Answer in brief
CVE-2024-35814 records a High severity (CVSS 7.8) vulnerability in swiotlb: Fix double-allocation of slots due to broken alignment handling. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), linux/linux_kernel (generic), linux/linux_kernel (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), linux/linux_kernel (generic), linux/linux_kernel (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=0eee5ae1025699ea93d44fdb6ef2365505082103 <3e7acd6e25ba77dde48c3b721c54c89cd6a10534 || >=0eee5ae1025699ea93d44fdb6ef2365505082103 <c88668aa6c1da240ea3eb4d128b7906e740d3cb8 || >=0eee5ae1025699ea93d44fdb6ef2365505082103 <777391743771040e12cc40d3d0d178f70c616491 || >=0eee5ae1025699ea93d44fdb6ef2365505082103 <04867a7a33324c9c562ee7949dbcaab7aaad1fb4 | 3e7acd6e25ba77dde48c3b721c54c89cd6a10534, c88668aa6c1da240ea3eb4d128b7906e740d3cb8, 777391743771040e12cc40d3d0d178f70c616491, 04867a7a33324c9c562ee7949dbcaab7aaad1fb4 |
| Linux/Linuxgeneric | 6.3 | Not reported |
| linux/linux_kernelgeneric | >=0eee5ae10256 <04867a7a3332 | 04867a7a3332 |
| linux/linux_kernelgeneric | 6.3 | Not reported |
| linux/linux_kernelgeneric | >=0eee5ae10256 <3e7acd6e25ba | 3e7acd6e25ba |
| linux/linux_kernelgeneric | >=0eee5ae10256 <c88668aa6c1d | c88668aa6c1d |
| linux/linux_kernelgeneric | >=0eee5ae10256 <777391743771 | 777391743771 |
Published upstream
May 17, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: swiotlb: Fix double-allocation of slots due to broken alignment handling Commit bbb73a103fbb ("swiotlb: fix a braino in the alignment check fix"), which was a fix for commit 0eee5ae10256 ("swiotlb: fix slot alignment checks"), causes a functional regression with vsock in a virtual machine using bouncing via a restricted DMA SWIOTLB pool. When virtio allocates the virtqueues for the vsock device using dma_alloc_coherent(), the SWIOTLB search can return page-unaligned allocations if 'area->index' was left unaligned by a previous allocation from the buffer: # Final address in brackets is the SWIOTLB address returned to the caller | virtio-pci 0000:00:07.0: orig_addr 0x0 alloc_size 0x2000, iotlb_align_mask 0x800 stride 0x2: got slot 1645-1649/7168 (0x98326800) | virtio-pci 0000:00:07.0: orig_addr 0x0 alloc_size 0x2000, iotlb_align_mask 0x800 stride 0x2: got slot 1649-1653/7168 (0x98328800) | virtio-pci 0000:00:07.0: orig_addr 0x0 alloc_size 0x2000, iotlb_align_mask 0x800 stride 0x2: got slot 1653-1657/7168 (0x9832a800) This ends badly (typically buffer corruption and/or a hang) because swiotlb_alloc() is expecting a page-aligned allocation and so blindly returns a pointer to the 'struct page' corresponding to the allocation, therefore double-allocating the first half (2KiB slot) of the 4KiB page. Fix the problem by treating the allocation alignment separately to any additional alignment requirements from the device, using the maximum of the two as the stride to search the buffer slots and taking care to ensure a minimum of page-alignment for buffers larger than a page. This also resolves swiotlb allocation failures occuring due to the inclusion of ~PAGE_MASK in 'iotlb_align_mask' for large allocations and resulting in alignment requirements exceeding swiotlb_max_mapping_size().
Quoted source text, attributed separately from HOL analysis.