From patchwork Mon Aug 24 04:21:20 2026 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Junjie Cao X-Patchwork-Id: 96121 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id E2B01C5DF8C for ; Mon, 24 Aug 2026 02:23:12 +0000 (UTC) Received: from mta0.migadu.com (mta0.migadu.com [91.218.175.94]) by mx.groups.io with SMTP id smtpd.msgproc01-g2.8454.1787538190246982376 for ; Sun, 23 Aug 2026 19:23:10 -0700 Authentication-Results: mx.groups.io; dkim=pass header.i=@linux.dev header.s=key1 header.b=H7bXPWX0; spf=pass (domain: linux.dev, ip: 91.218.175.94, mailfrom: junjie.cao@linux.dev) X-Envelope-To: openembedded-core@lists.openembedded.org DKIM-Signature: a=rsa-sha256; bh=pGsGDpWg+aHZqf4+4vY7kYtTtruOeEcGmceQZURz7Nc=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1787538188; v=1; x=1788142988; b=H7bXPWX0S8/bu9LF6a7oS/rCF2AeI/ij/MYF9+8FdaEQMFuFvH91p69bmBeuir02QIenaaOY uEKHwrdeaxdXTvyUOdyc2O6G0E0XB9+eyyxSy2sxhv/4cfE1sF+f/bizMweJrDu0vhyPWD8RVFj lqOifujc4qVEKSg5oGz8NjJ4= X-Envelope-To: openembedded-core@lists.openembedded.org Received: from localhost (2408:8806:52:f8ea:5de6:8d95:1672:70f3) by smtp.migadu.com with ESMTPS id a42adbead9210cca; Mon, 24 Aug 2026 02:23:08 +0000 X-Mizu-Trace-ID: a42adbead9210cca X-Migadu-Flow: FLOW_OUT From: Junjie Cao To: openembedded-core@lists.openembedded.org Cc: paul@pbarker.dev Subject: [OE-core][PATCH v4 5/8] cve-exclusions: set status for CVE-2022-4543 Date: Sun, 23 Aug 2026 23:21:20 -0500 Message-ID: <20260824042123.1456876-6-junjie.cao@linux.dev> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260824042123.1456876-1-junjie.cao@linux.dev> References: <20260824042123.1456876-1-junjie.cao@linux.dev> MIME-Version: 1.0 List-Id: X-Webhook-Received: from 45-33-107-173.ip.linodeusercontent.com [45.33.107.173] by aws-us-west-2-korg-lkml-1.web.codeaurora.org with HTTPS for ; Mon, 24 Aug 2026 02:23:12 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/244051 KPTI clones the kernel entry text into the user page tables at its KASLR-slid address and, on CPUs with PGE, sets the global bit on those entries. The translation survives the CR3 write on kernel exit, and a local attacker can time prefetch instructions across the kernel range to recover the KASLR base in under a second. Disclosure and write-up: https://www.openwall.com/lists/oss-security/2022/12/16/3 https://www.willsroot.io/2022/12/entrybleed.html The disclosure states that after discussion with security@kernel.org and linux-distros "a fix for this is currently not available", and none has appeared since; arch/x86/mm/pti.c still clones the entry text and sets _PAGE_GLOBAL on the cloned mapping. Debian notes "Ignored upstream and KASLR is not expected to be resistant to local attacks"; Ubuntu has the fix deferred since 2023-01-10: https://security-tracker.debian.org/tracker/CVE-2022-4543 https://ubuntu.com/security/CVE-2022-4543 CC: Paul Barker AI-Generated: Uses Claude (claude-opus-5) Signed-off-by: Junjie Cao --- v4: - use the review's comment and status wording; drop the cpu_entry_area commit reference - tighten the mechanism wording and the timing claim to match the cited sources v3: https://lore.kernel.org/openembedded-core/20260812072842.1176341-1-junjie.cao@linux.dev/ meta/recipes-kernel/linux/cve-exclusion.inc | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/meta/recipes-kernel/linux/cve-exclusion.inc b/meta/recipes-kernel/linux/cve-exclusion.inc index a9b4d9a2..4318fc79 100644 --- a/meta/recipes-kernel/linux/cve-exclusion.inc +++ b/meta/recipes-kernel/linux/cve-exclusion.inc @@ -222,3 +222,12 @@ CVE_STATUS[CVE-2021-3864] = "unpatched: Proposed fixes were not merged upstream" # Fix https://git.kernel.org/linus/d860d1faa6b2ce3becfdb8b0c2b048ad31800061 # Fix https://git.kernel.org/linus/da9c9c877597170b929a6121a68dcd3dd9a80f45 CVE_STATUS[CVE-2022-1247] = "fixed-version: Fixed from version 6.17" + +# Triaged August 2026 - "EntryBleed", discussed with the kernel security team +# but no fix appears to have been published since then. Debian says "Ignored +# upstream and KASLR is not expected to be resistant to local attacks", fix +# deferred in Ubuntu. +# https://www.openwall.com/lists/oss-security/2022/12/16/3 +# https://security-tracker.debian.org/tracker/CVE-2022-4543 +# https://ubuntu.com/security/CVE-2022-4543 +CVE_STATUS[CVE-2022-4543] = "unpatched: No fix has been proposed"