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CVE-2026-102700

gnttab: cache-flush handling may cause page reference leak

4.7 MediumFix available

With its original introduction, GNTTAB_cache_flush was made available uniformly. XSA-232 (CVE-2017-14318) then covered an omitted NULL pointer check, yet the addition of that check failed to adjust the subsequent error path. That error path fails to drop a page reference in case the specified page is owned by a special system domain (DOM_IO and DOM_COW are system domains which can have memory pages assigned to them.)

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
High
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.15%Unchanged since Oct 14, 2026
90%50%10%1%

What each source reports

CVE List Score used 4.7

gnttab: cache-flush handling may cause page reference leak

With its original introduction, GNTTAB_cache_flush was made available uniformly. XSA-232 (CVE-2017-14318) then covered an omitted NULL pointer check, yet the addition of that check failed to adjust the subsequent error path. That error path fails to drop a page reference in case the specified page is owned by a special system domain (DOM_IO and DOM_COW are system domains which can have memory pages assigned to them.)

Record
CVE-2026-102700
CVSS 3.1
4.7 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-404
Updated
2026-11-02
EUVDEUVD-2026-98832 4.7

With its original introduction, GNTTAB_cache_flush was made available uniformly. XSA-232 (CVE-2017-14318) then covered an omitted NULL pointer check, yet the addition of that check failed to adjust the subsequent error path. That error path fails to drop a page reference in case the specified page is owned by a special system domain (DOM_IO and DOM_COW are system domains which can have memory pages assigned to them.)

Record
EUVD-2026-98832
CVSS 3.1
4.7 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-hwfh-h726-49f6 4.7

With its original introduction, GNTTAB_cache_flush was made available uniformly. XSA-232 (CVE...

With its original introduction, GNTTAB_cache_flush was made available uniformly. XSA-232 (CVE-2017-14318) then covered an omitted NULL pointer check, yet the addition of that check failed to adjust the subsequent error path. That error path fails to drop a page reference in case the specified page is owned by a special system domain (DOM_IO and DOM_COW are system domains which can have memory pages assigned to them.)

Record
GHSA-hwfh-h726-49f6
CVSS 3.1
4.7 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-404
Updated
2026-11-02
NVD 4.7

With its original introduction, GNTTAB_cache_flush was made available uniformly. XSA-232 (CVE-2017-14318) then covered an omitted NULL pointer check, yet the addition of that check failed to adjust the subsequent error path. That error path fails to drop a page reference in case the specified page is owned by a special system domain (DOM_IO and DOM_COW are system domains which can have memory pages assigned to them.)

Record
CVE-2026-102700
CVSS 3.1
4.7 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-404
Updated
2026-11-02
OSVALPINE-CVE-2026-102700 4.7

With its original introduction, GNTTAB_cache_flush was made available uniformly. XSA-232 (CVE-2017-14318) then covered an omitted NULL pointer check, yet the addition of that check failed to adjust the subsequent error path. That error path fails to drop a page reference in case the specified page is owned by a special system domain (DOM_IO and DOM_COW are system domains which can have memory pages assigned to them.)

Record
ALPINE-CVE-2026-102700
CVSS 3.1
4.7 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2026-102700 4.7

With its original introduction, GNTTAB_cache_flush was made available uniformly. XSA-232 (CVE-2017-14318) then covered an omitted NULL pointer check, yet the addition of that check failed to adjust the subsequent error path. That error path fails to drop a page reference in case the specified page is owned by a special system domain (DOM_IO and DOM_COW are system domains which can have memory pages assigned to them.)

Record
DEBIAN-CVE-2026-102700
CVSS 3.1
4.7 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-04
Show 5 moreShow less
OSVUBUNTU-CVE-2026-102700 4.7

With its original introduction, GNTTAB_cache_flush was made available uniformly. XSA-232 (CVE-2017-14318) then covered an omitted NULL pointer check, yet the addition of that check failed to adjust the subsequent error path. That error path fails to drop a page reference in case the specified page is owned by a special system domain (DOM_IO and DOM_COW are system domains which can have memory pages assigned to them.)

Record
UBUNTU-CVE-2026-102700
CVSS 3.1
4.7 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVSUSE-SU-2026:4641-1 No score

Security update for xen

This update for xen fixes the following issues:

Security issues fixed:

  • CVE-2026-79609: x86: XPTI may break on huge-memory systems (bsc#1283321).
  • CVE-2026-79610: grant-table: double version change race (bsc#1283322).
  • CVE-2026-79611: VMX: VMentry failure with branch tracing and blocked states (bsc#1283323).
  • CVE-2026-102700: gnttab: cache-flush handling may cause page reference leak (bsc#1283325).

Non security issue fixed:

  • Xen: Missing upstream bug fixes (bsc#1027519).
Record
SUSE-SU-2026:4641-1
Updated
2026-11-02
OSVSUSE-SU-2026:4642-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2026-79609: x86: XPTI may break on huge-memory systems (bsc#1283321).
  • CVE-2026-79610: grant-table: double version change race (bsc#1283322).
  • CVE-2026-79611: VMX: VMentry failure with branch tracing and blocked states (bsc#1283323).
  • CVE-2026-102700: gnttab: cache-flush handling may cause page reference leak (bsc#1283325).
Record
SUSE-SU-2026:4642-1
Updated
2026-11-02
OSVSUSE-SU-2026:4732-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2026-79609: x86: XPTI may break on huge-memory systems (bsc#1283321).
  • CVE-2026-79610: grant-table: double version change race (bsc#1283322).
  • CVE-2026-79611: VMX: VMentry failure with branch tracing and blocked states (bsc#1283323).
  • CVE-2026-102700: gnttab: cache-flush handling may cause page reference leak (bsc#1283325).
Record
SUSE-SU-2026:4732-1
Updated
2026-11-02
OSVSUSE-SU-2026:4942-1 No score

Security update for xen

This update for xen fixes the following issues:

  • CVE-2026-79608: x86/AMD: ineffectual Zenbleed workaround (bsc#1283317).
  • CVE-2026-79609: x86: XPTI may break on huge-memory systems (bsc#1283321).
  • CVE-2026-79610: grant-table: double version change race (bsc#1283322).
  • CVE-2026-79611: VMX: VMentry failure with branch tracing and blocked states (bsc#1283323).
  • CVE-2026-102700: gnttab: cache-flush handling may cause page reference leak (bsc#1283325).
Record
SUSE-SU-2026:4942-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
xen
Alpine:v3.21
 before 4.19.6-r2
4.19.6-r2
xen
Alpine:v3.22
 before 4.20.4-r2
4.20.4-r2
xen
Alpine:v3.23
 before 4.20.4-r2
4.20.4-r2
xen
Debian:12
 before 4.17.7+13-g2445b30a44-0+deb12u1, plus listed versions
4.17.1+2-gb773c48e36-14.17.2+55-g0b56bed864-14.17.2+76-ge1f9cb16e2-14.17.2+76-ge1f9cb16e2-1~deb12u14.17.2-1
Show 10 moreShow less
4.17.3+10-g091466ba55-14.17.3+10-g091466ba55-1.14.17.3+10-g091466ba55-1.1~exp14.17.3+10-g091466ba55-1.1~exp24.17.3+10-g091466ba55-1~deb12u14.17.3+36-g54dacb5c02-14.17.5+23-ga4e5191dc0-14.17.5+23-ga4e5191dc0-1+deb12u14.17.5+72-g01140da4e8-14.17.7-0+deb12u1
4.17.7+13-g2445b30a44-0+deb12u1
xen
Debian:13
 before 4.20.4+39-gf1e1321c87-0+deb13u1, plus listed versions
4.20.0+68-g35cb38b222-14.20.2+37-g61ff35323e-0+deb13u14.20.2+37-g61ff35323e-14.20.2+7-g1badcf5035-0+deb13u14.20.2+7-g1badcf5035-14.20.2+7-g1badcf5035-24.20.3+127-gc42374a105-0+deb13u14.20.3+127-gc42374a105-1
4.20.4+39-gf1e1321c87-0+deb13u1
xen
Debian:14
 before 4.20.4+39-gf1e1321c87-1, plus listed versions
4.20.0+68-g35cb38b222-14.20.2+37-g61ff35323e-14.20.2+7-g1badcf5035-14.20.2+7-g1badcf5035-24.20.3+127-gc42374a105-1
4.20.4+39-gf1e1321c87-1
xen
SUSE:Linux Enterprise Micro 5.5
 before 4.17.7_02-150500.3.82.1
4.17.7_02-150500.3.82.1
xen
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS
 before 4.17.7_02-150500.3.82.1
4.17.7_02-150500.3.82.1
xen
SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS
 before 4.17.7_02-150500.3.82.1
4.17.7_02-150500.3.82.1
xen
SUSE:Linux Enterprise Server 15 SP5-LTSS
 before 4.17.7_02-150500.3.82.1
4.17.7_02-150500.3.82.1
Show 18 moreShow less
Affected packages
PackageAffectedFixed
xen
SUSE:Linux Enterprise Server for SAP Applications 15 SP5
 before 4.17.7_02-150500.3.82.1
4.17.7_02-150500.3.82.1
xen
SUSE:Linux Enterprise Micro 5.3
 before 4.16.7_16-150400.4.95.1
4.16.7_16-150400.4.95.1
xen
SUSE:Linux Enterprise Micro 5.4
 before 4.16.7_16-150400.4.95.1
4.16.7_16-150400.4.95.1
xen
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS
 before 4.16.7_16-150400.4.95.1
4.16.7_16-150400.4.95.1
xen
SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS
 before 4.16.7_16-150400.4.95.1
4.16.7_16-150400.4.95.1
xen
SUSE:Linux Enterprise Server 15 SP4-LTSS
 before 4.16.7_16-150400.4.95.1
4.16.7_16-150400.4.95.1
xen
SUSE:Linux Enterprise Server for SAP Applications 15 SP4
 before 4.16.7_16-150400.4.95.1
4.16.7_16-150400.4.95.1
xen
SUSE:Linux Enterprise Server 12 SP5-LTSS
 before 4.12.4_76-3.154.1
4.12.4_76-3.154.1
xen
SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5
 before 4.12.4_76-3.154.1
4.12.4_76-3.154.1
xen
SUSE:Linux Enterprise Module for Basesystem 15 SP7
 before 4.20.4_06-150700.3.49.2
4.20.4_06-150700.3.49.2
xen
SUSE:Linux Enterprise Module for Server Applications 15 SP7
 before 4.20.4_06-150700.3.49.2
4.20.4_06-150700.3.49.2
xen
Ubuntu:16.04:LTS
 All versions, plus listed versions
4.5.1-0ubuntu14.5.1-0ubuntu24.6.0-1ubuntu14.6.0-1ubuntu24.6.0-1ubuntu4
Show 7 moreShow less
4.6.0-1ubuntu4.14.6.0-1ubuntu4.24.6.0-1ubuntu4.34.6.5-0ubuntu14.6.5-0ubuntu1.14.6.5-0ubuntu1.24.6.5-0ubuntu1.4
 None known
xen
Ubuntu:18.04:LTS
 All versions, plus listed versions
4.9.0-0ubuntu34.9.0-0ubuntu44.9.2-0ubuntu1
 None known
xen
Ubuntu:20.04:LTS
 All versions, plus listed versions
4.9.2-0ubuntu24.9.2-0ubuntu64.9.2-0ubuntu74.11.3+24-g14b62ab3e5-1ubuntu14.11.3+24-g14b62ab3e5-1ubuntu24.11.3+24-g14b62ab3e5-1ubuntu2.24.11.3+24-g14b62ab3e5-1ubuntu2.3
 None known
xen
Ubuntu:22.04:LTS
 All versions, plus listed versions
4.11.4+24-gddaaccbbab-1ubuntu24.16.0-1~ubuntu24.16.0-1~ubuntu2.1
 None known
xen
Ubuntu:24.04:LTS
 All versions, plus listed versions
4.17.2-14.17.2+55-g0b56bed864-14.17.2+76-ge1f9cb16e2-14.17.2+76-ge1f9cb16e2-1ubuntu14.17.3+10-g091466ba55-14.17.3+10-g091466ba55-1.1ubuntu24.17.3+10-g091466ba55-1.1ubuntu3
 None known
xen
Ubuntu:26.10
 All versions, plus listed versions
4.20.2+7-g1badcf5035-2build24.20.2+37-g61ff35323e-1ubuntu14.20.3+127-gc42374a105-1
 None known
xen
Ubuntu:26.04:LTS
 All versions, plus listed versions
4.20.0+68-g35cb38b222-14.20.2+7-g1badcf5035-24.20.2+7-g1badcf5035-2build2
 None known

History

History
RecordedChangedSources
affected, factsOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-102700 is a medium vulnerability (CVSS 4.7) in Xen, published October 13, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.15%, the 4th percentile. Fixed in xen 4.19.6-r2.

References

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