Description
The make_response function in drivers/block/xen-blkback/blkback.c in the Linux kernel before 4.11.8 allows guest OS users to obtain sensitive information from host OS (or other guest OS) kernel memory by leveraging the copying of uninitialized padding fields in Xen block-interface response structures, aka XSA-216.
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 | linux | 4.11.11-1 | — |
| Debian 14 | qemu | 1:2.8+dfsg-7 | — |
| Debian 13 | linux | 4.11.11-1 | — |
| Debian 13 | qemu | 1:2.8+dfsg-7 | — |
| Debian 12 | linux | 4.11.11-1 | — |
| Debian 12 | qemu | 1:2.8+dfsg-7 | — |
| Debian 9 | linux | 4.9.30-2+deb9u3 | DSA-3927-1 |
| Debian 9 | qemu | 1:2.8+dfsg-6+deb9u1 | DSA-3920-1 |
| Debian 8 | linux | 3.16.43-2+deb8u3 | DSA-3945-1 |
| Debian 8 | qemu | 1:2.1+dfsg-12+deb8u7 | DLA-1497-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | linux | 3.2.93-1 | DLA-1099-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-gcp-6.11 +4 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-realtime +1 | No fix yet | — |
| Ubuntu 16.04 LTS | linux | 4.4.0-98.121 | USN-3469-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1039.48 | USN-3469-1 |
| Ubuntu 16.04 LTS | linux-gcp | 4.10.0-1008.8 | USN-3468-3 |
| Ubuntu 16.04 LTS | linux-gke | 4.4.0-1033.33 | USN-3469-1 |
| Ubuntu 16.04 LTS | linux-hwe | 4.13.0-32.35~16.04.1 | USN-3468-2 |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1009.14 | USN-3469-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1076.84 | USN-3469-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1078.83 | USN-3469-1 |
| Ubuntu 16.04 LTS | qemu | 1:2.5+dfsg-5ubuntu10.15 | USN-3414-1 |
| Ubuntu 14.04 LTS | linux | 3.13.0-135.184 | USN-3470-1 |
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-98.121~14.04.1 | USN-3469-2 |
| Ubuntu 14.04 LTS | qemu | 2.0.0+dfsg-2ubuntu1.35 | USN-3414-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | linux-azure-fde-5.15 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | qemu | 2.9.1-6.6.3 | SUSE-SU-2017:2924-1 |
| SLES 12 SP2 | qemu | 2.6.2-41.22.2 | SUSE-SU-2017:2936-1 |
| SLES 12 SP1 | qemu | 2.3.1-33.3.3 | SUSE-SU-2017:2946-1 |
| SLES 12 SP1 | xen | 4.5.5_12-22.18.1 | SUSE-SU-2017:1812-1 |
| SLES 12 | xen | 4.4.4_21-22.42.1 | SUSE-SU-2017:1795-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | qemu | 2.9.1-6.6.3 | SUSE-SU-2017:2924-1 |
| SLES for SAP 12 SP2 | qemu | 2.6.2-41.22.2 | SUSE-SU-2017:2936-1 |
| SLES for SAP 12 SP1 | qemu | 2.3.1-33.3.3 | SUSE-SU-2017:2946-1 |
| SLES for SAP 12 SP1 | xen | 4.5.5_12-22.18.1 | SUSE-SU-2017:1812-1 |
| SLES for SAP 12 | xen | 4.4.4_21-22.42.1 | SUSE-SU-2017:1795-1 |
| SUSE OpenStack Cloud 6 | qemu | 2.3.1-33.3.3 | SUSE-SU-2017:2946-1 |
| SUSE OpenStack Cloud 6 | xen | 4.5.5_12-22.18.1 | SUSE-SU-2017:1812-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xen | 4.9.0-r0 | — |
| Alpine v3.23 | xen | 4.9.0-r0 | — |
| Alpine v3.22 | xen | 4.9.0-r0 | — |
| Alpine v3.21 | xen | 4.9.0-r0 | — |
| Alpine v3.20 | xen | 4.9.0-r0 | — |
Show 17 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | xen | 4.9.0-r0 | — |
| Alpine v3.18 | xen | 4.9.0-r0 | — |
| Alpine v3.17 | xen | 4.9.0-r0 | — |
| Alpine v3.16 | xen | 4.9.0-r0 | — |
| Alpine v3.15 | xen | 4.9.0-r0 | — |
| Alpine v3.14 | xen | 4.9.0-r0 | — |
| Alpine v3.13 | xen | 4.9.0-r0 | — |
| Alpine v3.12 | xen | 4.9.0-r0 | — |
| Alpine v3.11 | xen | 4.9.0-r0 | — |
| Alpine v3.10 | xen | 4.9.0-r0 | — |
| Alpine v3.9 | xen | 4.9.0-r0 | — |
| Alpine v3.8 | xen | 4.9.0-r0 | — |
| Alpine v3.7 | xen | 4.9.0-r0 | — |
| Alpine v3.6 | xen | 4.8.2-r0 | — |
| Alpine v3.5 | xen | 4.7.3-r0 | — |
| Alpine v3.4 | xen | 4.6.6-r0 | — |
| Alpine v3.3 | xen | 4.6.6-r0 | — |
Advisories 16
- USN-3470-1 linux vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3469-1 linux, linux-aws, linux-gke, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3920-1 qemu - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1497-1 qemu - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3945-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3927-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1099-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3469-2 linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-3468-3 linux-gcp vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-3468-2 linux-hwe vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-3414-1 qemu vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2017:2924-1 Security update for qemu SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1795-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1812-1 Security update for xen SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2936-1 Security update for qemu SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2017:2946-1 Security update for qemu SUSE / openSUSE Security Updates · May 2, 2025
References
- https://xenbits.xen.org/xsa/advisory-216.html
- DSA-3927 vendor-advisory
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=089bc0143f489bd3a4578bdff5f4ca68fb26f341
- DSA-3920 vendor-advisory
- [debian-lts-announce] 20180906 [SECURITY] [DLA 1497-1] qemu security update mailing-list
- GLSA-201708-03 vendor-advisory
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.11.8
- 99162 vdb-entry
- 1038720 vdb-entry
- https://github.com/torvalds/linux/commit/089bc0143f489bd3a4578bdff5f4ca68fb26f341
- DSA-3945 vendor-advisory