CVE-2024-46847 (GCVE-0-2024-46847)
Vulnerability from cvelistv5
Published
2024-09-27 12:39
Modified
2026-05-23 15:53
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 88e0ad40d08a73a74c597e69f4cd2d1fba3838b5
Version: 8c61291fd8500e3b35c7ec0c781b273d8cc96cde
Version: 8c61291fd8500e3b35c7ec0c781b273d8cc96cde
Version: 9983b81579be3403f5cc44b11f66c6c8bea6547f
Version: 6.6.37   ≤
Version: 6.9.8   ≤
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: vmalloc: ensure vmap_block is initialised before adding to queue\n\nCommit 8c61291fd850 (\"mm: fix incorrect vbq reference in\npurge_fragmented_block\") extended the \u0027vmap_block\u0027 structure to contain a\n\u0027cpu\u0027 field which is set at allocation time to the id of the initialising\nCPU.\n\nWhen a new \u0027vmap_block\u0027 is being instantiated by new_vmap_block(), the\npartially initialised structure is added to the local \u0027vmap_block_queue\u0027\nxarray before the \u0027cpu\u0027 field has been initialised.  If another CPU is\nconcurrently walking the xarray (e.g.  via vm_unmap_aliases()), then it\nmay perform an out-of-bounds access to the remote queue thanks to an\nuninitialised index.\n\nThis has been observed as UBSAN errors in Android:\n\n | Internal error: UBSAN: array index out of bounds: 00000000f2005512 [#1] PREEMPT SMP\n |\n | Call trace:\n |  purge_fragmented_block+0x204/0x21c\n |  _vm_unmap_aliases+0x170/0x378\n |  vm_unmap_aliases+0x1c/0x28\n |  change_memory_common+0x1dc/0x26c\n |  set_memory_ro+0x18/0x24\n |  module_enable_ro+0x98/0x238\n |  do_init_module+0x1b0/0x310\n\nMove the initialisation of \u0027vb-\u003ecpu\u0027 in new_vmap_block() ahead of the\naddition to the xarray."
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