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In the Linux kernel, the following vulnerability has been resolved:
iov_iter: fix copy_page_from_iter_atomic() if KMAP_LOCAL_FORCE_MAP
generic/077 on x86_32 CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP=y with highmem, on huge=always tmpfs, issues a warning and then hangs (interruptibly):
WARNING: CPU: 5 PID: 3517 at mm/highmem.c:622 kunmap_local_indexed+0x62/0xc9 CPU: 5 UID: 0 PID: 3517 Comm: cp Not tainted 6.12.0-rc4 #2 ... copy_page_from_iter_atomic+0xa6/0x5ec generic_perform_write+0xf6/0x1b4 shmem_file_write_iter+0x54/0x67
Fix copy_page_from_iter_atomic() by limiting it in that case (include/linux/skbuff.h skb_frag_must_loop() does similar).
But going forward, perhaps CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP is too surprising, has outlived its usefulness, and should just be removed?
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 27, 2026 | Jul 27, 2026 |
| Ubuntu | — | Upgrade linux-image-lowlatencyUpgrade linux-image-oem-22.04bUpgrade linux-image-6.8.1-1020-realtimeUpgrade linux-image-oem-24.04aUpgrade linux-image-generic-64kUpgrade linux-image-6.8.0-1026-nvidia-lowlatencyUpgrade linux-image-oem-24.04bUpgrade linux-image-oracle-lts-24.04Upgrade linux-image-6.11.0-1009-azureUpgrade linux-image-6.11.0-1005-realtimeUpgrade linux-image-6.8.0-1028-gcpUpgrade linux-image-kvmUpgrade linux-image-generic-lpaeUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.11.0-1011-oracle-64kUpgrade linux-image-6.8.0-1028-raspiUpgrade linux-image-oem-22.04cUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-ibm-classicUpgrade linux-image-nvidia-64kUpgrade linux-image-6.11.0-1015-oemUpgrade linux-image-oem-22.04aUpgrade linux-image-6.8.0-58-lowlatency-64kUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-raspi-realtimeUpgrade linux-image-oracle-64kUpgrade linux-image-oem-22.04Upgrade linux-image-azure-fdeUpgrade linux-image-6.11.0-1011-oracleUpgrade linux-image-6.11.0-1010-lowlatencyUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-azureUpgrade linux-image-6.8.0-58-genericUpgrade linux-image-ibmUpgrade linux-image-6.8.0-1014-azure-nvidiaUpgrade linux-image-nvidiaUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-gkeop-6.8Upgrade linux-image-azure-lts-24.04Upgrade linux-image-6.8.0-1026-oemUpgrade linux-image-gcpUpgrade linux-image-azure-nvidiaUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-6.8.0-1024-oracle-64kUpgrade linux-image-6.8.0-58-generic-64kUpgrade linux-image-6.8.0-58-lowlatencyUpgrade linux-image-6.11.0-1009-azure-fdeUpgrade linux-image-raspiUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-realtimeUpgrade linux-image-6.8.0-1024-oracleUpgrade linux-image-6.8.0-1024-ibmUpgrade linux-image-gcp-64kUpgrade linux-image-6.8.0-1027-azure-fdeUpgrade linux-image-6.8.0-1028-gcp-64kUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-awsUpgrade linux-image-6.8.0-2023-raspi-realtimeUpgrade linux-image-6.11.0-18-genericUpgrade linux-image-6.11.0-1009-awsUpgrade linux-image-6.11.0-1008-raspiUpgrade linux-image-6.8.0-1026-nvidiaUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-6.8.0-1026-nvidia-lowlatency-64kUpgrade linux-image-nvidia-6.8Upgrade linux-image-6.11.0-1009-gcpUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-oracleUpgrade linux-image-oem-22.04dUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-aws-lts-24.04Upgrade linux-image-virtualUpgrade linux-image-6.8.0-1027-awsUpgrade linux-image-gkeopUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-gkeUpgrade linux-image-6.8.0-1010-gkeopUpgrade linux-image-6.11.0-1010-lowlatency-64kUpgrade linux-image-oem-24.04Upgrade linux-image-6.8.0-1026-nvidia-64kUpgrade linux-image-6.11.0-18-generic-64kUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-6.8.0-1027-azureUpgrade linux-image-genericUpgrade linux-image-6.8.0-1023-gke | Feb 20, 2025 | Nov 9, 2024 |
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