CVE-2026-53401: 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…

PriorityP342high7.8CVSS 3.1

AVLACLPRLUINSUCHIHAH

EPSS

0.13%

3.0th percentile

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.

Affected

4 ranges

Vendor	Product	Version range	Fixed in
linux	linux	—	—
linux	linux	>= 078ff546a806b2c2ab74c25c8edd4c6d4680656a < 6eb6ebcc8590007ad59ddccc8b5f9201655b33f8	6eb6ebcc8590007ad59ddccc8b5f9201655b33f8
linux	linux	>= 078ff546a806b2c2ab74c25c8edd4c6d4680656a < 7958e67375aa111522086286bba13cfc0816ce8d	7958e67375aa111522086286bba13cfc0816ce8d
linux	linux_kernel	>= 2.6.36 < 7.1.3	7.1.3

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

vendor_redhat7.8HIGH

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