CVE-2026-90387

Summary

In the Linux kernel, the following vulnerability has been resolved:

swiotlb: Preserve allocation virtual address for dynamic pools

swiotlb_alloc_tlb() can allocate from the DMA atomic pool when a decrypted pool is needed from atomic context. With CONFIG_DMA_DIRECT_REMAP, the atomic pool is backed by remapped virtual addresses, which are not the same as the direct-map addresses returned by phys_to_virt().

swiotlb_init_io_tlb_pool() currently reconstructs the pool virtual address from the physical start address. For atomic-pool backed allocations this stores the wrong address in pool->vaddr. Later, swiotlb_free_tlb() passes that address to dma_free_from_pool(), which will fail to recognize the chunk

Pass the virtual address returned by the allocation path into swiotlb_init_io_tlb_pool(), and store that address in pool->vaddr. This keeps the pool free path using the same virtual address as the allocator.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux79636caad3618e2b38457f6e298c9b31ba82b489 < 68bf3ebd8e7020dae58e8aa14c7d482738bff9a8affected
LinuxLinux79636caad3618e2b38457f6e298c9b31ba82b489 < 45507dcb0847e96add4455274b12df0eca6590b4affected
LinuxLinux79636caad3618e2b38457f6e298c9b31ba82b489 < 35e0103177826430b5df888b1506239d41e76ab5affected
LinuxLinux79636caad3618e2b38457f6e298c9b31ba82b489 < c1f4d7763cdf1b9e0d35c14aa6f52d0512a36319affected
LinuxLinux79636caad3618e2b38457f6e298c9b31ba82b489 < 57d29044d0f29a76c6ec0c112c8c7371d5608dc7affected
LinuxLinux6.6affected
LinuxLinux0 < 6.6unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References