fbdev: omap2: fix use-after-free in omapfb_mmap
In the Linux kernel, the following vulnerability has been resolved: fbdev: omap2: fix use-after-free in omapfb_mmap omapfb_mmap() has a race condition with OMAPFB_SETUP_PLANE ioctl that can lead to use-after-free: The fb_mmap() entry point holds mm_lock but not lock (fb_info->lock), while ioctl handlers like OMAPFB_SETUP_PLANE hold lock but not mm_lock. This allows concurrent execution. In omapfb_mmap(): 1. rg = omapfb_get_mem_region(ofbi->region); // Get old region ref 2. start = omapfb_get_region_paddr(ofbi); // Read from NEW region 3. len = fix->smem_len; // Read from NEW region 4. vm_iomap_memory(vma, start, len); // Map NEW region memory 5. atomic_inc(&rg->map_count); // Increment OLD region! Concurrently, OMAPFB_SETUP_PLANE can: - Reassign ofbi->region = new_rg - Update fix->smem_len - OMAPFB_SETUP_MEM then checks NEW region's map_count (0!) and frees it This leaves userspace with a mapping to freed physical memory. The fix is to read all required values (start, len) from the same region reference (rg) that will have its map_count incremented, preventing the region from being freed while still mapped.
CVE-2026-53401
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-2026-53401
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": "078ff546a806b2c2ab74c25c8edd4c6d4680656a",
"lessThan": "5e10b1747547c3815e90d28166e92144835e065f",
"versionType": "git"
},
{
"status": "affected",
"version": "078ff546a806b2c2ab74c25c8edd4c6d4680656a",
"lessThan": "986d5fafb73b8b866651399934b66d690f49135a",
"versionType": "git"
},
{
"status": "affected",
"version": "078ff546a806b2c2ab74c25c8edd4c6d4680656a",
"lessThan": "8363c219d88e78daaee5665117a0380442989338",
"versionType": "git"
},
{
"status": "affected",
"version": "078ff546a806b2c2ab74c25c8edd4c6d4680656a",
"lessThan": "6eb6ebcc8590007ad59ddccc8b5f9201655b33f8",
"versionType": "git"
},
{
"status": "affected",
"version": "078ff546a806b2c2ab74c25c8edd4c6d4680656a",
"lessThan": "7958e67375aa111522086286bba13cfc0816ce8d",
"versionType": "git"
}
],
"programFiles": [
"drivers/video/fbdev/omap2/omapfb/omapfb-main.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.36"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.36",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.3",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/video/fbdev/omap2/omapfb/omapfb-main.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-53401
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #46396 · Revision 1
- Added to Heist Feed
- Publisher date