7.8

CVE-2026-23554: Use after free of paging structures in EPT

Analyzed
AliasesALPINE-CVE-2026-23554MGASA-2026-0068SUSE-SU-2026:1092-1
Published 23-03-2026Last modified 23-03-2026

Vulnerability summary

CVE-2026-23554 is a high (CVSS 7.8) vulnerability in xen. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.6% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.13%
0%100%
Low · 0.00 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 3 · Related 3
OPENSUSE-SU-2026:10457-1SUSE-SU-2026:0908-1SUSE-SU-2026:1093-1

Timeline

  1. 23-03-2026
    PublishedVulnerability first disclosed.
  2. 23-03-2026
    Last modifiedVulnerability information updated.

Description

The Intel EPT paging code uses an optimization to defer flushing of any cached EPT state until the p2m lock is dropped, so that multiple modifications done under the same locked region only issue a single flush. Freeing of paging structures however is not deferred until the flushing is done, and can result in freed pages transiently being present in cached state. Such stale entries can point to memory ranges not owned by the guest, thus allowing access to unintended memory regions.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.13% 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: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Suse5 products
  • xen&distro=SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS< 4.17.6_06-150500.3.62.2
  • xen&distro=SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS< 4.17.6_06-150500.3.62.2
  • xen&distro=SUSE Linux Enterprise Micro 5.5< 4.17.6_06-150500.3.62.2
  • xen&distro=SUSE Linux Enterprise Server 15 SP5-LTSS< 4.17.6_06-150500.3.62.2
  • xen&distro=SUSE Linux Enterprise Server for SAP Applications 15 SP5< 4.17.6_06-150500.3.62.2
Alpine1 product
  • xen≥ 4.17, < 4.18.5-r5 | ≥ 4.17, < 4.19.4-r2 | ≥ 4.17, < 4.20.2-r2 | ≥ 4.17, < 4.21.0-r3
Debian1 product
  • xen< 4.17.7-0+deb12u1 | < 4.20.3+127-gc42374a105-0+deb13u1 | < 4.20.3+127-gc42374a105-1
Mageia1 product
  • xen< 4.17.5-1.git20251028.3.mga9
Ubuntu1 product
  • xenAll versions (No fix recorded)
Xen1 product
  • xen≥ 4.17 (No fix recorded)

6 vendors · 10 products

References

14 links
Show all 14 references