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-libbpf-develUpgrade python3-perf6.12-debuginfoUpgrade kernel-libbpfUpgrade kernel-libbpf-staticUpgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel6.12-modules-extraUpgrade kernel-headersUpgrade kernel-tools-debuginfoUpgrade kernel-livepatch-6.12.29-33.102Upgrade perf6.12Upgrade kernel6.12-debuginfo-common-x86_64Upgrade python3-perf6.12Upgrade kernel6.12-debuginfoUpgrade kernel-tools-develUpgrade perf6.12-debuginfoUpgrade kernel-develUpgrade bpftoolUpgrade kernel-modules-extra-commonUpgrade kernel6.12Upgrade kernel-toolsUpgrade bpftool-debuginfoUpgrade kernel-libbpf-debuginfo | Aug 5, 2025 | May 9, 2025 |
| Debian | — | Upgrade linux | May 15, 2025 | May 9, 2025 |
| Redhat_linux | — | Upgrade kernel-rtNo solution existsUpgrade kernel | Jul 9, 2025 | May 9, 2025 |
| Suse | — | Upgrade kernel-kvmsmall-vdsoUpgrade kernel-docsUpgrade kernel-develUpgrade kernel-64kb-extraUpgrade kernel-source-vanillaUpgrade kernel-azureUpgrade kernel-defaultUpgrade kernel-kvmsmallUpgrade kernel-macrosUpgrade kernel-default-extraUpgrade kernel-64kb-develUpgrade kernel-kvmsmall-develUpgrade kernel-azure-develUpgrade kernel-sourceUpgrade kernel-azure-vdsoUpgrade kernel-obs-qaUpgrade kernel-default-vdsoUpgrade kernel-azure-extraUpgrade kernel-docs-htmlUpgrade kernel-default-livepatchUpgrade kernel-default-develUpgrade kernel-zfcpdumpUpgrade kernel-64kbUpgrade kernel-source-azureUpgrade kernel-devel-azureUpgrade kernel-syms | Dec 5, 2025 | Dec 5, 2025 |
| Ubuntu | — | Upgrade linux-image-6.14.0-1007-aws-64kUpgrade linux-image-oracle-64kUpgrade linux-image-6.14.0-1007-azureUpgrade linux-image-gcp-64kUpgrade linux-image-azureUpgrade linux-image-azure-fdeUpgrade linux-image-generic-64kUpgrade linux-image-6.14.0-1008-gcpUpgrade linux-image-6.14.0-1007-raspiUpgrade linux-image-6.14.0-1008-gcp-64kUpgrade linux-image-raspiUpgrade linux-image-awsUpgrade linux-image-6.14.0-1007-awsUpgrade linux-image-6.14.0-1004-realtimeUpgrade linux-image-6.14.0-1007-azure-fdeUpgrade linux-image-realtimeUpgrade linux-image-aws-64kUpgrade linux-image-6.14.0-1007-oracle-64kUpgrade linux-image-genericUpgrade linux-image-6.14.0-22-generic-64kUpgrade linux-image-gcpUpgrade linux-image-oracleUpgrade linux-image-6.14.0-1007-oracleUpgrade linux-image-6.14.0-22-generic | Jun 26, 2025 | May 9, 2025 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub