In the Linux kernel, the following vulnerability has been resolved:
block: skip sync_blockdev() on surprise removal in bdev_mark_dead()
bdev_mark_dead()'s @surprise == true means the device is already gone. The filesystem callback fs_bdev_mark_dead() honours this and skips sync_filesystem(), but the bare block device path (no ->mark_dead op) lost its !surprise guard when the holder ->mark_dead callback was wired up (see Fixes), and now calls sync_blockdev() unconditionally, which can hang forever waiting on writeback that can no longer complete.
syzkaller hit this via nvme_reset_work()'s "I/O queues lost" path: nvme_mark_namespaces_dead() -> blk_mark_disk_dead() -> bdev_mark_dead(bdev, true) -> sync_blockdev() blocks in folio_wait_writeback(), wedging the reset worker and every task waiting on it.
Skip the sync on surprise removal, matching fs_bdev_mark_dead(); invalidate_bdev() still runs. Orderly removal (surprise == false) is unchanged.
Found by FuzzNvme(Syzkaller with FEMU fuzzing framework).
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.12-toolsUpgrade python3-perf6.12-debuginfoUpgrade kernel6.12Upgrade bpftool6.12Upgrade perf6.12-debuginfoUpgrade kernel-livepatch-6.18.39-79.141Upgrade kernel6.18-headersUpgrade bpftool6.12-debuginfoUpgrade kernel6.18-debuginfoUpgrade bpftool6.18-debuginfoUpgrade kernel6.12-modules-extra-commonUpgrade kernel6.12-tools-develUpgrade kernel6.12-modules-extraUpgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel6.18-debuginfo-common-aarch64Upgrade perf6.18-debuginfoUpgrade kernel6.18-modules-extraUpgrade python3-perf6.18-debuginfoUpgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel6.18-toolsUpgrade kernel6.18Upgrade bpftool6.18Upgrade kernel6.18-develUpgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel6.12-debuginfoUpgrade kernel-livepatch-6.12.100-125.179Upgrade python3-perf6.18Upgrade kernel6.18-tools-develUpgrade perf6.12Upgrade kernel6.12-headersUpgrade kernel6.12-develUpgrade perf6.18Upgrade python3-perf6.12Upgrade kernel6.12-tools-debuginfoUpgrade kernel6.18-tools-debuginfoUpgrade kernel6.18-modules-extra-commonUpgrade microvm-kernel6.18 | Aug 18, 2026 | Jul 25, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.12 | Jul 28, 2026 | Jul 28, 2026 |
| Redhat_linux | — | No solution exists | Aug 10, 2026 | Jul 25, 2026 |
| Ubuntu | — | Upgrade linux-image-aws-64k-7.0Upgrade linux-image-oem-7.0Upgrade linux-image-7.0.0-1018-nvidia-64kUpgrade linux-image-ibm-7.0Upgrade linux-image-gcp-64k-7.0Upgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-oem-26.04Upgrade linux-image-azureUpgrade linux-image-generic-64kUpgrade linux-image-raspi-realtime-7.0Upgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-gcp-64kUpgrade linux-image-genericUpgrade linux-image-oracle-7.0Upgrade linux-image-nvidia-7.0Upgrade linux-image-7.0.0-1018-nvidiaUpgrade linux-image-7.0.0-1012-awsUpgrade linux-image-nvidia-64k-7.0Upgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-virtual-hwe-26.04Upgrade linux-image-7.0.0-2018-nvidia-bos-64kUpgrade linux-image-ibmUpgrade linux-image-raspiUpgrade linux-image-realtime-7.0Upgrade linux-image-aws-7.0Upgrade linux-image-nvidiaUpgrade linux-image-gke-64k-7.0Upgrade linux-image-gke-64kUpgrade linux-image-7.0.0-31-realtimeUpgrade linux-image-nvidia-bos-64kUpgrade linux-image-7.0.0-2018-nvidia-bosUpgrade linux-image-7.0.0-31-realtime-64kUpgrade linux-image-gke-7.0Upgrade linux-image-oem-26.04aUpgrade linux-image-7.0.0-1012-aws-64kUpgrade linux-image-nvidia-bosUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-generic-7.0Upgrade linux-image-7.0.0-1006-gkeUpgrade linux-image-virtual-7.0Upgrade linux-image-7.0.0-1006-gke-64kUpgrade linux-image-oracle-64k-7.0Upgrade linux-image-realtime-hwe-26.04Upgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-gcp-7.0Upgrade linux-image-aws-64kUpgrade linux-image-7.0.0-1019-raspi-realtimeUpgrade linux-image-7.0.0-1011-oracle-64kUpgrade linux-image-oracleUpgrade linux-image-oracle-64kUpgrade linux-image-realtime-64kUpgrade linux-image-gcpUpgrade linux-image-awsUpgrade linux-image-7.0.0-31-generic-64kUpgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-raspi-realtimeUpgrade linux-image-gkeUpgrade linux-image-generic-64k-7.0Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-generic-hwe-26.04Upgrade linux-image-7.0.0-1011-oracleUpgrade linux-image-nvidia-64kUpgrade linux-image-realtime-64k-7.0Upgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-7.0.0-1014-azureUpgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-7.0.0-1013-oemUpgrade linux-image-virtualUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-oem-26.04bUpgrade linux-image-gke-hwe-26.04Upgrade linux-image-7.0.0-1019-raspiUpgrade linux-image-7.0.0-1013-ibmUpgrade linux-image-azure-lts-26.04Upgrade linux-image-7.0.0-31-genericUpgrade linux-image-realtimeUpgrade linux-image-raspi-7.0Upgrade linux-image-nvidia-bos-7.0Upgrade linux-image-azure-7.0 | Sep 14, 2026 | Sep 7, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 3, 2026 | Jul 25, 2026 |
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