Kernel compromise via DIBS teardown use-after-free
Published Aug 22, 2026 · Updated Aug 25, 2026
Use-after-free in the Linux kernel DIBS driver allows attackers to read or alter kernel memory via crafted SMC-D traffic. The interrupt handler can read dmb_clientid_arr after dibs_dev_del() frees it, while a dibs_dev_add() failure can free the array twice. Exploitation requires an SMC-D peer on the same IBM Z CPC or HiperSockets domain to sustain traffic during device teardown, enabling kernel memory disclosure, corruption, control-flow hijacking, or a kernel panic.
Summary
What happened
Use-after-free in the Linux kernel DIBS driver allows attackers to read or alter kernel memory via crafted SMC-D traffic. The interrupt handler can read dmb_clientid_arr after dibs_dev_del() frees it, while a dibs_dev_add() failure can free the array twice. Exploitation requires an SMC-D peer on the same IBM Z CPC or HiperSockets domain to sustain traffic during device teardown, enabling kernel memory disclosure, corruption, control-flow hijacking, or a kernel panic.
The record
- CVE
- CVE-2026-74629
- Published
- Aug 22, 2026
- Updated
- Aug 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-416, T1499.004
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 22, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.18
- Affected versionversion=cc21191b584c6f7836b0f10774f8278b7cbfba10 <7a1df20a8d2cc89e3a442b6e0b43b1cacde8d403
- Affected versionversion=cc21191b584c6f7836b0f10774f8278b7cbfba10 <9e6869be49064915edb6c8776b27c376cfdb0df5
- Affected versionversion=cc21191b584c6f7836b0f10774f8278b7cbfba10 <ece6426b61241e9bfb41aa131f235168f55229b1
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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