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 E2ADE3A3812 for ; Sun, 19 Jul 2026 15:03:59 +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=1784473441; cv=none; b=fValBR4ioMm717EgToDxKnErCUZg4ifdPDjJAaPrQVYX5oYEw3AVFdXENTYPf8k0F1SMkGN7Mi/mp2zj+rc6OlltykzQWETxthYumDdMXqzo626i3C7ujR172P4sPK+pMdLPAlHauFtEUApUaKPF+3/4gFYmDXFlEy+SrzQjxuc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784473441; c=relaxed/simple; bh=djLj/gkroXy93bXDXao8XeKNf3/vVudMond1Ydx7yIo=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=PidStoSA4h/jLf+YiQj77KGDX+yckQM9sCQq+4BgDZZ43t1zas/UG/6s/jdAUtMwyatg0wWQCHp+Zdnla/3vB+1hDE8lcGva4thId4E4kkw9aboiYRps5k+xGLpxTMtx8FG3fURCun7PcvAGWnEMSW+xcBwBIWxrXGRfoEjp8Q4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=sZhed20G; 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="sZhed20G" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4DAC41F000E9; Sun, 19 Jul 2026 15:03:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784473439; bh=1SsVINEnseXU3bGepc+XHFRSVaeQQBpd4GA51ujhVJI=; h=From:To:Cc:Subject:Date:Reply-To; b=sZhed20G42ACaSUT42dfmOHuKs+I2YYvYuJODmsiy65qIQhaRoNih843xtUGQk7B0 7lllMNaqu3trb/bDEAb96DsuEZp5Igj9/hbMxhXRkFN6jrWXiz3ik4CNh6dzs/a3IU RqejFydEe5BnubANCdNpTE4BLLG5bBhwEmI8+AWE= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-63995: ethtool: cmis: validate start_cmd_payload_size from module Date: Sun, 19 Jul 2026 16:57:35 +0200 Message-ID: <2026071905-CVE-2026-63995-a31c@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=2763; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=o/h+qyuweOtl0v2I8KMaaEc5Emel3nW11RDaR0bfyGk=; b=kA0DAAIRMUfUDdst+ykByyZiAGpc5YWjV4NutTE7vMS2/DRXwj/m3uLZrChlmK+7lxdlX0EQw ohdBAARAgAdFiEE9LYMxb94wiFKMT3LMUfUDdst+ykFAmpc5YUACgkQMUfUDdst+ymA3QCfVmBC Sw9fEipNLTcyJEp4YiomhOEAni0vwCTKuMca9+MBQXbrCc+DSTyt 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: ethtool: cmis: validate start_cmd_payload_size from module The CMIS firmware update code reads start_cmd_payload_size from the module's FW Management Features CDB reply and uses it directly as the byte count for memcpy. The destination buffer is 112 bytes (ETHTOOL_CMIS_CDB_LPL_MAX_PL_LENGTH - 8). So a malicious module (or corrupted response) can cause a OOB write later on in cmis_fw_update_start_download(). Let's error out. If modules that expect longer LPL writes actually exist we should revisit. struct cmis_cdb_start_fw_download_pl's definition has to move, no change there. The Linux kernel CVE team has assigned CVE-2026-63995 to this issue. Affected and fixed versions =========================== Issue introduced in 6.11 with commit c4f78134d45c9619339c96b4bea380b1d0699788 and fixed in 6.12.93 with commit 63112b4515469d00008452d9cfe3fb3bf1aa2df3 Issue introduced in 6.11 with commit c4f78134d45c9619339c96b4bea380b1d0699788 and fixed in 6.18.35 with commit 0696709e951be54c699664adf546d16e28974d53 Issue introduced in 6.11 with commit c4f78134d45c9619339c96b4bea380b1d0699788 and fixed in 7.0.12 with commit a46340da00385be7fb16c62425ebc20006f2d5d8 Issue introduced in 6.11 with commit c4f78134d45c9619339c96b4bea380b1d0699788 and fixed in 7.1 with commit 12c2496a71f82f63617971ca9b730dffa05cf58b 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-2026-63995 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/ethtool/cmis_fw_update.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/63112b4515469d00008452d9cfe3fb3bf1aa2df3 https://git.kernel.org/stable/c/0696709e951be54c699664adf546d16e28974d53 https://git.kernel.org/stable/c/a46340da00385be7fb16c62425ebc20006f2d5d8 https://git.kernel.org/stable/c/12c2496a71f82f63617971ca9b730dffa05cf58b