Description
An issue was discovered in xenvif_set_hash_mapping in drivers/net/xen-netback/hash.c in the Linux kernel through 4.18.1, as used in Xen through 4.11.x and other products. The Linux netback driver allows frontends to control mapping of requests to request queues. When processing a request to set or change this mapping, some input validation (e.g., for an integer overflow) was missing or flawed, leading to OOB access in hash handling. A malicious or buggy frontend may cause the (usually privileged) backend to make out of bounds memory accesses, potentially resulting in one or more of privilege escalation, Denial of Service (DoS), or information leaks.
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 | 4.18.10-2 | — |
| Debian 13 | linux | 4.18.10-2 | — |
| Debian 12 | linux | 4.18.10-2 | — |
| Debian 9 | linux | 4.9.110-3+deb9u6 | DSA-4313-1 |
| Debian 8 | linux-4.9 | 4.9.144-3.1~deb8u1 | DLA-1715-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | linux | 4.15.0-39.42 | USN-3820-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1027.27 | USN-3820-1 |
| Ubuntu 18.04 LTS | linux-azure | 4.15.0-1031.32 | USN-3820-1 |
| Ubuntu 18.04 LTS | linux-gcp | 4.15.0-1024.25 | USN-3820-1 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1026.26 | USN-3820-1 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1026.31 | USN-3820-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1028.30 | USN-3820-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1031.32~16.04.1 | USN-3820-2 |
| Ubuntu 16.04 LTS | linux-azure-edge | 4.18.0-1006.6~16.04.2 | — |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1024.25~16.04.2 | USN-3820-2 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-39.42~16.04.1 | USN-3820-2 |
| Ubuntu 14.04 LTS | linux-azure | 4.15.0-1031.32~14.04.1 | USN-3820-3 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_0 | 3-7.3 | SUSE-SU-2018:2677-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_1 +1 | 3-2.1 | SUSE-SU-2018:2678-1, SUSE-SU-2018:2677-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_3 | 2-2.2 | SUSE-SU-2018:2935-1, SUSE-SU-2018:2933-1 |
Advisories 9
- USN-3820-1 linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oem, linux-raspi2 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4313-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1715-1 linux-4.9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3820-2 linux-hwe, linux-azure, linux-gcp vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-3820-3 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2018:2935-1 Security update for the Linux Kernel (Live Patch 3 for SLE 15) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2678-1 Security update for the Linux Kernel (Live Patch 2 for SLE 15) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2933-1 Security update for the Linux Kernel (Live Patch 3 for SLE 15) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2677-1 Security update for the Linux Kernel (Live Patch 0 for SLE 15) SUSE / openSUSE Security Updates · Feb 4, 2026
References
- USN-3820-1 vendor-advisory
- http://xenbits.xen.org/xsa/advisory-270.html
- USN-3820-2 vendor-advisory
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1607
- DSA-4313 vendor-advisory
- [debian-lts-announce] 20190315 [SECURITY] [DLA 1715-1] linux-4.9 security update mailing-list
- USN-3819-1 vendor-advisory
- USN-3820-3 vendor-advisory