CVE-2026-52959

Guest memory corruption via host-controlled cleanup size

Published Jun 24, 2026 · Updated Jun 24, 2026

Memory corruption in Linux Kernel allows attackers controlling an SEV-SNP host to corrupt guest page allocator state through a crafted length response. In get_ext_report(), an invalid-length host response overwrites certs_len, which is then converted into a page order that can differ from the certificate buffer's original allocation. Triggering requires an extended guest request and a host-supplied SNP_GUEST_VMM_ERR_INVALID_LEN response; corruption occurs when the guest frees the buffer.

CVSS severity7.8
High
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Linux Kernel allows attackers controlling an SEV-SNP host to corrupt guest page allocator state through a crafted length response. In get_ext_report(), an invalid-length host response overwrites certs_len, which is then converted into a page order that can differ from the certificate buffer's original allocation. Triggering requires an extended guest request and a host-supplied SNP_GUEST_VMM_ERR_INVALID_LEN response; corruption occurs when the guest frees the buffer.

The record

CVE
CVE-2026-52959
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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.

  1. Affected versionversion=0b16521f95c875e79d657cb8d6911c15080dbb80
  2. Affected versionversion=3e385c0d6ce88ac9916dcf84267bd5855d830748 <23e6a1ca04ae44806439a5a446e62e4d42e80bb4
  3. Affected versionversion=3e385c0d6ce88ac9916dcf84267bd5855d830748 <3f6fb0211b39aaa1b841260681dd02ca6b693ed5
  4. Affected versionversion=3e385c0d6ce88ac9916dcf84267bd5855d830748 <9e48b4f813d2c3db75d522aa82ab705ce04b7e2d
  5. Affected versionversion=6.13.8 <6.14
  6. Affected versionversion=6.14

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0b16521f95c875e79d657cb8d6911c15080dbb80; version=3e385c0d6ce88ac9916dcf84267bd5855d830748 <23e6a1ca04ae44806439a5a446e62e4d42e80bb4; version=3e385c0d6ce88ac9916dcf84267bd5855d830748 <3f6fb0211b39aaa1b841260681dd02ca6b693ed5; version=3e385c0d6ce88ac9916dcf84267bd5855d830748 <9e48b4f813d2c3db75d522aa82ab705ce04b7e2d; version=6.13.8 <6.14; version=6.14

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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