# CVE-2023-53327: linux: In the Linux kernel, the following vulnerability has been resolved:  iommufd/selftest: Catch overflow of uptr and len...

CVE-2023-53327 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-53327, released September 16, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-53327
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0015
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 16, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  iommufd/selftest: Catch overflow of uptr and length  syzkaller hits a WARN_ON when trying to have a uptr close to UINTPTR_MAX:    WARNING: CPU: 1 PID: 393 at drivers/iommu/iommufd/selftest.c:403 iommufd_test+0xb19/0x16f0   Modules linked in:   CPU: 1 PID: 393 Comm: repro Not tainted 6.2.0-c9c3395d5e3d #1   Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014   RIP: 0010:iommufd_test+0xb19/0x16f0   Code: 94 c4 31 ff 44 89 e6 e8 a5 54 17 ff 45 84 e4 0f 85 bb 0b 00 00 41 be fb ff ff ff e8 31 53 17 ff e9 a0 f7 ff ff e8 27 53 17 ff <0f> 0b 41 be 8   RSP: 0018:ffffc90000eabdc0 EFLAGS: 00010246   RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8214c487   RDX: 0000000000000000 RSI: ffff88800f5c8000 RDI: 0000000000000002   RBP: ffffc90000eabe48 R08: 0000000000000000 R09: 0000000000000001   R10: 0000000000000001 R11: 0000000000000000 R12: 00000000cd2b0000   R13: 00000000cd2af000 R14: 0000000000000000 R15: ffffc90000eabe68   FS:  00007f94d76d5740(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033   CR2: 0000000020000043 CR3: 0000000006880006 CR4: 0000000000770ee0   PKRU: 55555554   Call Trace:    <TASK>    ? write_comp_data+0x2f/0x90    iommufd_fops_ioctl+0x1ef/0x310    __x64_sys_ioctl+0x10e/0x160    ? __pfx_iommufd_fops_ioctl+0x10/0x10    do_syscall_64+0x3b/0x90    entry_SYSCALL_64_after_hwframe+0x72/0xdc  Check that the user memory range doesn't overflow.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.3.7-1 | [DEBIAN-CVE-2023-53327](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53327.md) | Sep 16, 2025 |
| Linux | linux Debian 14 | 6.3.7-1 | [DEBIAN-CVE-2023-53327](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53327.md) | Sep 16, 2025 |

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