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NVD / CVE Program· CNA Linux

CVE-2022-49556: KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak

Noroxi assessment

Priority: Monitor (action score 28/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.27% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 401bef1f95de92c3a8c6eece46e02fa88d7285ee, 57a01725339f9d82b099102ba2751621b1caab93, bbdcc644b59e01e98c68894a9fab42b9687f42b0.

Low priority for now. Upgrade to Linux Linux 401bef1f95de92c3a8c6eece46e02fa88d7285ee, 57a01725339f9d82b099102ba2751621b1caab93, bbdcc644b59e01e98c68894a9fab42b9687f42b0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak For some sev ioctl interfaces, the length parameter that is passed maybe less than or equal to SEV_FW_BLOB_MAX_SIZE, but larger than the data that PSP firmware returns. In this case, kmalloc will allocate memory that is the size of the input rather than the size of the data. Since PSP firmware doesn't fully overwrite the allocated buffer, these sev ioctl interface may return uninitialized kernel slab memory.

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Feb 26, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 19th percentile
CWE
—

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.7 and later · before 5.10.124
  • linux linux kernel5.11 and later · before 5.15.45
  • linux linux kernel5.16 and later · before 5.17.13
  • linux linux kernel5.18 and later · before 5.18.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.7affected
    • eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 and later · before 401bef1f95de92c3a8c6eece46e02fa88d7285eeaffected · git
    • eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 and later · before d8fdb4b24097472ff6b3c0559448200d420b1418affected · git
    • eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 and later · before bbdcc644b59e01e98c68894a9fab42b9687f42b0affected · git
    • eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 and later · before 57a01725339f9d82b099102ba2751621b1caab93affected · git
    • eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 and later · before d22d2474e3953996f03528b84b7f52cc26a39403affected · git
    • before 5.7not affected · semver
    • 5.10.124 and later · up to and including 5.10.*not affected · semver
    • 5.15.45 and later · up to and including 5.15.*not affected · semver
    • 5.17.13 and later · up to and including 5.17.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.18.2-15.18.2-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2022-49553Feb 26, 2025 · fs/ntfs3: validate BOOT sectors_per_clusters
    22Monitor
  • ← EarlierCVE-2022-49555Feb 26, 2025 · Bluetooth: hci_qca: Use del_timer_sync() before freeing
    22Monitor
  • Later →CVE-2022-49557Feb 26, 2025 · x86/fpu: KVM: Set the base guest FPU uABI size to sizeof(struct kvm_xsave)
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux401bef1f95de92c3a8c6eece46e02fa88d7285eeVendor (CNA)
Linux Linux57a01725339f9d82b099102ba2751621b1caab93Vendor (CNA)
Linux Linuxbbdcc644b59e01e98c68894a9fab42b9687f42b0Vendor (CNA)
Linux Linuxd22d2474e3953996f03528b84b7f52cc26a39403Vendor (CNA)
Linux Linuxd8fdb4b24097472ff6b3c0559448200d420b1418Vendor (CNA)
debian:linux5.18.2-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records