# CVE-2024-47719: iommufd: Protect against overflow of ALIGN() during iova allocation


- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 21 Oct 2024
- **Updated:** 11 May 2026
- **Also known as:** AZL-51243, BELL-CVE-2024-47719, DEBIAN-CVE-2024-47719, GHSA-2x3q-5xpc-rqf8, UBUNTU-CVE-2024-47719

## What is CVE-2024-47719?

CVE-2024-47719 is a high-severity vulnerability in Linux kernel, published on 21 Oct 2024. 

### Official description

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

iommufd: Protect against overflow of ALIGN() during iova allocation

Userspace can supply an iova and uptr such that the target iova alignment
becomes really big and ALIGN() overflows which corrupts the selected area
range during allocation. CONFIG_IOMMUFD_TEST can detect this:

   WARNING: CPU: 1 PID: 5092 at drivers/iommu/iommufd/io_pagetable.c:268 iopt_alloc_area_pages drivers/iommu/iommufd/io_pagetable.c:268 [inline]
   WARNING: CPU: 1 PID: 5092 at drivers/iommu/iommufd/io_pagetable.c:268 iopt_map_pages+0xf95/0x1050 drivers/iommu/iommufd/io_pagetable.c:352
   Modules linked in:
   CPU: 1 PID: 5092 Comm: syz-executor294 Not tainted 6.10.0-rc5-syzkaller-00294-g3ffea9a7a6f7 #0
   Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
   RIP: 0010:iopt_alloc_area_pages drivers/iommu/iommufd/io_pagetable.c:268 [inline]
   RIP: 0010:iopt_map_pages+0xf95/0x1050 drivers/iommu/iommufd/io_pagetable.c:352
   Code: fc e9 a4 f3 ff ff e8 1a 8b 4c fc 41 be e4 ff ff ff e9 8a f3 ff ff e8 0a 8b 4c fc 90 0f 0b 90 e9 37 f5 ff ff e8 fc 8a 4c fc 90 <0f> 0b 90 e9 68 f3 ff ff 48 c7 c1 ec 82 ad 8f 80 e1 07 80 c1 03 38
   RSP: 0018:ffffc90003ebf9e0 EFLAGS: 00010293
   RAX: ffffffff85499fa4 RBX: 00000000ffffffef RCX: ffff888079b49e00
   RDX: 0000000000000000 RSI: 00000000ffffffef RDI: 0000000000000000
   RBP: ffffc90003ebfc50 R08: ffffffff85499b30 R09: ffffffff85499942
   R10: 0000000000000002 R11: ffff888079b49e00 R12: ffff8880228e0010
   R13: 0000000000000000 R14: 1ffff920007d7f68 R15: ffffc90003ebfd00
   FS:  000055557d760380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
   CR2: 00000000005fdeb8 CR3: 000000007404a000 CR4: 00000000003506f0
   DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
   DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
   Call Trace:
    <TASK>
    iommufd_ioas_copy+0x610/0x7b0 drivers/iommu/iommufd/ioas.c:274
    iommufd_fops_ioctl+0x4d9/0x5a0 drivers/iommu/iommufd/main.c:421
    vfs_ioctl fs/ioctl.c:51 [inline]
    __do_sys_ioctl fs/ioctl.c:907 [inline]
    __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
    do_syscall_x64 arch/x86/entry/common.c:52 [inline]
    do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

Cap the automatic alignment to the huge page size, which is probably a
better idea overall. Huge automatic alignments can fragment and chew up
the available IOVA space without any reason.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2024-47719?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2024-47719?

Upgrade to a fixed version.

## Is CVE-2024-47719 being exploited?

There is no known exploitation of CVE-2024-47719 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-2024-47719 and fix it if it is affected.

What it is: CVE-2024-47719 is a high-severity vulnerability in Linux kernel, published on 21 Oct 2024. 
Exploitation: There is no known exploitation of CVE-2024-47719 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-2024-47719/ (Markdown: https://insights.sbomify.com/CVE-2024-47719/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-47719
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-47719
- OSV: https://osv.dev/vulnerability/CVE-2024-47719

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-47719/
Summaries are generated and may contain mistakes; the official description above is the record.