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 543D63A7F5E for ; Sun, 19 Jul 2026 15:43:21 +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=1784475802; cv=none; b=R11nvEGORMM6drjneP2cBffOVbpw33R2f2b+04Fa/oLI2t1CzZGQiB2px17l3JLyteLPmwRE32BG4rh4YgBcEe//Rn3451sBioclVVuiPfz0GZQ7yq4NCwbhj6xWqmgC1BRr+iUjaOzRj3wqx+l9AUV9zPDBbGB1yeUYYgbwF4o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784475802; c=relaxed/simple; bh=SEUO05TIfUPhwj5Rlo+PhtFpdEgf9c8O4XorzlIIR9M=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=YDefWH2arzSRtERMB3H6QlTBkLsqqtMZZtJiy96wg/fLVLkP70yTGEJBYd6r0n/Oj3YVS4FPTcy7n3L46w5RRzY2LkgIjd0UmT8vWsHIkT9h4e4BdpIHPyuA6fJ9h9nXjlZrasbI8vwhg3JpJo56SxVWrCilvSGjzqsHhL592Cg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=b/R0erop; 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="b/R0erop" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ABDE01F000E9; Sun, 19 Jul 2026 15:43:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784475801; bh=tfYzqH4PakQQTRG67KxluGNI/BK48gjLTGAEb+3C3Zw=; h=From:To:Cc:Subject:Date:Reply-To; b=b/R0eropPTXETVzIYHEsBeL+NUcllzDF2MwpNmnsrQFqJJ2DqxaKNGCJi5yzqwFmt 5Bsq3/voH/T903GmszGA+njDlvIjpyzhVez+cLdtU03ocTRuZZsDhZvyIptmtRgiPd 1mmq7OAkYEggIa96b8xeD9u18Q/bbAzVFqbwT8qY= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-64053: block: don't overwrite bip_vcnt in bio_integrity_copy_user() Date: Sun, 19 Jul 2026 17:38:35 +0200 Message-ID: <2026071909-CVE-2026-64053-29c0@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=2688; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=73L9xAd5MPTxwmSLTVYTpyNbZmtIHMOeooMjDPe9n4s=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkx7xMlZk+zt/CZrp64ZW77DsFFIjMFz0XdWcmZzRhzS bmuoc+rI5aFQZCJQVZMkeXLNp6j+ysOKXoZ2p6GmcPKBDKEgYtTACZys5ZhDi+/CMfGlxJBZc9E ow2/xYkXsx/IYJiftPfR9oU7tMpW7uNXLFlRaZrgVlsCAA== 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: block: don't overwrite bip_vcnt in bio_integrity_copy_user() bio_integrity_add_page() already sets bip_vcnt to 1 for the bounce segment. Overwriting it with nr_vecs breaks bip_vcnt <= bip_max_vcnt on WRITE (bip_max_vcnt is 1), so the gap-merge checks in block/blk.h read past the bip_vec[] flex array. On READ the read is in bounds but lands on a saved user bvec instead of the bounce. The line was added for split propagation, but bio_integrity_clone() doesn't copy bip_vcnt and BIP_CLONE_FLAGS excludes BIP_COPY_USER. The Linux kernel CVE team has assigned CVE-2026-64053 to this issue. Affected and fixed versions =========================== Issue introduced in 6.11 with commit 3991657ae7074c3c497bf095093178bed37ea1b4 and fixed in 6.12.92 with commit d18160c9525c63c203656fefd847e94b538cd4a4 Issue introduced in 6.11 with commit 3991657ae7074c3c497bf095093178bed37ea1b4 and fixed in 6.18.34 with commit 0d48654af4d1390c888389206cc13b51b82c30e6 Issue introduced in 6.11 with commit 3991657ae7074c3c497bf095093178bed37ea1b4 and fixed in 7.0.11 with commit 066be1439593a381b1a29663becfcfe0c92363e7 Issue introduced in 6.11 with commit 3991657ae7074c3c497bf095093178bed37ea1b4 and fixed in 7.1 with commit 637ad3a56a3b889527d1dacea6fea2a8bd648140 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-2026-64053 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: block/bio-integrity.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/d18160c9525c63c203656fefd847e94b538cd4a4 https://git.kernel.org/stable/c/0d48654af4d1390c888389206cc13b51b82c30e6 https://git.kernel.org/stable/c/066be1439593a381b1a29663becfcfe0c92363e7 https://git.kernel.org/stable/c/637ad3a56a3b889527d1dacea6fea2a8bd648140