Kernel crash via concurrent cleared ioas pointer
Published Apr 4, 2024 · Updated May 11, 2026
Null-pointer dereference in Linux kernel 6.6 allows local users to crash the kernel through a concurrent iommufd self-test ioctl. iommufd_access_change_ioas() clears access->ioas while iommufd_test_syz_conv_iova() concurrently tries to lock through that pointer without first checking it. Exploitation requires local low-privileged access and the iommufd self-test interface; the reported consequence is a kernel protection fault and service interruption.
Summary
What happened
Null-pointer dereference in Linux kernel 6.6 allows local users to crash the kernel through a concurrent iommufd self-test ioctl. iommufd_access_change_ioas() clears access->ioas while iommufd_test_syz_conv_iova() concurrently tries to lock through that pointer without first checking it. Exploitation requires local low-privileged access and the iommufd self-test interface; the reported consequence is a kernel protection fault and service interruption.
The record
- CVE
- CVE-2024-26785
- Published
- Apr 4, 2024
- Updated
- May 11, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-120, T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 4, 2024CVE publishedPublication date reported by the CVE source.
- May 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=6.6
- Affected versionversion=9227da7816dd1a42e20d41e2244cb63c205477ca <cf7c2789822db8b5efa34f5ebcf1621bc0008d48
- Affected versionversion=9227da7816dd1a42e20d41e2244cb63c205477ca <fc719ecbca45c9c046640d72baddba3d83e0bc0b
- Affected versionversion=9227da7816dd1a42e20d41e2244cb63c205477ca <fd4d5cd7a2e8f08357c9bfc0905957cffe8ce568
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What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
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Technologies
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Your stack
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