{ "affected": [ { "ranges": [ { "events": [ { "introduced": "17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b" }, { "fixed": "da1d0ed31e9802fd99384f43cc63678a5a11cb41" }, { "fixed": "21159d8b335a6b9f44cbb506733013a902ae2da4" }, { "fixed": "10862e344b4d6434642a48c87d765813fc0b0ba7" }, { "fixed": "8a5edc97fd9c6415ff2eff872748439a97e3c3d8" }, { "fixed": "111208b5b7ebcdadb3f922cc52d8425f0fa91b33" }, { "fixed": "aed3d041ab061ec8a64f50a3edda0f4db7280025" } ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "type": "GIT" } ] }, { "package": { "ecosystem": "Linux", "name": "Kernel" }, "ranges": [ { "events": [ { "introduced": "5.18.0" }, { "fixed": "6.1.175" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "6.2.0" }, { "fixed": "6.6.140" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "6.7.0" }, { "fixed": "6.12.80" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "6.13.0" }, { "fixed": "6.18.21" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "6.19.0" }, { "fixed": "6.19.11" } ], "type": "ECOSYSTEM" } ] } ], "database_specific": { "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31488.json" }, "details": "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 \u003cTASK\u003e\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)", "id": "CVE-2026-31488", "modified": "2026-07-08T05:36:34.688696467Z", "published": "2026-04-22T13:54:12.963Z", "references": [ { "type": "WEB", "url": "https://git.kernel.org/stable/c/10862e344b4d6434642a48c87d765813fc0b0ba7" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/111208b5b7ebcdadb3f922cc52d8425f0fa91b33" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/21159d8b335a6b9f44cbb506733013a902ae2da4" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/8a5edc97fd9c6415ff2eff872748439a97e3c3d8" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/aed3d041ab061ec8a64f50a3edda0f4db7280025" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/da1d0ed31e9802fd99384f43cc63678a5a11cb41" }, { "type": "WEB", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31488.json" }, { "type": "ADVISORY", "url": "https://access.redhat.com/errata/RHSA-2026:27353" }, { "type": "ADVISORY", "url": "https://access.redhat.com/errata/RHSA-2026:27354" }, { "type": "ADVISORY", "url": "https://access.redhat.com/errata/RHSA-2026:30848" }, { "type": "ADVISORY", "url": "https://access.redhat.com/security/cve/CVE-2026-31488" }, { "type": "ADVISORY", "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31488.json" }, { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31488" }, { "type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460619" }, { "type": "PACKAGE", "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git" } ], "schema_version": "1.7.5", "severity": [ { "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "type": "CVSS_V3" } ], "summary": "drm/amd/display: Do not skip unrelated mode changes in DSC validation" }