In the Linux kernel, the following vulnerability has been resolved:
iommufd: Protect against overflow of ALIGN() during iova allocation
Userspace can supply an iova and uptr such that the target iova alignment becomes really big and ALIGN() overflows which corrupts the selected area range during allocation. CONFIG_IOMMUFD_TEST can detect this:
WARNING: CPU: 1 PID: 5092 at drivers/iommu/iommufd/io_pagetable.c:268 iopt_alloc_area_pages drivers/iommu/iommufd/io_pagetable.c:268 [inline] WARNING: CPU: 1 PID: 5092 at drivers/iommu/iommufd/io_pagetable.c:268 iopt_map_pages+0xf95/0x1050 drivers/iommu/iommufd/io_pagetable.c:352 Modules linked in: CPU: 1 PID: 5092 Comm: syz-executor294 Not tainted 6.10.0-rc5-syzkaller-00294-g3ffea9a7a6f7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:iopt_alloc_area_pages drivers/iommu/iommufd/io_pagetable.c:268 [inline] RIP: 0010:iopt_map_pages+0xf95/0x1050 drivers/iommu/iommufd/io_pagetable.c:352 Code: fc e9 a4 f3 ff ff e8 1a 8b 4c fc 41 be e4 ff ff ff e9 8a f3 ff ff e8 0a 8b 4c fc 90 0f 0b 90 e9 37 f5 ff ff e8 fc 8a 4c fc 90 <0f> 0b 90 e9 68 f3 ff ff 48 c7 c1 ec 82 ad 8f 80 e1 07 80 c1 03 38 RSP: 0018:ffffc90003ebf9e0 EFLAGS: 00010293 RAX: ffffffff85499fa4 RBX: 00000000ffffffef RCX: ffff888079b49e00 RDX: 0000000000000000 RSI: 00000000ffffffef RDI: 0000000000000000 RBP: ffffc90003ebfc50 R08: ffffffff85499b30 R09: ffffffff85499942 R10: 0000000000000002 R11: ffff888079b49e00 R12: ffff8880228e0010 R13: 0000000000000000 R14: 1ffff920007d7f68 R15: ffffc90003ebfd00 FS: 000055557d760380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000005fdeb8 CR3: 000000007404a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> iommufd_ioas_copy+0x610/0x7b0 drivers/iommu/iommufd/ioas.c:274 iommufd_fops_ioctl+0x4d9/0x5a0 drivers/iommu/iommufd/main.c:421 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f
Cap the automatic alignment to the huge page size, which is probably a better idea overall. Huge automatic alignments can fragment and chew up the available IOVA space without any reason.
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 |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 27, 2026 | Jul 27, 2026 |
| Redhat_linux | — | No solution existsUpgrade kernel-rtUpgrade kernel | May 15, 2025 | Oct 21, 2024 |
| Ubuntu | — | Upgrade linux-image-realtimeUpgrade linux-image-virtualUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-oem-24.04aUpgrade linux-image-6.11.0-1005-realtimeUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-oracle-64kUpgrade linux-image-nvidiaUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-6.11.0-1010-lowlatency-64kUpgrade linux-image-6.8.0-1020-oracleUpgrade linux-image-6.8.0-54-genericUpgrade linux-image-nvidia-64kUpgrade linux-image-6.8.0-54-generic-64kUpgrade linux-image-6.11.0-1015-oemUpgrade linux-image-6.8.0-1025-azure-fdeUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-oem-22.04bUpgrade linux-image-6.8.0-54-lowlatency-64kUpgrade linux-image-6.8.0-57-generic-64kUpgrade linux-image-generic-64kUpgrade linux-image-6.8.0-57-genericUpgrade linux-image-6.11.0-1009-gcpUpgrade linux-image-6.8.0-1024-oemUpgrade linux-image-ibm-classicUpgrade linux-image-kvmUpgrade linux-image-6.8.0-1006-gkeopUpgrade linux-image-6.11.0-1010-lowlatencyUpgrade linux-image-6.8.0-1019-gkeUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-gkeop-6.8Upgrade linux-image-6.8.0-1024-gcpUpgrade linux-image-oem-24.04Upgrade linux-image-6.11.0-1011-oracle-64kUpgrade linux-image-6.11.0-18-generic-64kUpgrade linux-image-6.8.0-1019-raspiUpgrade linux-image-6.11.0-1011-oracleUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-oem-22.04cUpgrade linux-image-gcpUpgrade linux-image-ibmUpgrade linux-image-oem-22.04aUpgrade linux-image-6.11.0-1009-azure-fdeUpgrade linux-image-aws-lts-24.04Upgrade linux-image-gkeUpgrade linux-image-gkeopUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-azure-lts-24.04Upgrade linux-image-6.8.0-1024-gcp-64kUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-6.11.0-18-genericUpgrade linux-image-genericUpgrade linux-image-6.8.0-1025-azureUpgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-6.11.0-1008-raspiUpgrade linux-image-6.8.0-1022-nvidiaUpgrade linux-image-oem-22.04Upgrade linux-image-oracle-lts-24.04Upgrade linux-image-oem-22.04dUpgrade linux-image-6.11.0-1009-azureUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-gcp-64kUpgrade linux-image-oracleUpgrade linux-image-awsUpgrade linux-image-6.8.0-1022-nvidia-lowlatencyUpgrade linux-image-6.8.0-1020-oracle-64kUpgrade linux-image-raspiUpgrade linux-image-nvidia-6.8Upgrade linux-image-6.8.0-1022-ibmUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-azureUpgrade linux-image-6.8.0-1023-awsUpgrade linux-image-6.8.0-54-lowlatencyUpgrade linux-image-lowlatency-64kUpgrade linux-image-azure-fdeUpgrade linux-image-generic-lpaeUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-lowlatencyUpgrade linux-image-6.11.0-1009-awsUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-6.8.0-1022-nvidia-64kUpgrade linux-image-6.8.0-1022-nvidia-lowlatency-64kUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-oem-24.04b | Feb 20, 2025 | Oct 21, 2024 |
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