CVE-2024-39477

Summary

In the Linux kernel, the following vulnerability has been resolved:

mm/hugetlb: do not call vma_add_reservation upon ENOMEM

sysbot reported a splat [1] on __unmap_hugepage_range(). This is because vma_needs_reservation() can return -ENOMEM if allocate_file_region_entries() fails to allocate the file_region struct for the reservation.

Check for that and do not call vma_add_reservation() if that is the case, otherwise region_abort() and region_del() will see that we do not have any file_regions.

If we detect that vma_needs_reservation() returned -ENOMEM, we clear the hugetlb_restore_reserve flag as if this reservation was still consumed, so free_huge_folio() will not increment the resv count.

[1] https://lore.kernel.org/linux-mm/0000000000004096100617c58d54@google.com/T/#ma5983bc1ab18a54910da83416b3f89f3c7ee43aa

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxdf7a6d1f64056aec572162c5d35ed9ff86ece6f3 < aa998f9dcb34c28448f86e8f5490f20d5eb0eac7affected
LinuxLinuxdf7a6d1f64056aec572162c5d35ed9ff86ece6f3 < 8daf9c702ee7f825f0de8600abff764acfedea13affected
LinuxLinux6.9affected
LinuxLinux0 < 6.9unaffected
LinuxLinux6.9.5 <= 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