From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E1DA44AD4CE for ; Thu, 24 Sep 2026 16:07:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790266065; cv=none; b=b/oD+F/wbOSxKI6dZbEFdsk9j7fMPgs9E4ILwTBU9lQGdjTr9QxANyhR//05EeS8b/78g8ONQHXv6FtOoQKwQlgPJSWd1/lAolHtO+8vhv9cjbA7LQJxnIX4LAaiyRklFfx6ChV4XZycLSybAiwVMIuksff6ijR5DW4Wsl9fXtE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790266065; c=relaxed/simple; bh=6khHNu6bZ/+5YHHJlACUdjYaV9DRbTF7/cJeoeQnmXU=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=E7kFwpz/n8ySmBTCI3nJDo4SzJd0lXg4imLYMxjd/qENyP+oEGYn+OkMkQBozxX0ix5HSBf5fidl1xHGDJeHgb8U2fYKRqXIIiTXFDTHr3k7TAjlikvQpbu+2XUT1HXNZpoFBQy8jJuC7VGz0G9EKbUhAgDHu/wgwNvrFfI8y9Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=cqIsaBoF; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="cqIsaBoF" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0920F1F00893; Thu, 24 Sep 2026 16:07:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790266063; bh=abUe+PlEVegk6Wku3lk+UvVSKY/PeAdFm/xFSLapo4E=; h=From:To:Cc:Subject:Date:Reply-To; b=cqIsaBoFrjB5JQzltmWrjpgi/xIKFsrTgAjaOMTO3VR9ReIF/yB8BWeDuoQ9PEhJW xkMYi+ZlpSJtvzEooFVS13M17j4YMr/Ro9uE3vf5mq/OL4XRXUHd/6hK69/7k6iAXo rTg8/YRYdWyFbnx/i2gPTcMniWV/eao/O3GWtens= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-93784: wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie() Date: Thu, 24 Sep 2026 18:02:20 +0200 Message-ID: <2026092415-CVE-2026-93784-e250@gregkh> X-Mailer: git-send-email 2.55.0 Reply-To: , Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2528; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=vrizrUSYVmEXXkCJ9R/WOIoqRSewqnjBQhlW/jz7/rM=; b=owGbwMvMwCRo6H6F97bub03G02pJDFlbPdu3HxPV5kzgNnv/N21p1xXvaRzWYTvtXBMtD8j99 Nf4yHmuI5aFQZCJQVZMkeXLNp6j+ysOKXoZ2p6GmcPKBDKEgYtTACZitpNhfuUH4YWTEkJzPrhM /Li9p1XYcZpKJcOCBgOHetuq6hWWGp5tG012r6t6y34JAA== X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit From: Greg Kroah-Hartman Description =========== In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie() The KASAN allocation trace shows that a malformed IE buffer is stored via SIOCSIWGENIE (cfg80211_wext_siwgenie()) without any validation. The crash trace shows that a subsequent SIOCSIWESSID triggers a connection attempt which calls cfg80211_sme_get_conn_ies() to process the stored IE buffer, causing: - An out-of-bounds read in skip_ie() which reads ies[pos+1] (the length byte) past the end of the 1-byte buffer. - An integer underflow in the memcpy size argument when offs returned by ieee80211_ie_split() exceeds ies_len, causing unsigned subtraction to wrap to SIZE_MAX and triggering a fortify panic. Fix this by validating the IE buffer in cfg80211_wext_siwgenie() before storing it. [drop unnecessary ie_len check, update commit message] The Linux kernel CVE team has assigned CVE-2026-93784 to this issue. Affected and fixed versions =========================== Fixed in 6.12.111 with commit c970879e03b23a27df42caf7ba506485a165fb96 Fixed in 6.18.53 with commit 01cc395cecfaa73134d39fb9a401d9605d8bb2c5 Fixed in 7.2 with commit a2f5286ca4f304d3fd469f01b96b518608912a5c Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2026-93784 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: net/wireless/wext-sme.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/c970879e03b23a27df42caf7ba506485a165fb96 https://git.kernel.org/stable/c/01cc395cecfaa73134d39fb9a401d9605d8bb2c5 https://git.kernel.org/stable/c/a2f5286ca4f304d3fd469f01b96b518608912a5c