In the Linux kernel, the following vulnerability has been resolved:
timers/migration: Fix livelock in tmigr_handle_remote_up()
tmigr_handle_remote_cpu() skips timer_expire_remote() when cpu == smp_processor_id(), assuming the local softirq path already handled this CPU's timers.
This assumption is wrong because jiffies can advance after the handling of the CPU's global timers in run_timer_base(BASE_GLOBAL) and before tmigr_handle_remote() evaluates the expiry times.
As a consequence a timer which expires after the CPU local timer wheel advanced and becomes expired in the remote handling is ignored and the callback is never invoked and removed from the timer wheel.
What's worse is that fetch_next_timer_interrupt_remote() keeps reporting it as expired, and the event is re-queued with expires == now on each iteration. The goto-again loop spins indefinitely.
Fix this by calling timer_expire_remote() unconditionally. That's minimal overhead for the common case as __run_timer_base() returns immediately if there is nothing to expire in the local wheel.
[ tglx: Amend change log and add a comment ]
CVSS Details
- CVSS 3.1 Base Score: 7.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.18-debuginfo-common-aarch64Upgrade kernel-livepatch-6.12.94-123.174Upgrade kernel6.12-modules-extra-commonUpgrade kernel6.18-develUpgrade bpftool6.18-debuginfoUpgrade python3-perf6.18-debuginfoUpgrade bpftool6.12Upgrade kernel6.18-debuginfoUpgrade kernel6.12-modules-extraUpgrade kernel-livepatch-6.18.36-69.134Upgrade perf6.18-debuginfoUpgrade perf6.18Upgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel6.12-tools-debuginfoUpgrade python3-perf6.12-debuginfoUpgrade python3-perf6.18Upgrade perf6.12Upgrade kernel6.18-tools-develUpgrade kernel6.12-debuginfoUpgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel6.18-tools-debuginfoUpgrade bpftool6.12-debuginfoUpgrade kernel6.12-develUpgrade kernel6.18-modules-extra-commonUpgrade kernel6.18-toolsUpgrade kernel6.18-headersUpgrade kernel6.12Upgrade kernel6.18Upgrade kernel6.18-modules-extraUpgrade kernel6.12-tools-develUpgrade kernel6.12-toolsUpgrade microvm-kernel6.18Upgrade python3-perf6.12Upgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel6.12-headersUpgrade bpftool6.18Upgrade perf6.12-debuginfo | Jul 21, 2026 | Jun 25, 2026 |
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Ubuntu | — | Upgrade linux-image-gke-64kUpgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-gcpUpgrade linux-image-gke-hwe-26.04Upgrade linux-image-awsUpgrade linux-image-raspiUpgrade linux-image-raspi-realtimeUpgrade linux-image-nvidia-bos-64kUpgrade linux-image-7.0.0-1018-nvidiaUpgrade linux-image-gke-64k-7.0Upgrade linux-image-raspi-7.0Upgrade linux-image-7.0.0-1011-oracleUpgrade linux-image-7.0.0-1006-gke-64kUpgrade linux-image-7.0.0-1018-nvidia-64kUpgrade linux-image-oem-7.0Upgrade linux-image-oracleUpgrade linux-image-7.0.0-1014-azureUpgrade linux-image-realtimeUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-realtime-64k-7.0Upgrade linux-image-7.0.0-31-genericUpgrade linux-image-azure-7.0Upgrade linux-image-oem-26.04aUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-gcp-64k-7.0Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-azureUpgrade linux-image-realtime-hwe-26.04Upgrade linux-image-7.0.0-2018-nvidia-bosUpgrade linux-image-realtime-64kUpgrade linux-image-nvidia-64kUpgrade linux-image-7.0.0-1012-aws-64kUpgrade linux-image-7.0.0-1012-awsUpgrade linux-image-nvidia-bosUpgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-oracle-64kUpgrade linux-image-gcp-64kUpgrade linux-image-generic-7.0Upgrade linux-image-generic-hwe-26.04Upgrade linux-image-nvidia-64k-7.0Upgrade linux-image-generic-64kUpgrade linux-image-virtual-7.0Upgrade linux-image-7.0.0-1019-raspiUpgrade linux-image-oem-26.04bUpgrade linux-image-nvidia-7.0Upgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-gcp-7.0Upgrade linux-image-aws-64k-7.0Upgrade linux-image-7.0.0-1019-raspi-realtimeUpgrade linux-image-7.0.0-1011-oracle-64kUpgrade linux-image-genericUpgrade linux-image-7.0.0-2018-nvidia-bos-64kUpgrade linux-image-nvidia-bos-7.0Upgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-7.0.0-31-realtime-64kUpgrade linux-image-virtualUpgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-virtual-hwe-26.04Upgrade linux-image-7.0.0-1006-gkeUpgrade linux-image-gke-7.0Upgrade linux-image-gkeUpgrade linux-image-7.0.0-31-generic-64kUpgrade linux-image-7.0.0-1013-oemUpgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-nvidiaUpgrade linux-image-raspi-realtime-7.0Upgrade linux-image-ibmUpgrade linux-image-generic-64k-7.0Upgrade linux-image-aws-7.0Upgrade linux-image-aws-64kUpgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-realtime-7.0Upgrade linux-image-oracle-64k-7.0Upgrade linux-image-oem-26.04Upgrade linux-image-7.0.0-31-realtimeUpgrade linux-image-7.0.0-1013-ibmUpgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-oracle-7.0Upgrade linux-image-ibm-7.0Upgrade linux-image-azure-lts-26.04 | Sep 14, 2026 | Sep 7, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jul 13, 2026 | Jun 25, 2026 |
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