# CVE-2023-53630: linux: In the Linux kernel, the following vulnerability has been resolved:  iommufd: Fix unpinning of pages when an access i...

CVE-2023-53630 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-53630, released October 7, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-53630
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 7, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  iommufd: Fix unpinning of pages when an access is present  syzkaller found that the calculation of batch_last_index should use 'start_index' since at input to this function the batch is either empty or it has already been adjusted to cross any accesses so it will start at the point we are unmapping from.  Getting this wrong causes the unmap to run over the end of the pages which corrupts pages that were never mapped. In most cases this triggers the num pinned debugging:    WARNING: CPU: 0 PID: 557 at drivers/iommu/iommufd/pages.c:294 __iopt_area_unfill_domain+0x152/0x560   Modules linked in:   CPU: 0 PID: 557 Comm: repro Not tainted 6.3.0-rc2-eeac8ede1755 #1   Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014   RIP: 0010:__iopt_area_unfill_domain+0x152/0x560   Code: d2 0f ff 44 8b 64 24 54 48 8b 44 24 48 31 ff 44 89 e6 48 89 44 24 38 e8 fc d3 0f ff 45 85 e4 0f 85 eb 01 00 00 e8 0e d2 0f ff <0f> 0b e8 07 d2 0f ff 48 8b 44 24 38 89 5c 24 58 89 18 8b 44 24 54   RSP: 0018:ffffc9000108baf0 EFLAGS: 00010246   RAX: 0000000000000000 RBX: 00000000ffffffff RCX: ffffffff821e3f85   RDX: 0000000000000000 RSI: ffff88800faf0000 RDI: 0000000000000002   RBP: ffffc9000108bd18 R08: 000000000003ca25 R09: 0000000000000014   R10: 000000000003ca00 R11: 0000000000000024 R12: 0000000000000004   R13: 0000000000000801 R14: 00000000000007ff R15: 0000000000000800   FS:  00007f3499ce1740(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033   CR2: 0000000020000243 CR3: 00000000179c2001 CR4: 0000000000770ef0   PKRU: 55555554   Call Trace:    <TASK>    iopt_area_unfill_domain+0x32/0x40    iopt_table_remove_domain+0x23f/0x4c0    iommufd_device_selftest_detach+0x3a/0x90    iommufd_selftest_destroy+0x55/0x70    iommufd_object_destroy_user+0xce/0x130    iommufd_destroy+0xa2/0xc0    iommufd_fops_ioctl+0x206/0x330    __x64_sys_ioctl+0x10e/0x160    do_syscall_64+0x3b/0x90    entry_SYSCALL_64_after_hwframe+0x72/0xdc  Also add some useful WARN_ON sanity checks.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.3.7-1 | [DEBIAN-CVE-2023-53630](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53630.md) | Oct 7, 2025 |
| Linux | linux Debian 14 | 6.3.7-1 | [DEBIAN-CVE-2023-53630](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53630.md) | Oct 7, 2025 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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