01 Record

CVE-2026-31788

xen/privcmd: restrict usage in unprivileged domU

HighPUBLISHEDCNA: Linux

CNA base score8.2 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

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02 Description

xen/privcmd: restrict usage in unprivileged domU

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.19% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 8.8% of scored records. A rank, not a probability.

NVD base score

8.2 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-10-19.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-03-25 10:25Z7 MO AGO

Last updated

2026-10-19 19:06Z10 DAYS AGO

Reserved

2026-03-09

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 8.2)

CNA CVSS vector

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

Weaknesses

CWE-862Missing AuthorizationClass
CWE-266Incorrect Privilege AssignmentBase

Data version

5.2

Document digest

3d04c167521168cb3efadafa65a0c27390a5c8af54e3ca2019e5be9befe7421f

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux1c5de1939c204bde9cce87f4eb3d26e9f9eb732b to < 4eb245ff0d33b618e097a2c23de5df56d4ad6969, 1c5de1939c204bde9cce87f4eb3d26e9f9eb732b to < 3ee5b9e3de4b8bdd74183d83205481c91a9effc8, 1c5de1939c204bde9cce87f4eb3d26e9f9eb732b to < 87a803edb2ded911cb587c53bff179d2a2ed2a28, 1c5de1939c204bde9cce87f4eb3d26e9f9eb732b to < 1879319d790f7d57622cdc22807b60ea78b56b6d, 1c5de1939c204bde9cce87f4eb3d26e9f9eb732b to < 78432d8f0372c71c518096395537fa12be7ff24e, 1c5de1939c204bde9cce87f4eb3d26e9f9eb732b to < 389bae9a4409934e8b8d4dbdaaf02a3ae71cf8e4, 1c5de1939c204bde9cce87f4eb3d26e9f9eb732b to < cbede2e833da1893afbea9b3ff29b5dda23a4a91, 1c5de1939c204bde9cce87f4eb3d26e9f9eb732b to < 453b8fb68f3641fea970db88b7d9a153ed2a37e8, 2.6.37—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/4eb245ff0d33b618e097a2c23de5df56d4ad6969
git.kernel.orghttps://git.kernel.org/stable/c/3ee5b9e3de4b8bdd74183d83205481c91a9effc8
git.kernel.orghttps://git.kernel.org/stable/c/87a803edb2ded911cb587c53bff179d2a2ed2a28
git.kernel.orghttps://git.kernel.org/stable/c/1879319d790f7d57622cdc22807b60ea78b56b6d
git.kernel.orghttps://git.kernel.org/stable/c/78432d8f0372c71c518096395537fa12be7ff24e
git.kernel.orghttps://git.kernel.org/stable/c/389bae9a4409934e8b8d4dbdaaf02a3ae71cf8e4
git.kernel.orghttps://git.kernel.org/stable/c/cbede2e833da1893afbea9b3ff29b5dda23a4a91
git.kernel.orghttps://git.kernel.org/stable/c/453b8fb68f3641fea970db88b7d9a153ed2a37e8
xenbits.xen.orghttp://xenbits.xen.org/xsa/advisory-482.html
www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/03/24/2
www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/03/24/3
www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/03/24/4
www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/03/24/5
www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/03/26/4

07 Fixed in

Debian 12

linux
Fixed in 6.1.170-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

linux
Fixed in 6.12.85-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 6.19.10-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.