7.3

CVE-2026-62433: correct buffer checks for DM_OP hypercalls

Deferred
AliasesALPINE-CVE-2026-62433UBUNTU-CVE-2026-62433DEBIAN-CVE-2026-62433
Published 28-07-2026Last modified 28-07-2026

Vulnerability summary

CVE-2026-62433 is a high (CVSS 7.3) Improper Initialization vulnerability in xen. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 16.8% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.3 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.3/10
010
High · v3.1 (CVE.org)
EPSS score
0.25%
0%100%
Low · -0.15 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 6 · Related 6
OPENSUSE-SU-2026:11441-1SUSE-SU-2026:3409-1SUSE-SU-2026:3423-1SUSE-SU-2026:3451-1SUSE-SU-2026:3462-1SUSE-SU-2026:4090-1

Timeline

  1. 28-07-2026
    PublishedVulnerability first disclosed.
  2. 28-07-2026
    Last modifiedVulnerability information updated.

Description

Parts of the DM_OP handling code assumes the caller has provided the required number of buffers for the given operation without any checking being done. As a result, certain operations might access stack rubble as structures are possibly uninitialized.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

17%

Versus all other CVEs

30-day change

Decrease -0.15 pp

From 0.41% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Alpine1 product
  • xen< 4.19.6-r0 | < 4.20.4-r0 | < 4.21.2-r0
Debian1 product
  • xen< 4.17.7-0+deb12u1 | < 4.20.3+127-gc42374a105-0+deb13u1 | < 4.20.3+127-gc42374a105-1
Ubuntu1 product
  • xenAll versions (No fix recorded)

3 vendors · 3 products

References

8 links