# CVE-2024-35957: iommu/vt-d: Fix WARN_ON in iommu probe path

> A kernel bug in the Intel IOMMU driver causes a warning and probe failure on certain platforms, leading to a denial of service.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 20 May 2024
- **Updated:** 11 May 2026
- **Also known as:** DEBIAN-CVE-2024-35957, GHSA-24w8-46cp-j5f8, UBUNTU-CVE-2024-35957

## What is CVE-2024-35957?

CVE-2024-35957 is a medium-severity denial of service vulnerability in Linux kernel, published on 20 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

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

iommu/vt-d: Fix WARN_ON in iommu probe path

Commit 1a75cc710b95 ("iommu/vt-d: Use rbtree to track iommu probed
devices") adds all devices probed by the iommu driver in a rbtree
indexed by the source ID of each device. It assumes that each device
has a unique source ID. This assumption is incorrect and the VT-d
spec doesn't state this requirement either.

The reason for using a rbtree to track devices is to look up the device
with PCI bus and devfunc in the paths of handling ATS invalidation time
out error and the PRI I/O page faults. Both are PCI ATS feature related.

Only track the devices that have PCI ATS capabilities in the rbtree to
avoid unnecessary WARN_ON in the iommu probe path. Otherwise, on some
platforms below kernel splat will be displayed and the iommu probe results
in failure.

 WARNING: CPU: 3 PID: 166 at drivers/iommu/intel/iommu.c:158 intel_iommu_probe_device+0x319/0xd90
 Call Trace:
  <TASK>
  ? __warn+0x7e/0x180
  ? intel_iommu_probe_device+0x319/0xd90
  ? report_bug+0x1f8/0x200
  ? handle_bug+0x3c/0x70
  ? exc_invalid_op+0x18/0x70
  ? asm_exc_invalid_op+0x1a/0x20
  ? intel_iommu_probe_device+0x319/0xd90
  ? debug_mutex_init+0x37/0x50
  __iommu_probe_device+0xf2/0x4f0
  iommu_probe_device+0x22/0x70
  iommu_bus_notifier+0x1e/0x40
  notifier_call_chain+0x46/0x150
  blocking_notifier_call_chain+0x42/0x60
  bus_notify+0x2f/0x50
  device_add+0x5ed/0x7e0
  platform_device_add+0xf5/0x240
  mfd_add_devices+0x3f9/0x500
  ? preempt_count_add+0x4c/0xa0
  ? up_write+0xa2/0x1b0
  ? __debugfs_create_file+0xe3/0x150
  intel_lpss_probe+0x49f/0x5b0
  ? pci_conf1_write+0xa3/0xf0
  intel_lpss_pci_probe+0xcf/0x110 [intel_lpss_pci]
  pci_device_probe+0x95/0x120
  really_probe+0xd9/0x370
  ? __pfx___driver_attach+0x10/0x10
  __driver_probe_device+0x73/0x150
  driver_probe_device+0x19/0xa0
  __driver_attach+0xb6/0x180
  ? __pfx___driver_attach+0x10/0x10
  bus_for_each_dev+0x77/0xd0
  bus_add_driver+0x114/0x210
  driver_register+0x5b/0x110
  ? __pfx_intel_lpss_pci_driver_init+0x10/0x10 [intel_lpss_pci]
  do_one_initcall+0x57/0x2b0
  ? kmalloc_trace+0x21e/0x280
  ? do_init_module+0x1e/0x210
  do_init_module+0x5f/0x210
  load_module+0x1d37/0x1fc0
  ? init_module_from_file+0x86/0xd0
  init_module_from_file+0x86/0xd0
  idempotent_init_module+0x17c/0x230
  __x64_sys_finit_module+0x56/0xb0
  do_syscall_64+0x6e/0x140
  entry_SYSCALL_64_after_hwframe+0x71/0x79

Weakness: CWE-617 (Reachable Assertion)

## Which versions are affected by CVE-2024-35957?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2024-35957?

Apply the vendor's patch.

## Is CVE-2024-35957 being exploited?

There is no known exploitation of CVE-2024-35957 in the wild and no public exploit code.

## Other vulnerabilities in Linux kernel

- [CVE-2026-53266](https://insights.sbomify.com/CVE-2026-53266/): Linux Kernel Out-of-Bounds Write (high 8.8, exploited in the wild)
- [CVE-2013-6282](https://insights.sbomify.com/CVE-2013-6282/): Linux Kernel Improper Input Validation (high 8.8, exploited in the wild)
- [CVE-2022-0185](https://insights.sbomify.com/CVE-2022-0185/): Linux Kernel Heap-Based Buffer Overflow (high 8.4, exploited in the wild)
- [CVE-2013-2094](https://insights.sbomify.com/CVE-2013-2094/): Linux Kernel Privilege Escalation (high 8.4, exploited in the wild)
- [CVE-2026-53362](https://insights.sbomify.com/CVE-2026-53362/): Linux Kernel Unspecified (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-35957 and fix it if it is affected.

What it is: CVE-2024-35957 is a medium-severity denial of service vulnerability in Linux kernel, published on 20 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-35957 in the wild and no public exploit code.

Affected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2024-35957/ (Markdown: https://insights.sbomify.com/CVE-2024-35957/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-35957
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-35957
- OSV: https://osv.dev/vulnerability/CVE-2024-35957

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-35957/
Summaries are generated and may contain mistakes; the official description above is the record.