# CVE-2025-38162

## Summary

- **CVE ID:** CVE-2025-38162
- **Severity:** HIGH
- **CVSS Score:** 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Jul 3, 2025
- **Last Modified:** Sep 8, 2026

## 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 Products

- Linux — Linux (3c4287f62044a90e73a561aa05fc46e62da173da)
- Linux — Linux (5.6)
- Linux — Linux (0)
- Linux — Linux (6.6.125)
- Linux — Linux (6.12.34)
- Linux — Linux (6.15.3)
- Linux — Linux (6.16)
- Linux — Linux (6.1.167)

## References

- [CNA](https://git.kernel.org/stable/c/a9e757473561da93c6a4136f0e59aba91ec777fc)
- [CNA](https://git.kernel.org/stable/c/c1360ac8156c0a3f2385baef91d8d26fd9d39701)
- [CNA](https://git.kernel.org/stable/c/43fe1181f738295624696ae9ff611790edb65b5e)
- [CNA](https://git.kernel.org/stable/c/4c5c6aa9967dbe55bd017bb509885928d0f31206)
- [CNA](https://git.kernel.org/stable/c/91edc076439c9e2f34b176149f1c84a47a8ec32f)
- [siemens-SADP](https://cert-portal.siemens.com/productcert/html/ssa-082556.html)
- [siemens-SADP](https://cert-portal.siemens.com/productcert/html/ssa-019113.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.16%
- **EPSS Percentile:** 5.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._