# CVE-2024-36925: linux: In the Linux kernel, the following vulnerability has been resolved:  swiotlb: initialise restricted pool list_head wh...

CVE-2024-36925 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-36925, released May 30, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-36925
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 30, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  swiotlb: initialise restricted pool list_head when SWIOTLB_DYNAMIC=y  Using restricted DMA pools (CONFIG_DMA_RESTRICTED_POOL=y) in conjunction with dynamic SWIOTLB (CONFIG_SWIOTLB_DYNAMIC=y) leads to the following crash when initialising the restricted pools at boot-time:    | Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008   | Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP   | pc : rmem_swiotlb_device_init+0xfc/0x1ec   | lr : rmem_swiotlb_device_init+0xf0/0x1ec   | Call trace:   |  rmem_swiotlb_device_init+0xfc/0x1ec   |  of_reserved_mem_device_init_by_idx+0x18c/0x238   |  of_dma_configure_id+0x31c/0x33c   |  platform_dma_configure+0x34/0x80  faddr2line reveals that the crash is in the list validation code:    include/linux/list.h:83   include/linux/rculist.h:79   include/linux/rculist.h:106   kernel/dma/swiotlb.c:306   kernel/dma/swiotlb.c:1695  because add_mem_pool() is trying to list_add_rcu() to a NULL 'mem->pools'.  Fix the crash by initialising the 'mem->pools' list_head in rmem_swiotlb_device_init() before calling add_mem_pool().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.8.11-1 | [DEBIAN-CVE-2024-36925](https://patchblox.com/security/data/fix/linux/debian-cve-2024-36925.md) | May 30, 2024 |
| Linux | linux Debian 14 | 6.8.11-1 | [DEBIAN-CVE-2024-36925](https://patchblox.com/security/data/fix/linux/debian-cve-2024-36925.md) | May 30, 2024 |

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