linux-cve-announce - CVE-2023-53327: iommufd/selftest: Catch overflow of uptr and length

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Message-ID: <2025091645-CVE-2023-53327-55c1@gregkh>
Date: Tue, 16 Sep 2025 18:12:12 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53327: iommufd/selftest: Catch overflow of uptr and length

From: Greg Kroah-Hartman <gregkh@...nel.org>

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.

The Linux kernel CVE team has assigned CVE-2023-53327 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.2 with commit f4b20bb34c83dceade5470288f48f94ce3598ada and fixed in 6.2.15 with commit adac6508c235a092b91ed9c0110ecf140e9e9441
	Issue introduced in 6.2 with commit f4b20bb34c83dceade5470288f48f94ce3598ada and fixed in 6.3.2 with commit 3fb3505636d033bbf7a0851dac63d01732c51d62
	Issue introduced in 6.2 with commit f4b20bb34c83dceade5470288f48f94ce3598ada and fixed in 6.4 with commit fd8c1a4aee973e87d890a5861e106625a33b2c4e

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2023-53327
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/iommu/iommufd/selftest.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/adac6508c235a092b91ed9c0110ecf140e9e9441
	https://git.kernel.org/stable/c/3fb3505636d033bbf7a0851dac63d01732c51d62
	https://git.kernel.org/stable/c/fd8c1a4aee973e87d890a5861e106625a33b2c4e