drm/amd/display: Do not skip unrelated mode changes in DSC validation
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Do not skip unrelated mode changes in DSC validation Starting with commit 17ce8a6907f7 ("drm/amd/display: Add dsc pre-validation in atomic check"), amdgpu resets the CRTC state mode_changed flag to false when recomputing the DSC configuration results in no timing change for a particular stream. However, this is incorrect in scenarios where a change in MST/DSC configuration happens in the same KMS commit as another (unrelated) mode change. For example, the integrated panel of a laptop may be configured differently (e.g., HDR enabled/disabled) depending on whether external screens are attached. In this case, plugging in external DP-MST screens may result in the mode_changed flag being dropped incorrectly for the integrated panel if its DSC configuration did not change during precomputation in pre_validate_dsc(). At this point, however, dm_update_crtc_state() has already created new streams for CRTCs with DSC-independent mode changes. In turn, amdgpu_dm_commit_streams() will never release the old stream, resulting in a memory leak. amdgpu_dm_atomic_commit_tail() will never acquire a reference to the new stream either, which manifests as a use-after-free when the stream gets disabled later on: BUG: KASAN: use-after-free in dc_stream_release+0x25/0x90 [amdgpu] Write of size 4 at addr ffff88813d836524 by task kworker/9:9/29977 Workqueue: events drm_mode_rmfb_work_fn Call Trace: dump_stack_lvl+0x6e/
CVE-2026-31488
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-31488
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b",
"lessThan": "da1d0ed31e9802fd99384f43cc63678a5a11cb41",
"versionType": "git"
},
{
"status": "affected",
"version": "17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b",
"lessThan": "21159d8b335a6b9f44cbb506733013a902ae2da4",
"versionType": "git"
},
{
"status": "affected",
"version": "17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b",
"lessThan": "10862e344b4d6434642a48c87d765813fc0b0ba7",
"versionType": "git"
},
{
"status": "affected",
"version": "17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b",
"lessThan": "8a5edc97fd9c6415ff2eff872748439a97e3c3d8",
"versionType": "git"
},
{
"status": "affected",
"version": "17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b",
"lessThan": "111208b5b7ebcdadb3f922cc52d8425f0fa91b33",
"versionType": "git"
},
{
"status": "affected",
"version": "17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b",
"lessThan": "aed3d041ab061ec8a64f50a3edda0f4db7280025",
"versionType": "git"
}
],
"programFiles": [
"drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c",
"drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h",
"drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.140",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.80",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.21",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.11",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c",
"drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h",
"drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31488
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #39908 · Revision 1
- Added to Heist Feed
- Publisher date