CVE-2024-26786

iommufd: Fix iopt_access_list_id overwrite bug

State: Published
Severity: 7.8 High
Published: Apr 4, 2024
Updated: Aug 5, 2026
Reserved: Feb 19, 2024

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-476 NULL Pointer Dereference

Affected Products

Product	Versions
LinuxLinux	9227da7816dd1a42e20d41e2244cb63c205477ca to before f1fb745ee0a6fe43f1d84ec369c7e6af2310fda9Affected 9227da7816dd1a42e20d41e2244cb63c205477ca to before 9526a46cc0c378d381560279bea9aa34c84298a0Affected 9227da7816dd1a42e20d41e2244cb63c205477ca to before aeb004c0cd6958e910123a1607634401009c9539Affected
LinuxLinux	6.6Affected before 6.6Not affected 6.6.21 through 6.6.Not affected 6.7.9 through 6.7.Not affected 6.8 and laterNot affected

References

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