Linux · SUSE Linux Enterprise · Security advisory · September 8, 2026

SUSE-SU-2026:4090-1: xen security update

SUSE-SU-2026:4090-1, released September 8, 2026, fixes 18 CVEs in xen (version 4.20.4_04-150700.3.46.1). None of them is reported as exploited. Patch Radar priority: High.

High

CVEs closed

None rated Critical

Exploited

None reported

Highest CVSS

8.8

Base score, 0 to 10

Highest EPSS

0.0045

39th percentile

Priority of the 18 CVEs

Patch now 0
                                Urgent 0
                                High 9
                                Routine 9

Fixed package versions

Product	Release	Fixed in
xen	sles 15.7	4.20.4_04-150700.3.46.1

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
High	CVE-2026-42493	xen: Addressing certain issues, in particular related to operations which may take excessively long and therefore would ne...	7.5	0.0045	None reported
High	CVE-2026-62431	xen: The logic to handle periodic Viridian STIMERs performs a division with an unchecked user-controlled divisor value, th...	7.5	0.0036	None reported
High	CVE-2026-62433	xen: Parts of the DM_OP handling code assumes the caller has provided the required number of buffers for the given operati...	7.3	0.0025	None reported
High	CVE-2026-62432	xen: The EVTCHNOP_expand_array hypercall checks for whether FIFO event channels are enabled, but without holding the corre...	7.3	0.0025	None reported
High	CVE-2026-62430	xen: Accesses to the CMOS memory contents are done using an indirect IO port pair	7.5	0.0024	None reported
High	CVE-2026-62427	xen: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to...	8.8	0.0024	None reported
High	CVE-2026-62426	xen: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to...	8.8	0.0022	None reported
High	CVE-2026-79602	xen: A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a BUG() in Xen.	8.8	0.0013	None reported
High	CVE-2026-62428	xen: When grant-copy operations are processed, the respective grant may or may not already be in use by another operation...	7.8	0.0012	None reported
Routine	CVE-2026-62434	xen: A guest started with Populated on Demand enabled (PoD) can attempt to reclaim pages which aren't regular guest RAM	5.3	0.0038	None reported
Routine	CVE-2026-62429	xen: Accessing the vNUMA configuration data of a guest is still possible when domain destruction has already started	6.5	0.0022	None reported
Routine	CVE-2026-79603	xen: x86 PV guests can free memory pages while still keeping a stale TLB entry pointing to them	4.3	0.0022	None reported
Routine	CVE-2026-42495	xen: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to...	5.5	0.0020	None reported
Routine	CVE-2026-62423	xen: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to...	5.5	0.0020	None reported
Routine	CVE-2026-62424	xen: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to...	5.5	0.0020	None reported
Routine	CVE-2026-62425	xen: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to...	5.5	0.0020	None reported
Routine	CVE-2026-42494	xen: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to...	6.1	0.0011	None reported
Routine	CVE-2026-62437	xen: When guests are terminated, various pieces of cleanup need carrying out	6.5	0.0010	None reported

Also fixes CVE-2026-42493

SUSE-SU-2026:3409-1
xen on sles 15.6
DEBIAN-CVE-2026-42493
xen on Debian 12.15 (bookworm), Debian 13.5 (trixie), Debian 14

Vendor advisory

https://osv.dev/vulnerability/SUSE-SU-2026:4090-1

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