CVE-2026-89919

KVM: s390: keyop: use mmu_lock to read gmap->asce

State: Published
Severity: 7.8 High
Published: Sep 16, 2026
Updated: Oct 19, 2026
Reserved: Sep 11, 2026

Description

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

KVM: s390: keyop: use mmu_lock to read gmap->asce

Every other dat_* consumer in this file (kvm_s390_get_skeys, set_skeys, get_cmma_bits, set_cmma_bits, MEM_CLR_CMMA, kvm_s390_fixup_prefix, kvm_test_age_gfn, kvm_age_gfn) reads kvm->arch.gmap->asce *inside* the mmu_lock read-side. keyop is the only outlier.

gmap->asce is mutated under write_lock(mmu_lock) by gmap_set_limit() and keyop might use a stale asce value for walking as KVM_S390_KEYOP and KVM_S390_VM_MEM_LIMIT_SIZE can run concurrently. This can result in memory corruption.

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

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	0ee4ddc1647b8b3b9e7a94d798a1774a764428c1 to before ae452b990e0544425f77045351c56e77158858e7Affected 0ee4ddc1647b8b3b9e7a94d798a1774a764428c1 to before da07a751efa4583385f9f0f47113549fe8871242Affected
LinuxLinux	7.0Affected before 7.0Not affected 7.2.5 through 7.2.*Not affected 7.3 and laterNot affected

References

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