Tracker / CVE-2024-39497
CVE-2024-39497
Medium 5.5
In the Linux kernel, the following vulnerability has been resolved: drm/shmem-helper: Fix BUG_ON() on mmap(PROT_WRITE, MAP_PRIVATE) Lack of check for copy-on-write (COW) mapping in drm_gem_shmem_mmap allows users to call mmap with PROT_WRITE and MAP_PRIVATE flag causing a kernel panic due to BUG_ON in vmf_insert_pfn_prot: BUG_ON((vma->vm_flags & VM_PFNMAP) && is_cow_mapping(vma->vm_flags)); Return -EINVAL early if COW mapping is detected. This bug affects all drm drivers using default shmem helpers. It can be reproduced by this simple example: void *ptr = mmap(0, size, PROT_WRITE, MAP_PRIVATE, fd, mmap_offset); ptr[0] = 0;
Affected products and versions
| linux | linux_kernel |
|---|---|
| linux | linux_kernel · 5.11 → 5.15.169 |
| linux | linux_kernel · 5.16 → 6.1.114 |
| linux | linux_kernel · 5.2 → 5.10.229 |
| linux | linux_kernel · 6.2 → 6.6.35 |
| linux | linux_kernel · 6.7 → 6.9.6 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.