Critical 9.3Published Dec 7, 2025

CVE-2023-53769virt/coco/sev-guest: Double-buffer messages

Updated under an hour ago (Oct 26, 2026, 4:10 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: virt/coco/sev-guest: Double-buffer messages The encryption algorithms read and write directly to shared unencrypted memory, which may leak information as well as permit the host to tamper with the message integrity. Instead, copy whole messages in or out as needed before doing any computation on them.

CVSS: 9.3 CRITICAL (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Deferred
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from d5af44dde5461d125d1602ac913ab5c6bdf09b8b before 577a64725bfd77645986168e953d405067ee565b; from d5af44dde5461d125d1602ac913ab5c6bdf09b8b before c27dafc4aa50a29ec927b3aa84ac7b430071f682; from d5af44dde5461d125d1602ac913ab5c6bdf09b8b before 4b69c63f716cfda38e1210e65b68f67f6cee2ddf; from d5af44dde5461d125d1602ac913ab5c6bdf09b8b before 965006103a14703cc42043bbf9b5e0cdf7a468ad	CNA record

References

References

https://git.kernel.org/stable/c/577a64725bfd77645986168e953d405067ee565b
https://git.kernel.org/stable/c/c27dafc4aa50a29ec927b3aa84ac7b430071f682
https://git.kernel.org/stable/c/4b69c63f716cfda38e1210e65b68f67f6cee2ddf
https://git.kernel.org/stable/c/965006103a14703cc42043bbf9b5e0cdf7a468ad

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.