drm/amd/display: fix division by zero in get_estimated_bw()
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: fix division by zero in get_estimated_bw() get_estimated_bw() divides by link->dpia_bw_alloc_config.bw_granularity, which is zeroed by reset_bw_alloc_struct() and only populated once DP_TUNNELING_BW_ALLOC_CAP_CHANGED has been handled. link_dp_dpia_handle_bw_alloc_status(), the DPCD interrupt handler, calls get_estimated_bw() whenever DP_TUNNELING_ESTIMATED_BW_CHANGED is set, independently of whether DP_TUNNELING_BW_ALLOC_CAP_CHANGED has ever fired for that link. A connected USB4/DPIA tunneling device that reports an estimated-bandwidth change before ever reporting a capability change drives a division by zero in this IRQ path. link_dpia_send_bw_alloc_request() already guards the same bw_granularity division; add the identical guard here rather than introducing a new pattern. (cherry picked from commit f2a961457c33dc34223aad5c9e8971de34a4eed3)
CVE-2026-90035
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-2026-90035
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": "8e5cfe547bf3beeb29d9608be68d22dff2b5012b",
"lessThan": "4c5b61b9df6ab33b55f228e1b6579cefad11a9f7",
"versionType": "git"
},
{
"status": "affected",
"version": "8e5cfe547bf3beeb29d9608be68d22dff2b5012b",
"lessThan": "ac2ab58a79bf2401ae8c5d1c030bf0a5a376f43a",
"versionType": "git"
},
{
"status": "affected",
"version": "8e5cfe547bf3beeb29d9608be68d22dff2b5012b",
"lessThan": "4814f28c45f58a71a80d09b80a60da6a063b539a",
"versionType": "git"
},
{
"status": "affected",
"version": "8e5cfe547bf3beeb29d9608be68d22dff2b5012b",
"lessThan": "b08c3d5ee7feadd821208f7c2c1ec02a16ce5878",
"versionType": "git"
},
{
"status": "affected",
"version": "8e5cfe547bf3beeb29d9608be68d22dff2b5012b",
"lessThan": "f63de9054da858d57054474c32464106f8375e0d",
"versionType": "git"
}
],
"programFiles": [
"drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.3"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90035
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #36462 · Revision 1
- Added to Heist Feed
- Publisher date