🛡️ CVE-2024-26785 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

iommufd: Fix protection fault in iommufd_test_syz_conv_iova

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

iommufd: Fix protection fault in iommufd_test_syz_conv_iova

Syzkaller reported the following bug:

general protection fault, probably for non-canonical address 0xdffffc0000000038: 0000 [#1] SMP KASAN

KASAN: null-ptr-deref in range [0x00000000000001c0-0x00000000000001c7]

Call Trace:

lock_acquire

lock_acquire+0x1ce/0x4f0

down_read+0x93/0x4a0

iommufd_test_syz_conv_iova+0x56/0x1f0

iommufd_test_access_rw.isra.0+0x2ec/0x390

iommufd_test+0x1058/0x1e30

iommufd_fops_ioctl+0x381/0x510

vfs_ioctl

__do_sys_ioctl

__se_sys_ioctl

__x64_sys_ioctl+0x170/0x1e0

do_syscall_x64

do_syscall_64+0x71/0x140

This is because the new iommufd_access_change_ioas() sets access->ioas to

NULL during its process, so the lock might be gone in a concurrent racing

context.

Fix this by doing the same access->ioas sanity as iommufd_access_rw() and

iommufd_access_pin_pages() functions do.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2024-26785 is recorded against 2 packages.

  • kernel (from 6.7.0 up to 6.7.9)
  • linux-kernel

Timeline and source

Published on 4 April 2024 and last revised on 15 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2024-26785 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2024-04-04
Updated 2026-08-12
Modified 2026-07-15

Affected Packages

Software From version Fixed in
kernel 6.7.0 6.7.9
linux-kernel — —

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