Description
insufficient TLB flush for x86 PV guests in shadow mode For migration as well as to work around kernels unaware of L1TF (see XSA-273), PV guests may be run in shadow paging mode. To address XSA-401, code was moved inside a function in Xen. This code movement missed a variable changing meaning / value between old and new code positions. The now wrong use of the variable did lead to a wrong TLB flush condition, omitting flushes where such are necessary.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Xen | xen | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | xen | 4.16.2-1 | — |
| Debian 13 | xen | 4.16.2-1 | — |
| Debian 12 | xen | 4.16.2-1 | — |
| Debian 11 | xen | 4.14.5+86-g1c354767d5-1 | DSA-5272-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | xen | No fix yet | — |
| Ubuntu 26.04 LTS | xen | No fix yet | — |
| Ubuntu 25.10 | xen | No fix yet | — |
| Ubuntu 24.04 LTS | xen | No fix yet | — |
| Ubuntu 22.04 LTS | xen | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | xen | No fix yet | — |
| Ubuntu 18.04 LTS | xen | No fix yet | — |
| Ubuntu 16.04 LTS | xen | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | xen | 4.16.1_06-150400.4.8.1 | SUSE-SU-2022:2597-1 |
| SLES 15 SP3 | xen | 4.14.5_04-150300.3.32.1 | SUSE-SU-2022:3665-1, SUSE-SU-2022:2599-1 |
| SLES 15 SP2 | xen | 4.13.4_12-150200.3.58.1 | SUSE-SU-2022:2591-1 |
| SLES 15 SP1 | xen | 4.12.4_26-150100.3.75.1 | SUSE-SU-2022:2600-1 |
| SLES 12 SP5 | xen | 4.12.4_26-3.74.1 | SUSE-SU-2022:2557-1 |
Show 20 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP4 | xen | 4.11.4_30-2.76.1 | SUSE-SU-2022:2560-1 |
| SLES 12 SP3 | xen | 4.9.4_30-3.106.1 | SUSE-SU-2022:2574-1 |
| SLES 12 SP2 | xen | 4.7.6_24-43.91.1 | SUSE-SU-2022:2569-1 |
| SLES for SAP 15 SP2 | xen | 4.13.4_12-150200.3.58.1 | SUSE-SU-2022:2591-1 |
| SLES for SAP 15 SP1 | xen | 4.12.4_26-150100.3.75.1 | SUSE-SU-2022:2600-1 |
| SLES for SAP 15 | xen | 4.10.4_36-150000.3.77.1 | SUSE-SU-2022:2601-1 |
| SLES for SAP 12 SP5 | xen | 4.12.4_26-3.74.1 | SUSE-SU-2022:2557-1 |
| SLES for SAP 12 SP4 | xen | 4.11.4_30-2.76.1 | SUSE-SU-2022:2560-1 |
| SLE Micro 5.2 | xen | 4.14.5_04-150300.3.32.1 | SUSE-SU-2022:3665-1, SUSE-SU-2022:2599-1 |
| SLE Micro 5.1 | xen | 4.14.5_04-150300.3.32.1 | SUSE-SU-2022:3665-1, SUSE-SU-2022:2599-1 |
| SLE HPC 15 SP2 | xen | 4.13.4_12-150200.3.58.1 | SUSE-SU-2022:2591-1 |
| SLE HPC 15 SP1 | xen | 4.12.4_26-150100.3.75.1 | SUSE-SU-2022:2600-1 |
| SLE HPC 15 | xen | 4.10.4_36-150000.3.77.1 | SUSE-SU-2022:2601-1 |
| SUSE OpenStack Cloud Crowbar 9 | xen | 4.11.4_30-2.76.1 | SUSE-SU-2022:2560-1 |
| SUSE OpenStack Cloud 9 | xen | 4.11.4_30-2.76.1 | SUSE-SU-2022:2560-1 |
| SUSE Manager Server 4.1 | xen | 4.13.4_12-150200.3.58.1 | SUSE-SU-2022:2591-1 |
| SUSE Manager Retail Branch Server 4.1 | xen | 4.13.4_12-150200.3.58.1 | SUSE-SU-2022:2591-1 |
| SUSE Manager Proxy 4.1 | xen | 4.13.4_12-150200.3.58.1 | SUSE-SU-2022:2591-1 |
| SUSE Enterprise Storage 7 | xen | 4.13.4_12-150200.3.58.1 | SUSE-SU-2022:2591-1 |
| SUSE Enterprise Storage 6 | xen | 4.12.4_26-150100.3.75.1 | SUSE-SU-2022:2600-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | xen | 4.16.1_02-3.1 | openSUSE-SU-2024:12219-1 |
| openSUSE Leap 15.4 | xen | 4.16.1_06-150400.4.8.1 | SUSE-SU-2022:2597-1 |
| openSUSE Leap 15.3 | xen | 4.14.5_04-150300.3.32.1 | SUSE-SU-2022:3665-1, SUSE-SU-2022:2599-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.2 | xen | 4.14.5_04-150300.3.32.1 | SUSE-SU-2022:3665-1, SUSE-SU-2022:2599-2 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xen | 4.16.1-r6 | — |
| Alpine v3.23 | xen | 4.16.1-r6 | — |
| Alpine v3.22 | xen | 4.16.1-r6 | — |
| Alpine v3.21 | xen | 4.16.1-r6 | — |
| Alpine v3.20 | xen | 4.16.1-r6 | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | xen | 4.16.1-r6 | — |
| Alpine v3.18 | xen | 4.16.1-r6 | — |
| Alpine v3.17 | xen | 4.16.1-r6 | — |
| Alpine v3.15 | xen | 4.15.3-r2 | — |
| Alpine v3.14 | xen | 4.15.3-r2 | — |
| Alpine v3.13 | xen | 4.14.5-r5 | — |
Advisories 13
- DSA-5272-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2022:2599-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2560-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2600-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2591-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2574-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2569-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:3665-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2599-2 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2597-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2601-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12219-1 xen-4.16.1_02-3.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2557-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://xenbits.xenproject.org/xsa/advisory-408.txt
- http://xenbits.xen.org/xsa/advisory-408.html
- [oss-security] 20220726 Xen Security Advisory 408 v2 (CVE-2022-33745) - insufficient TLB flush for x86 PV guests in shadow mode mailing-list
- [oss-security] 20220726 Xen Security Advisory 408 v3 (CVE-2022-33745) - insufficient TLB flush for x86 PV guests in shadow mode mailing-list
- FEDORA-2022-4f7cd241e2 vendor-advisory
- FEDORA-2022-a0d7a5eaf2 vendor-advisory
- DSA-5272 vendor-advisory