KVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION

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Summary

CVECVE-2026-31590
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:36 UTC
Updated2026-06-01 17:16:49 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION Drop the WARN in sev_pin_memory() on npages overflowing an int, as the WARN is comically trivially to trigger from userspace, e.g. by doing: struct kvm_enc_region range = { .addr = 0, .size = -1ul, }; __vm_ioctl(vm, KVM_MEMORY_ENCRYPT_REG_REGION, &range); Note, the checks in sev_mem_enc_register_region() that presumably exist to verify the incoming address+size are completely worthless, as both "addr" and "size" are u64s and SEV is 64-bit only, i.e. they _can't_ be greater than ULONG_MAX. That wart will be cleaned up in the near future. if (range->addr > ULONG_MAX || range->size > ULONG_MAX) return -EINVAL; Opportunistically add a comment to explain why the code calculates the number of pages the "hard" way, e.g. instead of just shifting @ulen.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000180000 probability, percentile 0.048130000 (date 2026-04-27)

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 6a8e3c82122737529b25ef2a048fbcc569d8c055 git Not specified
CNA Linux Linux affected 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 a703933bcfa5cc76ca10e2048464600e74136099 git Not specified
CNA Linux Linux affected 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 abcd43ff579abd0a654bb4636086e78819dd5f4c git Not specified
CNA Linux Linux affected 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 b670833749ffd8681361db2bb047c6f2e3075f3a git Not specified
CNA Linux Linux affected 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 ab423e5892826202a660b5ac85d1125b0e8301a5 git Not specified
CNA Linux Linux affected 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 28cc13ca20431b127d42d84ba10898d03e2c8267 git Not specified
CNA Linux Linux affected 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 c29ff288a2d97a6f4640a498a367cf0eb91312eb git Not specified
CNA Linux Linux affected 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 1cba4dcd795daf6d257122779fb6a349edf03914 git Not specified
CNA Linux Linux affected 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 8acffeef5ef720c35e513e322ab08e32683f32f2 git Not specified
CNA Linux Linux affected 5.9 Not specified
CNA Linux Linux unaffected 5.9 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.136 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0.1 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/abcd43ff579abd0a654bb4636086e78819dd5f4c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ab423e5892826202a660b5ac85d1125b0e8301a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/28cc13ca20431b127d42d84ba10898d03e2c8267 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a703933bcfa5cc76ca10e2048464600e74136099 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b670833749ffd8681361db2bb047c6f2e3075f3a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c29ff288a2d97a6f4640a498a367cf0eb91312eb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6a8e3c82122737529b25ef2a048fbcc569d8c055 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8acffeef5ef720c35e513e322ab08e32683f32f2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1cba4dcd795daf6d257122779fb6a349edf03914 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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