CVE-2024-39497

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;

• linux linux kernel (>= 5.2 < 5.10.229) • linux linux kernel (>= 5.11 < 5.15.169) • linux linux kernel (>= 5.16 < 6.1.114) • linux linux kernel (>= 6.2 < 6.6.35) • linux linux kernel (>= 6.7 < 6.9.6) • linux linux kernel 6.10