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EPSS 0.2%top 93%

In the Linux kernel, the following vulnerability has been resolved: fbdev: omap2: fix use-after-free in omapfb_mmap omapfb_mmap() has a race… (CVE-2026-53401)

0
Medium
Published: 07/19/2026 (07/19/2026, 12:16:00 UTC)
Source: GCVE Database
Product: linux

Description

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.

CVSS v3.1

Score 7.8high

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Technical Details

Gcve Source
db.gcve.eu
Osv Id
GHSA-jrv4-9p26-4849
Osv Schema Version
1.4.0
Aliases
["CVE-2026-53401"]
Ecosystems
[]
Database Specific Severity
null
Cvss Version
3.1

Threat ID: 6a5d27ad2a4a8d59891318dc

Added to database: 07/19/2026, 19:38:21 UTC

Last enriched: 08/15/2026, 03:38:11 UTC

Last updated: 09/02/2026, 22:52:12 UTC

Views: 86

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