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 3DCF858FD0C for ; Fri, 11 Sep 2026 20:05:38 +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=1789157143; cv=none; b=MjoOtcplZQZJoUF3eGZSmdPmVCNOInF5J0MfzMp+BZlkNz2PkRl5ouvi9sIwHScJXxi9hhhdJMm4kuqStdrMMeMZeZaPi3CWlGBdQ+OK1Mqcu2a8RLBxjmXvXXSYbs8MT7yy+jAwH7gFRPhj0Gu31pGOcCzvVjjTp1tyDqk3Z2Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789157143; c=relaxed/simple; bh=4ww6fqGGUQWDejGN5kOHjpCrQgfoIf88WwXKj+9BXtk=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=XAUcyCJAhGHi6MDqiU7MBbNTEEbmwu+icXF3Ge58k0wxMi9iZzq4pYfm5jGUGa+JVjYO5AzlWPcAttco5eSFSGmXK5f8L7U2pmTztgn3PtVNhdZkeJeUKL59tNpENX7+Upoit04kb/TdtRGMfP2WdqKMexyKvU7JNBF7OG9aUmg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=QPx9MIfA; 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="QPx9MIfA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2C8231F00893; Fri, 11 Sep 2026 20:05:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789157136; bh=Nbh9lNu9URhvB4enCZ5mtjwV1dekhfNToUpN5YOSVfM=; h=From:To:Cc:Subject:Date:Reply-To; b=QPx9MIfArloWPigB+ocoh2+MfCxWWNQvbCQWi4iWJEPWNpcFpbRF+QOicWAyKc/FO 4hU3ov/TGFPssVu3kXalR9kuGOTVaIFLkBVN5e79zNSVBXn7vAo3tFJnOLUtW6nYfS trggs/lXThUzEER6pj/Qwj7R24LrIpKdPDLQmgaY= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-89749: tracing: Fix crash passing ERR_PTR to kthread_stop() Date: Fri, 11 Sep 2026 21:47:18 +0200 Message-ID: <2026091106-CVE-2026-89749-7161@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=2880; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=m0QpBbUnE590Xom7roinq2B1QUy+x7kJAcsF/W15AKk=; b=owGbwMvMwCRo6H6F97bub03G02pJDFlLIvuS+Z18u9gsf0bu4V8y2at7R+F/+yeCh5fe79//U Lvk3avijlgWBkEmBlkxRZYv23iO7q84pOhlaHsaZg4rE8gQBi5OAZiIfAfDgtaKwqYNcx6YPH9t f4JLe9+C7SlmvxgWnPgoXVkuvuHlkYaHs2W2NGl8FIo5DgA= 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: tracing: Fix crash passing ERR_PTR to kthread_stop() event_test_stuff() calls kthread_run() and unconditionally passes the returned task_struct pointer to kthread_stop(). kthread_run() returns an error pointer such as ERR_PTR(-ENOMEM) when kthread creation fails, for example under memory pressure during the boot-time event self-test. kthread_stop() then dereferences the invalid pointer, crashing the kernel. Check the result of kthread_run() before passing it to kthread_stop(). Use WARN_ON() so that a failure to create the self-test thread does not go unnoticed, matching the ring-buffer self-test fix in commit 91542863abad ("ring-buffer: Fix crash passing ERR_PTR to kthread_stop()"). The Linux kernel CVE team has assigned CVE-2026-89749 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.31 with commit e6187007d6c365b551c69ea3df46f06fd1c8bd19 and fixed in 6.12.109 with commit 12a499f741fc5be3731c8b0a0d909406575cc2eb Issue introduced in 2.6.31 with commit e6187007d6c365b551c69ea3df46f06fd1c8bd19 and fixed in 6.18.50 with commit adadf4192f700bca82abfda9fa6d58c0bf37cc04 Issue introduced in 2.6.31 with commit e6187007d6c365b551c69ea3df46f06fd1c8bd19 and fixed in 7.2.4 with commit c40e0b4fa365969e67011529eabdfb66d1022256 Issue introduced in 2.6.31 with commit e6187007d6c365b551c69ea3df46f06fd1c8bd19 and fixed in 7.3-rc1 with commit 649bc7df3e5d7be6f7996a95084037dbf3cad1e5 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-2026-89749 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: kernel/trace/trace_events.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/12a499f741fc5be3731c8b0a0d909406575cc2eb https://git.kernel.org/stable/c/adadf4192f700bca82abfda9fa6d58c0bf37cc04 https://git.kernel.org/stable/c/c40e0b4fa365969e67011529eabdfb66d1022256 https://git.kernel.org/stable/c/649bc7df3e5d7be6f7996a95084037dbf3cad1e5