CVE-2026-74649staging: rtl8723bs: fix missing shared-key auth challenge length check
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix missing shared-key auth challenge length check The WEP shared-key authentication handler uses the challenge-text element's attacker-controlled length without checking it against the fixed 128-byte chg_txt buffer. In OnAuthClient() the length from rtw_get_ie() - up to 255 - is used to perform memcpy() into the 128-byte pmlmeinfo->chg_txt, so a malicious AP sending a malformed WLAN_EID_CHALLENGE element can overflow/underfill chg_txt by up to 127 bytes. It is reachable over the air, before association, during shared-key authentication. In the case of an overflow, the driver can write out of bounds. In the case of an underfill, the driver can echo stale buffer memory. The challenge text is defined to be exactly 128 octets, which is already provided as the WLAN_AUTH_CHALLENGE_LEN define; require the element to be exactly that length before use.
- CVSS
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 554c0a3abf216c991c5ebddcdb2c08689ecd290b builds before 39ae1033071001af9bb4573ebdbb43bbbe88f749; 554c0a3abf216c991c5ebddcdb2c08689ecd290b builds before 4d018e7d7d908bdfcb5ecfa922b1d5cb9ddb3722; 554c0a3abf216c991c5ebddcdb2c08689ecd290b builds before 4ba402fd47009d20e51dbfc934abb562098ea35b; 554c0a3abf216c991c5ebddcdb2c08689ecd290b builds before 87c2f073d2aaea041d531b8e579c47570b54b3b7; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b before a28a4b0592e4a37ea471bc0d308513a93133ce7e; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b before 6235b5156b48ed5d1ce3410d8f0b2fd67d30d944; 554c0a3abf216c991c5ebddcdb2c08689ecd290b builds before 2c56ef658ac8c6bca36bc5574715e8f717207c6c | CNA record |
References
- https://git.kernel.org/stable/c/39ae1033071001af9bb4573ebdbb43bbbe88f749
- https://git.kernel.org/stable/c/4d018e7d7d908bdfcb5ecfa922b1d5cb9ddb3722
- https://git.kernel.org/stable/c/4ba402fd47009d20e51dbfc934abb562098ea35b
- https://git.kernel.org/stable/c/87c2f073d2aaea041d531b8e579c47570b54b3b7
- https://git.kernel.org/stable/c/a28a4b0592e4a37ea471bc0d308513a93133ce7e
- https://git.kernel.org/stable/c/6235b5156b48ed5d1ce3410d8f0b2fd67d30d944
- https://git.kernel.org/stable/c/2c56ef658ac8c6bca36bc5574715e8f717207c6c
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.