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CVE-2024-26786

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: iommufd: Fix iopt_access_list_id overwrite bug Syzkaller reported the following WARN_ON: WARNING: CPU: 1 PID: 4738 at drivers…

Published Apr 4, 2024CWE-476EPSS 0.23%

Overview

CVE-2024-26786 is a high-severity vulnerability. It was published on April 4, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

iommufd: Fix iopt_access_list_id overwrite bug

Syzkaller reported the following WARN_ON:

WARNING: CPU: 1 PID: 4738 at drivers/iommu/iommufd/io_pagetable.c:1360

Call Trace:

iommufd_access_change_ioas+0x2fe/0x4e0

iommufd_access_destroy_object+0x50/0xb0

iommufd_object_remove+0x2a3/0x490

iommufd_object_destroy_user

iommufd_access_destroy+0x71/0xb0

iommufd_test_staccess_release+0x89/0xd0

__fput+0x272/0xb50

__fput_sync+0x4b/0x60

__do_sys_close

__se_sys_close

__x64_sys_close+0x8b/0x110

do_syscall_x64

The mismatch between the access pointer in the list and the passed-in

pointer is resulting from an overwrite of access->iopt_access_list_id, in

iopt_add_access(). Called from iommufd_access_change_ioas() when

xa_alloc() succeeds but iopt_calculate_iova_alignment() fails.

Add a new_id in iopt_add_access() and only update iopt_access_list_id when

returning successfully.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/9526a46cc0c378d381560279bea9aa34c84298a0Refgit.kernel.org/stable/c/aeb004c0cd6958e910123a1607634401009c9539Refgit.kernel.org/stable/c/f1fb745ee0a6fe43f1d84ec369c7e6af2310fda9Refgit.kernel.org/stable/c/9526a46cc0c378d381560279bea9aa34c84298a0Refgit.kernel.org/stable/c/aeb004c0cd6958e910123a1607634401009c9539Refgit.kernel.org/stable/c/f1fb745ee0a6fe43f1d84ec369c7e6af2310fda9

How CyberStrike helps

Frequently asked questions

What is CVE-2024-26786?

CVE-2024-26786 is a high-severity vulnerability. It was published on April 4, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-26786?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2024-26786?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2024-26786?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-26786 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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