drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs()
In the Linux kernel, the following vulnerability has been resolved: drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs() drm_gem_fb_init_with_funcs() computes sub-sampled plane dimensions using plain integer division: unsigned int width = mode_cmd->width / (i ? info->hsub : 1); unsigned int height = mode_cmd->height / (i ? info->vsub : 1); However, the ioctl-level framebuffer_check() in drm_framebuffer.c uses drm_format_info_plane_width/height() which round up dimensions via DIV_ROUND_UP(). This inconsistency corrupts the subsequent GEM object size check for certain pixel format and dimension combinations. For example, with NV12 (vsub=2) and a 1-pixel-tall framebuffer the GEM size validation path sees height=0 instead of height=1. The expression (height - 1) then wraps to UINT_MAX as an unsigned int, causing min_size to overflow and wrap back to a small value. A tiny GEM object therefore passes the size guard, yet when the GPU accesses the chroma plane it will read or write memory beyond the object's bounds. Fix by replacing the open-coded divisions with drm_format_info_plane_width() and drm_format_info_plane_height(), which use DIV_ROUND_UP() and match the calculation already used in framebuffer_check().
CVE-2026-46209
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-2026-46209
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": "4c3dbb2c312c9fafbac30d98c523b8b1f3455d78",
"lessThan": "11427ad6c9f0def5ce567982b785da3191946430",
"versionType": "git"
},
{
"status": "affected",
"version": "4c3dbb2c312c9fafbac30d98c523b8b1f3455d78",
"lessThan": "adfc5ba4ef4dd2bca5969f40e8fc7b41fb3902ad",
"versionType": "git"
},
{
"status": "affected",
"version": "4c3dbb2c312c9fafbac30d98c523b8b1f3455d78",
"lessThan": "22922f7dae74409fc4bf0f1142710cb6b8ce8cc2",
"versionType": "git"
},
{
"status": "affected",
"version": "4c3dbb2c312c9fafbac30d98c523b8b1f3455d78",
"lessThan": "6b992591e04f2cce813bcf239b354f375bbf84d3",
"versionType": "git"
},
{
"status": "affected",
"version": "4c3dbb2c312c9fafbac30d98c523b8b1f3455d78",
"lessThan": "1da4ab7189f1064b3b712b388772c008b4d82580",
"versionType": "git"
},
{
"status": "affected",
"version": "4c3dbb2c312c9fafbac30d98c523b8b1f3455d78",
"lessThan": "1a17ea9861e89585361caa8bc231bd22dc6dbe7d",
"versionType": "git"
},
{
"status": "affected",
"version": "4c3dbb2c312c9fafbac30d98c523b8b1f3455d78",
"lessThan": "c5fc49d8470c5ebf3b41607600f277158f159950",
"versionType": "git"
},
{
"status": "affected",
"version": "4c3dbb2c312c9fafbac30d98c523b8b1f3455d78",
"lessThan": "3d4c2268bd7243c3780fe32bf24ff876da272acf",
"versionType": "git"
}
],
"programFiles": [
"drivers/gpu/drm/drm_gem_framebuffer_helper.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.14"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.14",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.258",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"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": "6.12.90",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.32",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.9",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/gpu/drm/drm_gem_framebuffer_helper.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-46209
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40158 · Revision 1
- Added to Heist Feed
- Publisher date