In the Linux kernel, the following vulnerability has been resolved:
mm: vmalloc: ensure vmap_block is initialised before adding to queue
Commit 8c61291fd850 ("mm: fix incorrect vbq reference in purge_fragmented_block") extended the 'vmap_block' structure to contain a 'cpu' field which is set at allocation time to the id of the initialising CPU.
When a new 'vmap_block' is being instantiated by new_vmap_block(), the partially initialised structure is added to the local 'vmap_block_queue' xarray before the 'cpu' field has been initialised. If another CPU is concurrently walking the xarray (e.g. via vm_unmap_aliases()), then it may perform an out-of-bounds access to the remote queue thanks to an uninitialised index.
This has been observed as UBSAN errors in Android:
| Internal error: UBSAN: array index out of bounds: 00000000f2005512 [#1] PREEMPT SMP | | Call trace: | purge_fragmented_block+0x204/0x21c | _vm_unmap_aliases+0x170/0x378 | vm_unmap_aliases+0x1c/0x28 | change_memory_common+0x1dc/0x26c | set_memory_ro+0x18/0x24 | module_enable_ro+0x98/0x238 | do_init_module+0x1b0/0x310
Move the initialisation of 'vb->cpu' in new_vmap_block() ahead of the addition to the xarray.
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 exists | Jul 9, 2025 | Sep 27, 2024 |
| Ubuntu | — | Upgrade linux-image-ibmUpgrade linux-image-generic-64kUpgrade linux-image-6.8.0-1017-ibmUpgrade linux-image-6.8.0-1017-oracle-64kUpgrade linux-image-oem-22.04aUpgrade linux-image-6.8.0-50-lowlatency-64kUpgrade linux-image-nvidiaUpgrade linux-image-ibm-classicUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-kvmUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-awsUpgrade linux-image-gcpUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-azureUpgrade linux-image-6.8.0-50-lowlatencyUpgrade linux-image-oem-22.04bUpgrade linux-image-6.8.0-1016-raspiUpgrade linux-image-azure-fdeUpgrade linux-image-6.8.0-1020-awsUpgrade linux-image-generic-lpaeUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-oracle-64kUpgrade linux-image-6.8.0-1019-nvidia-64kUpgrade linux-image-6.8.0-1020-azure-fdeUpgrade linux-image-nvidia-64kUpgrade linux-image-oem-22.04cUpgrade linux-image-oem-24.04aUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-lowlatency-hwe-24.04Upgrade linux-image-6.8.0-1019-nvidiaUpgrade linux-image-lowlatencyUpgrade linux-image-lowlatency-64k-hwe-24.04Upgrade linux-image-raspiUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-6.8.0-1017-oracleUpgrade linux-image-oracleUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-6.8.0-1015-gkeUpgrade linux-image-6.8.0-1019-nvidia-lowlatencyUpgrade linux-image-6.8.0-50-genericUpgrade linux-image-virtualUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-6.8.0-1019-gcpUpgrade linux-image-oem-22.04dUpgrade linux-image-oem-24.04Upgrade linux-image-nvidia-64k-6.8Upgrade linux-image-gkeUpgrade linux-image-oem-22.04Upgrade linux-image-lowlatency-64kUpgrade linux-image-6.8.0-1019-nvidia-lowlatency-64kUpgrade linux-image-genericUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-nvidia-6.8Upgrade linux-image-6.8.0-50-generic-64kUpgrade linux-image-6.8.0-1020-azureUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-6.8.0-1018-oem | Dec 13, 2024 | Sep 27, 2024 |
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