# CVE-2026-74649: staging: rtl8723bs: fix missing shared-key auth challenge length check CVE-2026-74649 is fixed in 31 products on 1 platform, first by DEBIAN-CVE-2026-74649, released August 27, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-74649 - Priority: High - CVSS: 8.8 (Important) - EPSS: 0.0029 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Aug 22, 2026 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74649 ## Description 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool ol 8 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | bpftool ol 9 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-64kb sles 15.7 | 6.4.0-150700.53.90.1 | [SUSE-SU-2026:5091-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5091-1.md) | Nov 7, 2026 | | Linux | kernel-azure sles 15.7 | 6.4.0-150700.53.90.1 | [SUSE-SU-2026:5091-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5091-1.md) | Nov 7, 2026 | | Linux | kernel-default sles 15.7 | 6.4.0-150700.53.90.1 | [SUSE-SU-2026:5091-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5091-1.md) | Nov 7, 2026 | | Linux | kernel-default-base sles 15.7 | 6.4.0-150700.53.90.1.150700.17.51.1 | [SUSE-SU-2026:5091-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5091-1.md) | Nov 7, 2026 | | Linux | kernel-docs sles 15.7 | 6.4.0-150700.53.90.1 | [SUSE-SU-2026:5091-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5091-1.md) | Nov 7, 2026 | | Linux | kernel-livepatch-SLE15-SP7_Update_24 sles 15.7 | 1-150700.15.3.1 | [SUSE-SU-2026:5091-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5091-1.md) | Nov 7, 2026 | | Linux | kernel-obs-build sles 15.7 | 6.4.0-150700.53.90.1 | [SUSE-SU-2026:5091-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5091-1.md) | Nov 7, 2026 | | Linux | kernel-source sles 15.7 | 6.4.0-150700.53.90.1 | [SUSE-SU-2026:5091-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5091-1.md) | Nov 7, 2026 | | Linux | kernel-syms sles 15.7 | 6.4.0-150700.53.90.1 | [SUSE-SU-2026:5091-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5091-1.md) | Nov 7, 2026 | | Linux | kernel-uek ol 8 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek ol 9 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-container ol 8 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-container ol 9 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-container-debug ol 8 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-container-debug ol 9 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-core ol 8 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-core ol 9 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-debug ol 8 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-debug ol 9 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-debug-core ol 8 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-debug-core ol 9 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-debug-devel ol 8 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-debug-devel ol 9 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-debug-modules ol 8 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-debug-modules ol 9 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-debug-modules-extra ol 8 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-debug-modules-extra ol 9 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-devel ol 8 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-devel ol 9 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-doc ol 8 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-doc ol 9 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-modules ol 8 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-modules ol 9 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-modules-extra ol 8 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek-modules-extra ol 9 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek64k ol 8 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek64k ol 9 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek64k-core ol 8 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek64k-core ol 9 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek64k-devel ol 8 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek64k-devel ol 9 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek64k-modules ol 8 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek64k-modules ol 9 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek64k-modules-extra ol 8 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-uek64k-modules-extra ol 9 | 0:5.15.0-324.217.5.2.el9uek | [ELSA-2026-500249](https://patchblox.com/security/data/fix/linux/elsa-2026-500249.md) | Sep 4, 2026 | | Linux | kernel-zfcpdump sles 15.7 | 6.4.0-150700.53.90.1 | [SUSE-SU-2026:5091-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5091-1.md) | Nov 7, 2026 | | Linux | linux Debian 12.15 (bookworm) | 6.1.187-1 | [DEBIAN-CVE-2026-74649](https://patchblox.com/security/data/fix/linux/debian-cve-2026-74649.md) | Aug 27, 2026 | | Linux | linux Debian 13.5 (trixie) | 6.12.105-1 | [DEBIAN-CVE-2026-74649](https://patchblox.com/security/data/fix/linux/debian-cve-2026-74649.md) | Aug 27, 2026 | | Linux | linux Debian 14 | 7.1.9-1 | [DEBIAN-CVE-2026-74649](https://patchblox.com/security/data/fix/linux/debian-cve-2026-74649.md) | Aug 27, 2026 | | Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.107-1~deb12u1 | [DEBIAN-CVE-2026-74649](https://patchblox.com/security/data/fix/linux/debian-cve-2026-74649.md) | Aug 27, 2026 | --- Data as of 2026-11-08T13:06:02Z UTC. 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