CVE-2024-39497

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux2194a63a818db71065ebe09c8104f5f021ca4e7b < a508a102edf8735adc9bb73d37dd13c38d1a1b10affected
LinuxLinux2194a63a818db71065ebe09c8104f5f021ca4e7b < 3ae63a8c1685e16958560ec08d30defdc5b9cca0affected
LinuxLinux2194a63a818db71065ebe09c8104f5f021ca4e7b < 2219e5f97244b79c276751a1167615b9714db1b0affected
LinuxLinux2194a63a818db71065ebe09c8104f5f021ca4e7b < 1b4a8b89bf6787090b56424d269bf84ba00c3263affected
LinuxLinux2194a63a818db71065ebe09c8104f5f021ca4e7b < 03c71c42809ef4b17f5d874cdb2d3bf40e847b86affected
LinuxLinux2194a63a818db71065ebe09c8104f5f021ca4e7b < 39bc27bd688066a63e56f7f64ad34fae03fbe3b8affected
LinuxLinux5.2affected
LinuxLinux0 < 5.2unaffected
LinuxLinux5.10.229 <= 5.10.*unaffected
LinuxLinux5.15.169 <= 5.15.*unaffected
LinuxLinux6.1.114 <= 6.1.*unaffected
LinuxLinux6.6.35 <= 6.6.*unaffected
LinuxLinux6.9.6 <= 6.9.*unaffected
LinuxLinux6.10 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References