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CVE PROGRAM SOURCE RECORDUnscored

CVE-2024-39497

drm/shmem-helper: Fix BUG_ON() on mmap(PROT_WRITE, MAP_PRIVATE)

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 2194a63a818db71065ebe09c8104f5f021ca4e7b to < a508a102edf8735adc9bb73d37dd13c38d1a1b10affected
  • 2194a63a818db71065ebe09c8104f5f021ca4e7b to < 3ae63a8c1685e16958560ec08d30defdc5b9cca0affected
  • 2194a63a818db71065ebe09c8104f5f021ca4e7b to < 2219e5f97244b79c276751a1167615b9714db1b0affected
  • 2194a63a818db71065ebe09c8104f5f021ca4e7b to < 1b4a8b89bf6787090b56424d269bf84ba00c3263affected
  • 2194a63a818db71065ebe09c8104f5f021ca4e7b to < 03c71c42809ef4b17f5d874cdb2d3bf40e847b86affected
  • 2194a63a818db71065ebe09c8104f5f021ca4e7b to < 39bc27bd688066a63e56f7f64ad34fae03fbe3b8affected

Linux Linux

Default version status: affected

  • 5.2affected
  • 0 to < 5.2unaffected
  • 5.10.229 to ≤ 5.10.*unaffected
  • 5.15.169 to ≤ 5.15.*unaffected
  • 6.1.114 to ≤ 6.1.*unaffected
  • 6.6.35 to ≤ 6.6.*unaffected
  • 6.9.6 to ≤ 6.9.*unaffected
  • 6.10 to ≤ *unaffected

References