From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 1C7853F0ABA for ; Fri, 8 May 2026 14:27:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778250438; cv=none; b=YkOY3BjBWpac6fF8h8yRiqbQqjJxbcnYiCgu4fm1ZIzc2KO4SpLAAhsPqgLpKHtD9sMRzJeIYf0o6qaLi/4HOxiKDfsscREWv2JCr43feVul3jVHp1QmfT5tUlh3qUQSPcRfdyKVdluyVHHnamL/x8ohhHfAd2ZE2cuE2o5nEDU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778250438; c=relaxed/simple; bh=pBWaBBPkxktnLa4o5NYTXozfQinHw+YilSXi/DrBvc0=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=W32Gpk1xjhD7/27CvOZgaQKCZ5NgYaTvsBbCgpwOHxGdId1GVnSMEeDPgTiZKopIPsQqVAPmTh57oz+RajizWU0xXT94/8B02L9msbxWawToeupCAugceO28a1pny6IP7nuxJSBuAkjJ28M/Z+hZuGeV/ATr8yiYG3KviMjHE9M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=N14eEU2i; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="N14eEU2i" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A664CC2BCB0; Fri, 8 May 2026 14:27:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1778250438; bh=pBWaBBPkxktnLa4o5NYTXozfQinHw+YilSXi/DrBvc0=; h=From:To:Cc:Subject:Date:Reply-To:From; b=N14eEU2iH8JBf/FOZIvDXAt9DeBinQtHPM2PHP2f4t70nQG+JdJhjy1pDvFGe5s9W Igq3mh/CEdEbeUArW7/A4H+XvfBXz0lkX09NH8EIX6M6VW2h3U3nSJwZZmOMw3GMZR SFsz1i8adzDc0u9OYOuEgYsBlPWkcZue5oQv4tow= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-43475: scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT Date: Fri, 8 May 2026 16:23:24 +0200 Message-ID: <2026050806-CVE-2026-43475-8f81@gregkh> X-Mailer: git-send-email 2.54.0 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=6594; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=jGX8DpVyYUZ+yogGdM5QGCraEL3dF9qZynvcgTeJxmg=; b=owGbwMvMwCRo6H6F97bub03G02pJDJl/P/Z93T5zr3BXs/Gd47E6an93sFi2/K+95VR//l94h z1H4ASGjlgWBkEmBlkxRZYv23iO7q84pOhlaHsaZg4rE8gQBi5OAZjIxr0MC+Zq/imwZM8Xi27R uNBw3jjUL6htBsP8yJ437u+OhZ+7wFz0PKrWvkHqU2UPAA== 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: scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT This resolves the follow splat and lock-up when running with PREEMPT_RT enabled on Hyper-V: [ 415.140818] BUG: scheduling while atomic: stress-ng-iomix/1048/0x00000002 [ 415.140822] INFO: lockdep is turned off. [ 415.140823] Modules linked in: intel_rapl_msr intel_rapl_common intel_uncore_frequency_common intel_pmc_core pmt_telemetry pmt_discovery pmt_class intel_pmc_ssram_telemetry intel_vsec ghash_clmulni_intel aesni_intel rapl binfmt_misc nls_ascii nls_cp437 vfat fat snd_pcm hyperv_drm snd_timer drm_client_lib drm_shmem_helper snd sg soundcore drm_kms_helper pcspkr hv_balloon hv_utils evdev joydev drm configfs efi_pstore nfnetlink vsock_loopback vmw_vsock_virtio_transport_common hv_sock vmw_vsock_vmci_transport vsock vmw_vmci efivarfs autofs4 ext4 crc16 mbcache jbd2 sr_mod sd_mod cdrom hv_storvsc serio_raw hid_generic scsi_transport_fc hid_hyperv scsi_mod hid hv_netvsc hyperv_keyboard scsi_common [ 415.140846] Preemption disabled at: [ 415.140847] [] storvsc_queuecommand+0x2e1/0xbe0 [hv_storvsc] [ 415.140854] CPU: 8 UID: 0 PID: 1048 Comm: stress-ng-iomix Not tainted 6.19.0-rc7 #30 PREEMPT_{RT,(full)} [ 415.140856] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 09/04/2024 [ 415.140857] Call Trace: [ 415.140861] [ 415.140861] ? storvsc_queuecommand+0x2e1/0xbe0 [hv_storvsc] [ 415.140863] dump_stack_lvl+0x91/0xb0 [ 415.140870] __schedule_bug+0x9c/0xc0 [ 415.140875] __schedule+0xdf6/0x1300 [ 415.140877] ? rtlock_slowlock_locked+0x56c/0x1980 [ 415.140879] ? rcu_is_watching+0x12/0x60 [ 415.140883] schedule_rtlock+0x21/0x40 [ 415.140885] rtlock_slowlock_locked+0x502/0x1980 [ 415.140891] rt_spin_lock+0x89/0x1e0 [ 415.140893] hv_ringbuffer_write+0x87/0x2a0 [ 415.140899] vmbus_sendpacket_mpb_desc+0xb6/0xe0 [ 415.140900] ? rcu_is_watching+0x12/0x60 [ 415.140902] storvsc_queuecommand+0x669/0xbe0 [hv_storvsc] [ 415.140904] ? HARDIRQ_verbose+0x10/0x10 [ 415.140908] ? __rq_qos_issue+0x28/0x40 [ 415.140911] scsi_queue_rq+0x760/0xd80 [scsi_mod] [ 415.140926] __blk_mq_issue_directly+0x4a/0xc0 [ 415.140928] blk_mq_issue_direct+0x87/0x2b0 [ 415.140931] blk_mq_dispatch_queue_requests+0x120/0x440 [ 415.140933] blk_mq_flush_plug_list+0x7a/0x1a0 [ 415.140935] __blk_flush_plug+0xf4/0x150 [ 415.140940] __submit_bio+0x2b2/0x5c0 [ 415.140944] ? submit_bio_noacct_nocheck+0x272/0x360 [ 415.140946] submit_bio_noacct_nocheck+0x272/0x360 [ 415.140951] ext4_read_bh_lock+0x3e/0x60 [ext4] [ 415.140995] ext4_block_write_begin+0x396/0x650 [ext4] [ 415.141018] ? __pfx_ext4_da_get_block_prep+0x10/0x10 [ext4] [ 415.141038] ext4_da_write_begin+0x1c4/0x350 [ext4] [ 415.141060] generic_perform_write+0x14e/0x2c0 [ 415.141065] ext4_buffered_write_iter+0x6b/0x120 [ext4] [ 415.141083] vfs_write+0x2ca/0x570 [ 415.141087] ksys_write+0x76/0xf0 [ 415.141089] do_syscall_64+0x99/0x1490 [ 415.141093] ? rcu_is_watching+0x12/0x60 [ 415.141095] ? finish_task_switch.isra.0+0xdf/0x3d0 [ 415.141097] ? rcu_is_watching+0x12/0x60 [ 415.141098] ? lock_release+0x1f0/0x2a0 [ 415.141100] ? rcu_is_watching+0x12/0x60 [ 415.141101] ? finish_task_switch.isra.0+0xe4/0x3d0 [ 415.141103] ? rcu_is_watching+0x12/0x60 [ 415.141104] ? __schedule+0xb34/0x1300 [ 415.141106] ? hrtimer_try_to_cancel+0x1d/0x170 [ 415.141109] ? do_nanosleep+0x8b/0x160 [ 415.141111] ? hrtimer_nanosleep+0x89/0x100 [ 415.141114] ? __pfx_hrtimer_wakeup+0x10/0x10 [ 415.141116] ? xfd_validate_state+0x26/0x90 [ 415.141118] ? rcu_is_watching+0x12/0x60 [ 415.141120] ? do_syscall_64+0x1e0/0x1490 [ 415.141121] ? do_syscall_64+0x1e0/0x1490 [ 415.141123] ? rcu_is_watching+0x12/0x60 [ 415.141124] ? do_syscall_64+0x1e0/0x1490 [ 415.141125] ? do_syscall_64+0x1e0/0x1490 [ 415.141127] ? irqentry_exit+0x140/0x7e0 [ 415.141129] entry_SYSCALL_64_after_hwframe+0x76/0x7e get_cpu() disables preemption while the spinlock hv_ringbuffer_write is using is converted to an rt-mutex under PREEMPT_RT. The Linux kernel CVE team has assigned CVE-2026-43475 to this issue. Affected and fixed versions =========================== Fixed in 5.10.253 with commit cf00cb15f2515e38d3b7571bf6800b7c6ce70a84 Fixed in 5.15.203 with commit b82462af23e45e066dd56d2736ea70159a6ad647 Fixed in 6.1.167 with commit 91ab59f76d0866079420ebff1c7959fcd87a242e Fixed in 6.6.130 with commit e7919a293f9b6101e38bde0d8613daea6c9955df Fixed in 6.12.78 with commit f8db760f4f52a73a022a3d6c84c488ead952a9b5 Fixed in 6.18.19 with commit c2e73d8acd056347a70047e6be7cd98e0e811dfa Fixed in 6.19.9 with commit c7984d196476adcbd51c0ce386d7e90277198d57 Fixed in 7.0 with commit 57297736c08233987e5d29ce6584c6ca2a831b12 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-2026-43475 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: drivers/scsi/storvsc_drv.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/cf00cb15f2515e38d3b7571bf6800b7c6ce70a84 https://git.kernel.org/stable/c/b82462af23e45e066dd56d2736ea70159a6ad647 https://git.kernel.org/stable/c/91ab59f76d0866079420ebff1c7959fcd87a242e https://git.kernel.org/stable/c/e7919a293f9b6101e38bde0d8613daea6c9955df https://git.kernel.org/stable/c/f8db760f4f52a73a022a3d6c84c488ead952a9b5 https://git.kernel.org/stable/c/c2e73d8acd056347a70047e6be7cd98e0e811dfa https://git.kernel.org/stable/c/c7984d196476adcbd51c0ce386d7e90277198d57 https://git.kernel.org/stable/c/57297736c08233987e5d29ce6584c6ca2a831b12