Host stack-data disclosure via uninitialized DMSI vectors
Published Sep 16, 2026 · Updated Sep 16, 2026
Information disclosure in Linux 7.1 allows guest OS users to receive host stack data through LoongArch KVM DMSI interrupt injection. In dmsintc_inject_irq(), a zero vector-map entry leaves the matching stack array element unset, yet later code treats nonzero residue as an interrupt mask and writes it into a guest LOONGARCH_CSR_ISR register. The flaw is reachable only on LoongArch hosts using KVM's in-kernel DMSI controller; it exposes stale stack bits to a guest and can also inject spurious guest interrupts.
Summary
What happened
Information disclosure in Linux 7.1 allows guest OS users to receive host stack data through LoongArch KVM DMSI interrupt injection. In dmsintc_inject_irq(), a zero vector-map entry leaves the matching stack array element unset, yet later code treats nonzero residue as an interrupt mask and writes it into a guest LOONGARCH_CSR_ISR register. The flaw is reachable only on LoongArch hosts using KVM's in-kernel DMSI controller; it exposes stale stack bits to a guest and can also inject spurious guest interrupts.
The record
- CVE
- CVE-2026-89910
- Published
- Sep 16, 2026
- Updated
- Sep 16, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 16, 2026CVE publishedPublication date reported by the CVE source.
- Sep 16, 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=03de5eecb0f0f68f29086bc0075c7fd597bf4e4a <81aa3a58b542ed88819115c80a17acd86eacb89d
- Affected versionversion=03de5eecb0f0f68f29086bc0075c7fd597bf4e4a <f56060b0e10fa5633fac1dc243a25da3a5cdafb1
- Affected versionversion=7.1
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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Weakness, pattern, technique
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Public exploit references
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Technologies
Your stack
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Your stack
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