In the Linux kernel, the following vulnerability has been resolved:
ublk: fix handling recovery & reissue in ublk_abort_queue()
Commit 8284066946e6 ("ublk: grab request reference when the request is handled by userspace") doesn't grab request reference in case of recovery reissue. Then the request can be requeued & re-dispatch & failed when canceling uring command.
If it is one zc request, the request can be freed before io_uring returns the zc buffer back, then cause kernel panic:
[ 126.773061] BUG: kernel NULL pointer dereference, address: 00000000000000c8 [ 126.773657] #PF: supervisor read access in kernel mode [ 126.774052] #PF: error_code(0x0000) - not-present page [ 126.774455] PGD 0 P4D 0 [ 126.774698] Oops: Oops: 0000 [#1] SMP NOPTI [ 126.775034] CPU: 13 UID: 0 PID: 1612 Comm: kworker/u64:55 Not tainted 6.14.0_blk+ #182 PREEMPT(full) [ 126.775676] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-1.fc39 04/01/2014 [ 126.776275] Workqueue: iou_exit io_ring_exit_work [ 126.776651] RIP: 0010:ublk_io_release+0x14/0x130 [ublk_drv]
Fixes it by always grabbing request reference for aborting the request.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Suse | — | Upgrade kernel-source-vanillaUpgrade kernel-defaultUpgrade kernel-default-livepatchUpgrade kernel-docs-htmlUpgrade kernel-64kb-extraUpgrade kernel-azure-develUpgrade kernel-kvmsmall-vdsoUpgrade kernel-azureUpgrade kernel-azure-vdsoUpgrade kernel-kvmsmallUpgrade kernel-macrosUpgrade kernel-obs-qaUpgrade kernel-default-extraUpgrade kernel-64kb-develUpgrade kernel-default-develUpgrade kernel-azure-extraUpgrade kernel-source-azureUpgrade kernel-default-vdsoUpgrade kernel-devel-azureUpgrade kernel-sourceUpgrade kernel-develUpgrade kernel-zfcpdumpUpgrade kernel-symsUpgrade kernel-docsUpgrade kernel-64kbUpgrade kernel-kvmsmall-devel | Dec 5, 2025 | Dec 5, 2025 |
| Ubuntu | — | Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-6.14.0-22-generic-64kUpgrade linux-image-raspiUpgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-oem-22.04dUpgrade linux-image-aws-6.8Upgrade linux-image-azure-fdeUpgrade linux-image-gcp-fipsUpgrade linux-image-awsUpgrade linux-image-gcp-6.8Upgrade linux-image-realtime-6.8.1Upgrade linux-image-6.8.0-100-genericUpgrade linux-image-6.14.0-1008-gcpUpgrade linux-image-6.14.0-1007-aws-64kUpgrade linux-image-6.14.0-1007-raspiUpgrade linux-image-gcp-64kUpgrade linux-image-6.8.0-1047-gcp-64kUpgrade linux-image-lowlatency-6.8Upgrade linux-image-6.8.0-100-lowlatencyUpgrade linux-image-oracleUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-fipsUpgrade linux-image-6.8.0-1047-gcpUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-generic-lpaeUpgrade linux-image-6.14.0-22-genericUpgrade linux-image-6.8.0-100-generic-64kUpgrade linux-image-lowlatency-64kUpgrade linux-image-aws-fipsUpgrade linux-image-6.8.0-1044-ibmUpgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-6.8.1-1041-realtimeUpgrade linux-image-6.8.0-1023-xilinxUpgrade linux-image-generic-64k-6.8Upgrade linux-image-6.8.0-1046-azureUpgrade linux-image-oem-22.04Upgrade linux-image-6.14.0-1008-gcp-64kUpgrade linux-image-raspi-6.8Upgrade linux-image-6.8.0-1046-awsUpgrade linux-image-xilinx-6.8Upgrade linux-image-oracle-64k-6.8Upgrade linux-image-azure-fipsUpgrade linux-image-azureUpgrade linux-image-6.8.0-1043-gke-64kUpgrade linux-image-6.8.0-1046-aws-64kUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-1046-nvidia-lowlatencyUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-kvmUpgrade linux-image-6.8.0-2037-raspi-realtimeUpgrade linux-image-gkeUpgrade linux-image-ibm-classicUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-gkeopUpgrade linux-image-6.14.0-1007-azureUpgrade linux-image-xilinxUpgrade linux-image-realtime-hwe-22.04Upgrade linux-image-raspi-realtimeUpgrade linux-image-generic-64kUpgrade linux-image-6.8.0-1046-nvidia-64kUpgrade linux-image-6.14.0-1007-azure-fdeUpgrade linux-image-gkeop-6.8Upgrade linux-image-6.14.0-1007-oracleUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-gcp-fips-6.8Upgrade linux-image-oracle-6.8Upgrade linux-image-aws-lts-24.04Upgrade linux-image-6.8.0-1046-nvidia-lowlatency-64kUpgrade linux-image-azure-lts-24.04Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-nvidiaUpgrade linux-image-intel-iotgUpgrade linux-image-6.8.0-100-fipsUpgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-gcpUpgrade linux-image-genericUpgrade linux-image-fips-6.8Upgrade linux-image-6.8.0-1046-azure-fipsUpgrade linux-image-aws-fips-6.8Upgrade linux-image-azure-6.8Upgrade linux-image-6.8.0-1043-gkeUpgrade linux-image-oem-22.04bUpgrade linux-image-virtualUpgrade linux-image-realtimeUpgrade linux-image-nvidia-64kUpgrade linux-image-6.8.0-1047-gcp-fipsUpgrade linux-image-aws-64kUpgrade linux-image-raspi-realtime-6.8Upgrade linux-image-6.8.0-1051-azureUpgrade linux-image-6.8.0-1046-aws-fipsUpgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-6.8.0-100-lowlatency-64kUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-ibmUpgrade linux-image-azure-fips-6.8Upgrade linux-image-6.8.0-1047-raspiUpgrade linux-image-6.8.0-1030-gkeopUpgrade linux-image-6.8.0-1046-nvidiaUpgrade linux-image-oem-22.04cUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-gke-6.8Upgrade linux-image-gcp-lts-24.04Upgrade linux-image-generic-6.8Upgrade linux-image-gke-64k-6.8Upgrade linux-image-oracle-64kUpgrade linux-image-oem-22.04aUpgrade linux-image-6.14.0-1004-realtimeUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-aws-64k-6.8Upgrade linux-image-intel-iot-realtimeUpgrade linux-image-ibm-6.8Upgrade linux-image-6.8.0-1043-oracle | Jun 26, 2025 | May 1, 2025 |
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