In the Linux kernel, the following vulnerability has been resolved:
usb: xhci: Fix isochronous Ring Underrun/Overrun event handling
The TRB pointer of these events points at enqueue at the time of error occurrence on xHCI 1.1+ HCs or it's NULL on older ones. By the time we are handling the event, a new TD may be queued at this ring position.
I can trigger this race by rising interrupt moderation to increase IRQ handling delay. Similar delay may occur naturally due to system load.
If this ever happens after a Missed Service Error, missed TDs will be skipped and the new TD processed as if it matched the event. It could be given back prematurely, risking data loss or buffer UAF by the xHC.
Don't complete TDs on xrun events and don't warn if queued TDs don't match the event's TRB pointer, which can be NULL or a link/no-op TRB. Don't warn if there are no queued TDs at all.
Now that it's safe, also handle xrun events if the skip flag is clear. This ensures completion of any TD stuck in 'error mid TD' state right before the xrun event, which could happen if a driver submits a finite number of URBs to a buggy HC and then an error occurs on the last TD.
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel-tools-develUpgrade perf6.12-debuginfoUpgrade kernel-develUpgrade kernel-libbpf-debuginfoUpgrade kernel6.12Upgrade bpftoolUpgrade kernel-toolsUpgrade kernel-modules-extra-commonUpgrade bpftool-debuginfoUpgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel-livepatch-6.12.29-33.102Upgrade python3-perf6.12-debuginfoUpgrade perf6.12Upgrade kernel6.12-modules-extraUpgrade kernel-libbpfUpgrade kernel-libbpf-develUpgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel-libbpf-staticUpgrade kernel-headersUpgrade python3-perf6.12Upgrade kernel-tools-debuginfoUpgrade kernel6.12-debuginfo | Aug 5, 2025 | May 9, 2025 |
| Debian | — | No solution existsUpgrade linux | May 15, 2025 | May 9, 2025 |
| Redhat_linux | — | Upgrade kernelNo solution existsUpgrade kernel-rt | Jul 9, 2025 | May 9, 2025 |
| Suse | — | Upgrade kernel-azure-vdsoUpgrade kernel-devel-azureUpgrade kernel-azure-develUpgrade kernel-sourceUpgrade kernel-zfcpdumpUpgrade kernel-default-develUpgrade kernel-kvmsmall-develUpgrade kernel-azure-extraUpgrade kernel-64kbUpgrade kernel-obs-qaUpgrade kernel-docs-htmlUpgrade kernel-default-extraUpgrade kernel-64kb-develUpgrade kernel-default-vdsoUpgrade kernel-source-azureUpgrade kernel-default-livepatchUpgrade kernel-kvmsmallUpgrade kernel-macrosUpgrade kernel-symsUpgrade kernel-develUpgrade kernel-kvmsmall-vdsoUpgrade kernel-defaultUpgrade kernel-64kb-extraUpgrade kernel-docsUpgrade kernel-azureUpgrade kernel-source-vanilla | Dec 5, 2025 | Dec 5, 2025 |
| Ubuntu | — | Upgrade linux-image-genericUpgrade linux-image-6.14.0-22-generic-64kUpgrade linux-image-6.14.0-1007-azure-fdeUpgrade linux-image-aws-64kUpgrade linux-image-realtimeUpgrade linux-image-6.14.0-1007-awsUpgrade linux-image-awsUpgrade linux-image-6.14.0-1004-realtimeUpgrade linux-image-6.14.0-1007-oracleUpgrade linux-image-oracleUpgrade linux-image-gcpUpgrade linux-image-6.14.0-22-genericUpgrade linux-image-6.14.0-1007-oracle-64kUpgrade linux-image-6.14.0-1007-raspiUpgrade linux-image-azure-fdeUpgrade linux-image-6.14.0-1008-gcpUpgrade linux-image-raspiUpgrade linux-image-azureUpgrade linux-image-6.14.0-1007-azureUpgrade linux-image-oracle-64kUpgrade linux-image-6.14.0-1007-aws-64kUpgrade linux-image-6.14.0-1008-gcp-64kUpgrade linux-image-generic-64kUpgrade linux-image-gcp-64k | Jun 26, 2025 | May 9, 2025 |
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