CVE-2025-38162netfilter: nft_set_pipapo: prevent overflow in lookup table allocation

Official 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().

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/91edc076439c9e2f34b176149f1c84a47a8ec32f
• https://git.kernel.org/stable/c/a9e757473561da93c6a4136f0e59aba91ec777fc
• https://git.kernel.org/stable/c/c1360ac8156c0a3f2385baef91d8d26fd9d39701
• https://git.kernel.org/stable/c/43fe1181f738295624696ae9ff611790edb65b5e
• https://git.kernel.org/stable/c/4c5c6aa9967dbe55bd017bb509885928d0f31206
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html