In the Linux kernel, the following vulnerability has been resolved:
mm/swap: add cond_resched() in swap_reclaim_full_clusters to prevent softlockup
We hit a real softlockup in an internal stress test environment. The workload was LTP memory/swap stress on a large arm64 machine, with 320 CPUs, about 1TB memory and an 8.6GB swap device. The system was under heavy load and the swap device had a large number of full clusters. The softlockup was triggered during a stress test after about 3 days.
So, add periodic cond_resched() calls during large full_clusters reclaim operations to prevent softlockup issues.
Detailed call trace as follow:
PID: 3817773 TASK: ffff0883bb28b780 CPU: 48 COMMAND: "kworker/48:7" #0 [ffff800080183d10] __crash_kexec at ffffa4c1361e5de4 #1 [ffff800080183d90] panic at ffffa4c1360d5e9c #2 [ffff800080183e20] watchdog_timer_fn at ffffa4c136231fa8 ... #16 [ffff8000c4ad3cb0] swap_cache_del_folio at ffffa4c1363e1614 #17 [ffff8000c4ad3ce0] __try_to_reclaim_swap at ffffa4c1363e4bfc #18 [ffff8000c4ad3d40] swap_reclaim_full_clusters at ffffa4c1363e5474 #19 [ffff8000c4ad3da0] swap_reclaim_work at ffffa4c1363e550c #20 [ffff8000c4ad3dc0] process_one_work at ffffa4c136102edc #21 [ffff8000c4ad3e10] worker_thread at ffffa4c136103398 #22 [ffff8000c4ad3e70] kthread at ffffa4c13610d95c
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 kernel6.18-modules-extraUpgrade kernel6.18-develUpgrade kernel6.18-tools-develUpgrade python3-perf6.18Upgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel6.18-modules-extra-commonUpgrade perf6.12Upgrade perf6.18Upgrade kernel6.18-tools-debuginfoUpgrade kernel6.12-headersUpgrade python3-perf6.12-debuginfoUpgrade kernel6.12-tools-debuginfoUpgrade kernel-livepatch-6.12.100-125.179Upgrade bpftool6.18Upgrade kernel6.12-debuginfoUpgrade kernel6.12-develUpgrade microvm-kernel6.18Upgrade kernel6.18Upgrade kernel6.12-toolsUpgrade kernel6.18-toolsUpgrade bpftool6.12Upgrade kernel-livepatch-6.18.39-79.141Upgrade kernel6.12Upgrade kernel6.18-debuginfoUpgrade kernel6.12-tools-develUpgrade kernel6.12-modules-extra-commonUpgrade bpftool6.18-debuginfoUpgrade kernel6.12-modules-extraUpgrade kernel6.12-debuginfo-common-aarch64Upgrade bpftool6.12-debuginfoUpgrade python3-perf6.18-debuginfoUpgrade perf6.18-debuginfoUpgrade python3-perf6.12Upgrade kernel6.18-debuginfo-common-aarch64Upgrade perf6.12-debuginfoUpgrade kernel6.18-headersUpgrade kernel6.12-debuginfo-common-x86_64 | Aug 18, 2026 | Jul 25, 2026 |
| Debian | — | Upgrade linux-6.12Upgrade linux | Jul 28, 2026 | Jul 28, 2026 |
| Redhat_linux | — | No solution exists | Jul 31, 2026 | Jul 25, 2026 |
| Ubuntu | — | Upgrade linux-image-oem-26.04bUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-gkeUpgrade linux-image-raspi-7.0Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-realtimeUpgrade linux-image-realtime-64kUpgrade linux-image-awsUpgrade linux-image-7.0.0-1013-ibmUpgrade linux-image-7.0.0-1006-gkeUpgrade linux-image-7.0.0-31-realtime-64kUpgrade linux-image-aws-7.0Upgrade linux-image-realtime-7.0Upgrade linux-image-7.0.0-31-realtimeUpgrade linux-image-aws-64k-7.0Upgrade linux-image-virtual-7.0Upgrade linux-image-realtime-64k-7.0Upgrade linux-image-raspi-realtime-7.0Upgrade linux-image-gke-hwe-26.04Upgrade linux-image-7.0.0-1019-raspiUpgrade linux-image-virtualUpgrade linux-image-gcp-7.0Upgrade linux-image-7.0.0-1012-aws-64kUpgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-nvidia-7.0Upgrade linux-image-gke-64k-7.0Upgrade linux-image-7.0.0-1013-oemUpgrade linux-image-oem-26.04aUpgrade linux-image-realtime-hwe-26.04Upgrade linux-image-nvidiaUpgrade linux-image-virtual-hwe-26.04Upgrade linux-image-gcp-64kUpgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-7.0.0-2018-nvidia-bos-64kUpgrade linux-image-oem-7.0Upgrade linux-image-generic-hwe-26.04Upgrade linux-image-nvidia-64k-7.0Upgrade linux-image-7.0.0-31-genericUpgrade linux-image-nvidia-bos-64kUpgrade linux-image-nvidia-64kUpgrade linux-image-ibm-7.0Upgrade linux-image-genericUpgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-7.0.0-31-generic-64kUpgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-gcp-64k-7.0Upgrade linux-image-7.0.0-1019-raspi-realtimeUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-gcpUpgrade linux-image-aws-64kUpgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-gke-7.0Upgrade linux-image-nvidia-bosUpgrade linux-image-ibmUpgrade linux-image-7.0.0-1006-gke-64kUpgrade linux-image-generic-64kUpgrade linux-image-oem-26.04Upgrade linux-image-7.0.0-1012-awsUpgrade linux-image-nvidia-bos-7.0Upgrade linux-image-7.0.0-2018-nvidia-bosUpgrade linux-image-7.0.0-1018-nvidia-64kUpgrade linux-image-generic-7.0Upgrade linux-image-generic-64k-7.0Upgrade linux-image-raspi-realtimeUpgrade linux-image-raspiUpgrade linux-image-gke-64kUpgrade linux-image-7.0.0-1018-nvidia | Sep 14, 2026 | Sep 7, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jul 31, 2026 | Jul 25, 2026 |
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