# CVE-2026-43475: scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT

Status: published. Published: 2026-05-08. Updated: 2026-11-06.

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] [<ffffffffc0656171>] 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]  <TASK>
[  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+0x140/0
---truncated---

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ d86adf482b843b3a58a9ec3b7c1ccdbf7c705db1; < cf00cb15f2515e38d3b7571bf6800b7c6ce70a84 (affected, git); ≥ d86adf482b843b3a58a9ec3b7c1ccdbf7c705db1; < b82462af23e45e066dd56d2736ea70159a6ad647 (affected, git); ≥ d86adf482b843b3a58a9ec3b7c1ccdbf7c705db1; < 91ab59f76d0866079420ebff1c7959fcd87a242e (affected, git); ≥ d86adf482b843b3a58a9ec3b7c1ccdbf7c705db1; < e7919a293f9b6101e38bde0d8613daea6c9955df (affected, git); ≥ d86adf482b843b3a58a9ec3b7c1ccdbf7c705db1; < f8db760f4f52a73a022a3d6c84c488ead952a9b5 (affected, git); ≥ d86adf482b843b3a58a9ec3b7c1ccdbf7c705db1; < c2e73d8acd056347a70047e6be7cd98e0e811dfa (affected, git); ≥ d86adf482b843b3a58a9ec3b7c1ccdbf7c705db1; < c7984d196476adcbd51c0ce386d7e90277198d57 (affected, git); ≥ d86adf482b843b3a58a9ec3b7c1ccdbf7c705db1; < 57297736c08233987e5d29ce6584c6ca2a831b12 (affected, git). Source: CNA: Linux
- Linux / Linux: 4.11 (affected); ≥ 0; < 4.11 (unaffected, semver); ≥ 5.10.253; ≤ 5.10.* (unaffected, semver); ≥ 5.15.203; ≤ 5.15.* (unaffected, semver); ≥ 6.1.167; ≤ 6.1.* (unaffected, semver); ≥ 6.6.130; ≤ 6.6.* (unaffected, semver); ≥ 6.12.78; ≤ 6.12.* (unaffected, semver); ≥ 6.18.19; ≤ 6.18.* (unaffected, semver); ≥ 6.19.9; ≤ 6.19.* (unaffected, semver); ≥ 7.0; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.11% as of 2026-11-06; percentile 1.51%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/cf00cb15f2515e38d3b7571bf6800b7c6ce70a84 (CNA: Linux)

- https://git.kernel.org/stable/c/b82462af23e45e066dd56d2736ea70159a6ad647 (CNA: Linux)

- https://git.kernel.org/stable/c/91ab59f76d0866079420ebff1c7959fcd87a242e (CNA: Linux)

- https://git.kernel.org/stable/c/e7919a293f9b6101e38bde0d8613daea6c9955df (CNA: Linux)

- https://git.kernel.org/stable/c/f8db760f4f52a73a022a3d6c84c488ead952a9b5 (CNA: Linux)

- https://git.kernel.org/stable/c/c2e73d8acd056347a70047e6be7cd98e0e811dfa (CNA: Linux)

- https://git.kernel.org/stable/c/c7984d196476adcbd51c0ce386d7e90277198d57 (CNA: Linux)

- https://git.kernel.org/stable/c/57297736c08233987e5d29ce6584c6ca2a831b12 (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-43475; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-43475; retrieved 2026-11-06; source updated Not reported

Revision: 7465b69c257b58476232b177e34d5185a378dd64272592ec8d3018c93e18eb39

Canonical: https://y2.dev/cve/CVE-2026-43475

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