CVE-2026-63938
linux: In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Check PSC request indices against the...
CVE-2026-63938 is fixed in 88 products on 1 platform, first by ALAS2023-2026-1881, released June 22, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
Urgent
CVSS
9.3
critical
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0020
9th percentile
In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Check PSC request indices against the actual size of the buffer When processing Page State Change (PSC) requests, validate the PSC buffer against the effective size of the scratch area, which could be less than the maximum size if the guest provided a pointer that isn't exactly at the start of the GHCB shared buffer.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| bpftool6.12 · amzn 2023 | 1:6.12.94-123.174.amzn2023 | ALAS2023-2026-1968 | Jul 20, 2026 |
| bpftool6.12-debuginfo · amzn 2023 | 1:6.12.94-123.174.amzn2023 | ALAS2023-2026-1968 | Jul 20, 2026 |
| bpftool6.18 · amzn 2023 | 1:6.18.35-68.127.amzn2023 | ALAS2023-2026-1881 | Jun 22, 2026 |
| bpftool6.18-debuginfo · amzn 2023 | 1:6.18.35-68.127.amzn2023 | ALAS2023-2026-1881 | Jun 22, 2026 |
| dtb-aarch64 · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-64kb · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-64kb · sles 15.7 | 6.4.0-150700.53.78.1 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-64kb · sles 16.0 | 6.12.0-160000.37.1 | SUSE-SU-2026:23231-1 | Aug 11, 2026 |
| kernel-azure · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-azure · sles 15.7 | 6.4.0-150700.53.78.1 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-azure · sles 16.0 | 6.12.0-160000.37.1 | SUSE-SU-2026:23231-1 | Aug 11, 2026 |
| kernel-default · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-default · sles 15.7 | 6.4.0-150700.53.78.1 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-default · sles 16.0 | 6.12.0-160000.37.1 | SUSE-SU-2026:23237-1 | Aug 11, 2026 |
| kernel-default-base · opensuse-leap 16.0 | 6.12.0-160000.37.1.160000.2.19 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-default-base · sles 15.7 | 6.4.0-150700.53.78.1.150700.17.43.2 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-default-base · sles 16.0 | 6.12.0-160000.37.1.160000.2.19 | SUSE-SU-2026:23231-1 | Aug 11, 2026 |
| kernel-docs · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-docs · sles 15.7 | 6.4.0-150700.53.78.1 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-docs · sles 16.0 | 6.12.0-160000.37.1 | SUSE-SU-2026:23231-1 | Aug 11, 2026 |
| kernel-kvmsmall · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-kvmsmall · sles 16.0 | 6.12.0-160000.37.1 | SUSE-SU-2026:23231-1 | Aug 11, 2026 |
| kernel-livepatch-6.12.94-123.174 · amzn 2023 | 1:1.0-0.amzn2023 | ALAS2023-2026-1968 | Jul 20, 2026 |
| kernel-livepatch-6.18.35-68.127 · amzn 2023 | 1:1.0-0.amzn2023 | ALAS2023-2026-1881 | Jun 22, 2026 |
| kernel-livepatch-SLE15-SP7-RT_Update_19 · sles 15.7 | 1-150700.1.5.1 | SUSE-SU-2026:3810-1 | Aug 26, 2026 |
| kernel-livepatch-SLE15-SP7_Update_20 · sles 15.7 | 1-150700.15.3.2 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-obs-build · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-obs-build · sles 15.7 | 6.4.0-150700.53.78.1 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-obs-qa · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-obs-qa · sles 16.0 | 6.12.0-160000.37.1 | SUSE-SU-2026:23231-1 | Aug 11, 2026 |
| kernel-rt · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-source · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-source · sles 15.7 | 6.4.0-150700.53.78.1 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-source · sles 16.0 | 6.12.0-160000.37.1 | SUSE-SU-2026:23231-1 | Aug 11, 2026 |
| kernel-syms · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-syms · sles 15.7 | 6.4.0-150700.53.78.1 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-syms · sles 16.0 | 6.12.0-160000.37.1 | SUSE-SU-2026:23231-1 | Aug 11, 2026 |
| kernel-uek · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-core · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-core · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-core · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-core · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-devel · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-devel · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-modules · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-modules · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-modules-core · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-modules-core · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-modules-deprecated · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-modules-deprecated · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-modules-desktop · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-modules-desktop · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-modules-extra · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-modules-extra · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-modules-extra-netfilter · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-modules-extra-netfilter · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-modules-usb · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-modules-usb · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-modules-wireless · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-debug-modules-wireless · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-devel · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-devel · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-doc · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-doc · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-modules · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-modules · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-modules-core · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-modules-core · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-modules-deprecated · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-modules-deprecated · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-modules-desktop · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-modules-desktop · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-modules-extra · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-modules-extra · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-modules-extra-netfilter · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-modules-extra-netfilter · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-modules-usb · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-modules-usb · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-modules-wireless · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-modules-wireless · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-tools · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek-tools · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-core · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-core · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-devel · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-devel · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-modules · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-modules · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-modules-core · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-modules-core · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-modules-deprecated · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-modules-deprecated · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-modules-desktop · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-modules-desktop · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-modules-extra · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-modules-extra · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-modules-extra-netfilter · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-modules-extra-netfilter · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-modules-usb · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-modules-usb · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-modules-wireless · ol 10 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-uek64k-modules-wireless · ol 9 | 0:6.12.0-206.104.3.3.el9uek | ELSA-2026-500248 | Sep 4, 2026 |
| kernel-zfcpdump · opensuse-leap 16.0 | 6.12.0-160000.37.1 | OPENSUSE-SU-2026:21555-1 | Aug 12, 2026 |
| kernel-zfcpdump · sles 15.7 | 6.4.0-150700.53.78.1 | SUSE-SU-2026:3790-1 | Aug 25, 2026 |
| kernel-zfcpdump · sles 16.0 | 6.12.0-160000.37.1 | SUSE-SU-2026:23231-1 | Aug 11, 2026 |
| kernel6.12 · amzn 2023 | 1:6.12.94-123.174.amzn2023 | ALAS2023-2026-1968 | Jul 20, 2026 |
| kernel6.12-debuginfo · amzn 2023 | 1:6.12.94-123.174.amzn2023 | ALAS2023-2026-1968 | Jul 20, 2026 |
| kernel6.12-debuginfo-common-aarch64 · amzn 2023 | 1:6.12.94-123.174.amzn2023 | ALAS2023-2026-1968 | Jul 20, 2026 |
| kernel6.12-debuginfo-common-x86_64 · amzn 2023 | 1:6.12.94-123.174.amzn2023 | ALAS2023-2026-1968 | Jul 20, 2026 |
| kernel6.12-devel · amzn 2023 | 1:6.12.94-123.174.amzn2023 | ALAS2023-2026-1968 | Jul 20, 2026 |
| kernel6.12-headers · amzn 2023 | 1:6.12.94-123.174.amzn2023 | ALAS2023-2026-1968 | Jul 20, 2026 |
| kernel6.12-modules-extra · amzn 2023 | 1:6.12.94-123.174.amzn2023 | ALAS2023-2026-1968 | Jul 20, 2026 |
| kernel6.12-modules-extra-common · amzn 2023 | 1:6.12.94-123.174.amzn2023 | ALAS2023-2026-1968 | Jul 20, 2026 |
| kernel6.12-tools · amzn 2023 | 1:6.12.94-123.174.amzn2023 | ALAS2023-2026-1968 | Jul 20, 2026 |
| kernel6.12-tools-debuginfo · amzn 2023 | 1:6.12.94-123.174.amzn2023 | ALAS2023-2026-1968 | Jul 20, 2026 |
| kernel6.12-tools-devel · amzn 2023 | 1:6.12.94-123.174.amzn2023 | ALAS2023-2026-1968 | Jul 20, 2026 |
| kernel6.18 · amzn 2023 | 1:6.18.35-68.127.amzn2023 | ALAS2023-2026-1881 | Jun 22, 2026 |
| kernel6.18-debuginfo · amzn 2023 | 1:6.18.35-68.127.amzn2023 | ALAS2023-2026-1881 | Jun 22, 2026 |
| kernel6.18-debuginfo-common-aarch64 · amzn 2023 | 1:6.18.35-68.127.amzn2023 | ALAS2023-2026-1881 | Jun 22, 2026 |
| kernel6.18-debuginfo-common-x86_64 · amzn 2023 | 1:6.18.35-68.127.amzn2023 | ALAS2023-2026-1881 | Jun 22, 2026 |
| kernel6.18-devel · amzn 2023 | 1:6.18.35-68.127.amzn2023 | ALAS2023-2026-1881 | Jun 22, 2026 |
| kernel6.18-headers · amzn 2023 | 1:6.18.35-68.127.amzn2023 | ALAS2023-2026-1881 | Jun 22, 2026 |
| kernel6.18-modules-extra · amzn 2023 | 1:6.18.35-68.127.amzn2023 | ALAS2023-2026-1881 | Jun 22, 2026 |
| kernel6.18-modules-extra-common · amzn 2023 | 1:6.18.35-68.127.amzn2023 | ALAS2023-2026-1881 | Jun 22, 2026 |
| kernel6.18-tools · amzn 2023 | 1:6.18.35-68.127.amzn2023 | ALAS2023-2026-1881 | Jun 22, 2026 |
| kernel6.18-tools-debuginfo · amzn 2023 | 1:6.18.35-68.127.amzn2023 | ALAS2023-2026-1881 | Jun 22, 2026 |
| kernel6.18-tools-devel · amzn 2023 | 1:6.18.35-68.127.amzn2023 | ALAS2023-2026-1881 | Jun 22, 2026 |
| linux · Debian 13.5 (trixie) | 6.12.94-1 | DEBIAN-CVE-2026-63938 | Jul 20, 2026 |
| linux · Debian 14 | 7.0.12-1 | DEBIAN-CVE-2026-63938 | Jul 20, 2026 |
| microvm-kernel6.18 · amzn 2023 | 1:6.18.35-68.127.amzn2023 | ALAS2023-2026-1881 | Jun 22, 2026 |
| perf6.12 · amzn 2023 | 1:6.12.94-123.174.amzn2023 | ALAS2023-2026-1968 | Jul 20, 2026 |
| perf6.12-debuginfo · amzn 2023 | 1:6.12.94-123.174.amzn2023 | ALAS2023-2026-1968 | Jul 20, 2026 |
| perf6.18 · amzn 2023 | 1:6.18.35-68.127.amzn2023 | ALAS2023-2026-1881 | Jun 22, 2026 |
| perf6.18-debuginfo · amzn 2023 | 1:6.18.35-68.127.amzn2023 | ALAS2023-2026-1881 | Jun 22, 2026 |
| python3-perf6.12 · amzn 2023 | 1:6.12.94-123.174.amzn2023 | ALAS2023-2026-1968 | Jul 20, 2026 |
| python3-perf6.12-debuginfo · amzn 2023 | 1:6.12.94-123.174.amzn2023 | ALAS2023-2026-1968 | Jul 20, 2026 |
| python3-perf6.18 · amzn 2023 | 1:6.18.35-68.127.amzn2023 | ALAS2023-2026-1881 | Jun 22, 2026 |
| python3-perf6.18-debuginfo · amzn 2023 | 1:6.18.35-68.127.amzn2023 | ALAS2023-2026-1881 | Jun 22, 2026 |
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