validation\n\nStarting with commit 17ce8a6907f7 (\"drm/amd/display: Add dsc pre-validation in\natomic check\"), amdgpu resets the CRTC state mode_changed flag to false when\nrecomputing the DSC configuration results in no timing change for a particular\nstream.\n\nHowever, this is incorrect in scenarios where a change in MST/DSC configuration\nhappens in the same KMS commit as another (unrelated) mode change. For example,\nthe integrated panel of a laptop may be configured differently (e.g., HDR\nenabled/disabled) depending on whether external screens are attached. In this\ncase, plugging in external DP-MST screens may result in the mode_changed flag\nbeing dropped incorrectly for the integrated panel if its DSC configuration\ndid not change during precomputation in pre_validate_dsc().\n\nAt this point, however, dm_update_crtc_state() has already created new streams\nfor CRTCs with DSC-independent mode changes. In turn,\namdgpu_dm_commit_streams() will never release the old stream, resulting in a\nmemory leak. amdgpu_dm_atomic_commit_tail() will never acquire a reference to\nthe new stream either, which manifests as a use-after-free when the stream gets\ndisabled later on:\n\nBUG: KASAN: use-after-free in dc_stream_release+0x25/0x90 [amdgpu]\nWrite of size 4 at addr ffff88813d836524 by task kworker/9:9/29977\n\nWorkqueue: events drm_mode_rmfb_work_fn\nCall Trace:\n <TASK>\n dump_stack_lvl+0x6e/0xa0\n print_address_description.constprop.0+0x88/0x320\n ? dc_stream_release+0x25/0x90 [amdgpu]\n print_report+0xfc/0x1ff\n ? srso_alias_return_thunk+0x5/0xfbef5\n ? __virt_addr_valid+0x225/0x4e0\n ? dc_stream_release+0x25/0x90 [amdgpu]\n kasan_report+0xe1/0x180\n ? dc_stream_release+0x25/0x90 [amdgpu]\n kasan_check_range+0x125/0x200\n dc_stream_release+0x25/0x90 [amdgpu]\n dc_state_destruct+0x14d/0x5c0 [amdgpu]\n dc_state_release.part.0+0x4e/0x130 [amdgpu]\n dm_atomic_destroy_state+0x3f/0x70 [amdgpu]\n drm_atomic_state_default_clear+0x8ee/0xf30\n ? drm_mode_object_put.part.0+0xb1/0x130\n __drm_atomic_state_free+0x15c/0x2d0\n atomic_remove_fb+0x67e/0x980\n\nSince there is no reliable way of figuring out whether a CRTC has unrelated\nmode changes pending at the time of DSC validation, remember the value of the\nmode_changed flag from before the point where a CRTC was marked as potentially\naffected by a change in DSC configuration. Reset the mode_changed flag to this\nearlier value instead in pre_validate_dsc().\n\n(cherry picked from commit cc7c7121ae082b7b82891baa7280f1ff2608f22b)","state":0,"publishedAt":"2026-04-22T13:54:12.963+00:00","modifiedAt":"2026-10-19T18:45:53.635+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c\",\n                        \"drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h\",\n                        \"drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b\",\n                            \"lessThan\": \"da1d0ed31e9802fd99384f43cc63678a5a11cb41\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b\",\n                            \"lessThan\": \"21159d8b335a6b9f44cbb506733013a902ae2da4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b\",\n                            \"lessThan\": \"10862e344b4d6434642a48c87d765813fc0b0ba7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b\",\n                            \"lessThan\": \"8a5edc97fd9c6415ff2eff872748439a97e3c3d8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b\",\n                            \"lessThan\": \"111208b5b7ebcdadb3f922cc52d8425f0fa91b33\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b\",\n                            \"lessThan\": \"aed3d041ab061ec8a64f50a3edda0f4db7280025\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c\",\n                        \"drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h\",\n                        \"drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.18\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.18\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.175\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.140\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.80\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.21\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.11\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/da1d0ed31e9802fd99384f43cc63678a5a11cb41","https://git.kernel.org/stable/c/21159d8b335a6b9f44cbb506733013a902ae2da4","https://git.kernel.org/stable/c/10862e344b4d6434642a48c87d765813fc0b0ba7","https://git.kernel.org/stable/c/8a5edc97fd9c6415ff2eff872748439a97e3c3d8","https://git.kernel.org/stable/c/111208b5b7ebcdadb3f922cc52d8425f0fa91b33","https://git.kernel.org/stable/c/aed3d041ab061ec8a64f50a3edda0f4db7280025"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31488","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-31488","identifiers":["CVE-2026-31488"]},"retained":false,"historicalAffected":[]}],"coverage":[]}