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Vulnerability record · CVE-2026-64446 · published 25 July 2026

CVE-2026-64446: Linux kernel out-of-bounds write vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix heap buffer overflow in rtw_cfg80211_set_wpa_ie() supplicant_ie is a 256-byte array in struct security_priv. The WPA and WPA2 IE copy paths use: memcpy(padapter->securitypriv.supplicant_ie, &pwpa[0], wpa_ielen + 2); where wpa_ielen is the raw IE length field (u8, 0-255). When a local user supplies a connect request via nl80211 with a crafted WPA IE of length 255, wpa_ielen + 2 equals 257, overflowing the 256-byte buffer by one byte into the adjacent last_mic_err_time field. rtw_parse_wpa_ie() does not prevent this: its length consistency check compares *(wpa_ie+1) against (u8)(wpa_ie_len-2), which is (u8)(255) == 255 when wpa_ie_len = 257, so the check passes silently. Add explicit bounds checks for both the WPA and WPA2 paths before the memcpy, rejecting any IE whose total size (wpa_ielen + 2) exceeds the supplicant_ie buffer.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.1% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
3 Sep 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix heap buffer overflow in rtw_cfg80211_set_wpa_ie() supplicant_ie is a 256-byte array in struct security_priv. The WPA and WPA2 IE copy paths use: memcpy(padapter->securitypriv.supplicant_ie, &pwpa[0], wpa_ielen + 2); where wpa_ielen is the raw IE length field (u8, 0-255). When a local user supplies a connect request via nl80211 with a crafted WPA IE of length 255, wpa_ielen + 2 equals 257, overflowing the 256-byte buffer by one byte into the adjacent last_mic_err_time field. rtw_parse_wpa_ie() does not prevent this: its length consistency check compares *(wpa_ie+1) against (u8)(wpa_ie_len-2), which is (u8)(255) == 255 when wpa_ie_len = 257, so the check passes silently. Add explicit bounds checks for both the WPA and WPA2 paths before the memcpy, rejecting any IE whose total size (wpa_ielen + 2) exceeds the supplicant_ie buffer.

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/138cd190efd56ab36c9fdd8fef8749d06937f24b Patch
https://git.kernel.org/stable/c/2131621986c62c86109ce4d84cf73a73757eb8a6 Patch
https://git.kernel.org/stable/c/46f66c16a95191d9aca07a72ae6b1252a244e26c Patch
https://git.kernel.org/stable/c/5a752a616e756844388a1a45404db9fc29fec655 Patch
https://git.kernel.org/stable/c/5d7812360abf3143afcbf5efe4ef242448fa1f28 Patch
https://git.kernel.org/stable/c/6f20d7b0ee47c470734a69379b0fc6647c519603 Patch
https://git.kernel.org/stable/c/a94a643a80a84ceb8139061c3d6bf988d75e45a5 Patch
https://git.kernel.org/stable/c/b9c4bf133c3c47e23baf4f5403b98a953bf58606 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64446), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.