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Vulnerability record · CVE-2023-53570 · published 4 October 2025

CVE-2023-53570: Linux kernel integer overflow vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: wifi: nl80211: fix integer overflow in nl80211_parse_mbssid_elems() nl80211_parse_mbssid_elems() uses a u8 variable num_elems to count the number of MBSSID elements in the nested netlink attribute attrs, which can lead to an integer overflow if a user of the nl80211 interface specifies 256 or more elements in the corresponding attribute in userspace. The integer overflow can lead to a heap buffer overflow as num_elems determines the size of the trailing array in elems, and this array is thereafter written to for each element in attrs. Note that this vulnerability only affects devices with the wiphy->mbssid_max_interfaces member set for the wireless physical device struct in the device driver, and can only be triggered by a process with CAP_NET_ADMIN capabilities. Fix this by checking for a maximum of 255 elements in attrs.

7.8 CVSS 3.1 High EPSS 0.17% · top 94.7% CWE-190 · Integer overflow
7.8CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
4 Aug 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: nl80211: fix integer overflow in nl80211_parse_mbssid_elems() nl80211_parse_mbssid_elems() uses a u8 variable num_elems to count the number of MBSSID elements in the nested netlink attribute attrs, which can lead to an integer overflow if a user of the nl80211 interface specifies 256 or more elements in the corresponding attribute in userspace. The integer overflow can lead to a heap buffer overflow as num_elems determines the size of the trailing array in elems, and this array is thereafter written to for each element in attrs. Note that this vulnerability only affects devices with the wiphy->mbssid_max_interfaces member set for the wireless physical device struct in the device driver, and can only be triggered by a process with CAP_NET_ADMIN capabilities. Fix this by checking for a maximum of 255 elements in attrs.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/6311071a056272e1e761de8d0305e87cc566f734 Patch
https://git.kernel.org/stable/c/7d09f9f255a5f78578deba5454923072bb53b16c Patch
https://git.kernel.org/stable/c/e642eb67b8c10dcce758d549cc81564116e0fa49 Patch

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Source: NIST National Vulnerability Database (record CVE-2023-53570), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.