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Review reviewHigh

CVE-2026-52959

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: virt: sev-guest: Do not use host-controlled page order in cleanup path When issuing an extended guest request (SVM_VMGEXIT_EXT_GUEST_REQUEST), get_ext_report() allocates a buffer to retrieve a certificate blob from the host, keeping track of its size in report_req->certs_len. However, the host may return SNP_GUEST_VMM_ERR_INVALID_LEN, indicating an invalid buffer size, as well as the expected length of such buffer. get_ext_report() subsequently updates report_req->certs_len with the host-controlled value, and cleans up the...

CVSS
7.8
EPSS
0.09%
0.65% percentile
CISA KEV
Not listed
Published
2026.06.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.09%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: virt: sev-guest: Do not use host-controlled page order in cleanup path When issuing an extended guest request (SVM_VMGEXIT_EXT_GUEST_REQUEST), get_ext_report() allocates a buffer to retrieve a certificate blob from the host, keeping track of its size in report_req->certs_len. However, the host may return SNP_GUEST_VMM_ERR_INVALID_LEN, indicating an invalid buffer size, as well as the expected length of such buffer. get_ext_report() subsequently updates report_req->certs_len with the host-controlled value, and cleans up the...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 3e385c0d6ce88ac9916dcf84267bd5855d830748 < 3f6fb0211b39aaa1b841260681dd02ca6b693ed5, >= 3e385c0d6ce88ac9916dcf84267bd5855d830748 < 9e48b4f813d2c3db75d522aa82ab705ce04b7e2d, >= 3e385c0d6ce88ac9916dcf84267bd5855d830748 < 23e6a1ca04ae44806439a5a446e62e4d42e80bb4, >= 0b16521f95c875e79d657cb8d6911c15080dbb80, >= 6.13.8 < 6.14, >= 6.14, >= 6.14.1 < 6.18.33, >= 6.19 < 7.0.10, 6.14, 7.1
Fixed versions
6.14, 6.18.33, 7.0.10

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2026-52959 — Linux Linux, linux kernel | SECUFOCUS NOW