CVE-2025-38162 Information

Jul 04, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

netfilter: nft_set_pipapo: prevent overflow in lookup table allocation

When calculating the lookup table size ensure the following multiplication does not overflow:

  • desc->field_len[] maximum value is U8_MAX multiplied by NFT_PIPAPO_GROUPS_PER_BYTE(f) that can be 2 worst case.
  • NFT_PIPAPO_BUCKETS(f->bb) is 2^8 worst case.
  • sizeof(unsigned long) from sizeof(f->lt) lt in struct nft_pipapo_field.

Then use check_mul_overflow() to multiply by bucket size and then use check_add_overflow() to the alignment for avx2 (if needed). Finally add lt_size_check_overflow() helper and use it to consolidate this.

While at it replace leftover allocation using the GFP_KERNEL to GFP_KERNEL_ACCOUNT for consistency in pipapo_resize().

Reference

https://git.kernel.org/stable/c/43fe1181f738295624696ae9ff611790edb65b5e https://git.kernel.org/stable/c/4c5c6aa9967dbe55bd017bb509885928d0f31206 https://git.kernel.org/stable/c/c1360ac8156c0a3f2385baef91d8d26fd9d39701

CNNVD-202507-246 (Published: 2025-07-03)

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