Description

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

netfilter: nftables: exthdr: fix 4-byte stack OOB write

If priv->len is a multiple of 4, then dst[len / 4] can write past
the destination array which leads to stack corruption.

This construct is necessary to clean the remainder of the register
in case ->len is NOT a multiple of the register size, so make it
conditional just like nft_payload.c does.

The bug was added in 4.1 cycle and then copied/inherited when
tcp/sctp and ip option support was added.

Bug reported by Zero Day Initiative project (ZDI-CAN-21950,
ZDI-CAN-21951, ZDI-CAN-21961).

Classification

CVE ID: CVE-2023-52628

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.05% (probability of being exploited)

EPSS Percentile: 18.43% (scored less or equal to compared to others)

EPSS Date: 2025-02-03 (when was this score calculated)

References

https://git.kernel.org/stable/c/28a97c43c9e32f437ebb8d6126f9bb7f3ca9521a
https://git.kernel.org/stable/c/cf39c4f77a773a547ac2bcf30ecdd303bb0c80cb
https://git.kernel.org/stable/c/a7d86a77c33ba1c357a7504341172cc1507f0698
https://git.kernel.org/stable/c/1ad7b189cc1411048434e8595ffcbe7873b71082
https://git.kernel.org/stable/c/d9ebfc0f21377690837ebbd119e679243e0099cc
https://git.kernel.org/stable/c/c8f292322ff16b9a2272a67de396c09a50e09dce
https://git.kernel.org/stable/c/fd94d9dadee58e09b49075240fe83423eb1dcd36

Timeline