Description
Guest can force Linux netback driver to hog large amounts of kernel memory T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Incoming data packets for a guest in the Linux kernel's netback driver are buffered until the guest is ready to process them. There are some measures taken for avoiding to pile up too much data, but those can be bypassed by the guest: There is a timeout how long the client side of an interface can stop consuming new packets before it is assumed to have stalled, but this timeout is rather long (60 seconds by default). Using a UDP connection on a fast interface can easily accumulate gigabytes of data in that time. (CVE-2021-28715) The timeout could even never trigger if the guest manages to have only one free slot in its RX queue ring page and the next package would require more than one free slot, which may be the case when using GSO, XDP, or software hashing. (CVE-2021-28714)
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | — | — |
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 | 5.15.15-1 | — |
| Debian 13 | linux | 5.15.15-1 | — |
| Debian 12 | linux | 5.15.15-1 | — |
| Debian 11 | linux | 5.10.92-1 | DSA-5050-1 |
| Debian 10 | linux | 4.19.232-1 | DSA-5096-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 9 | linux | 4.9.303-1 | DLA-2940-1 |
| Debian 9 | linux-4.19 | 4.19.232-1~deb9u1 | DLA-2941-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-realtime +1 | No fix yet | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-105.119 | USN-5338-1 |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1069.73 | USN-5338-1 |
| Ubuntu 20.04 LTS | linux-aws-5.13 | 5.13.0-1019.21~20.04.1 | USN-5337-1 |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1073.76 | USN-5338-1 |
| Ubuntu 20.04 LTS | linux-azure-5.13 | 5.13.0-1021.24~20.04.1 | USN-5368-1 |
| Ubuntu 20.04 LTS | linux-azure-fde | 5.4.0-1073.76+cvm1.1 | USN-5338-1 |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1032.35 | USN-5377-1 |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1068.72 | USN-5338-1 |
| Ubuntu 20.04 LTS | linux-gcp-5.13 | 5.13.0-1021.25~20.04.1 | USN-5337-1 |
| Ubuntu 20.04 LTS | linux-gke | 5.4.0-1066.69 | USN-5338-1 |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1037.38 | USN-5338-1 |
| Ubuntu 20.04 LTS | linux-hwe-5.13 | 5.13.0-37.42~20.04.1 | USN-5337-1 |
| Ubuntu 20.04 LTS | linux-ibm | 5.4.0-1018.20 | USN-5338-1 |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1059.62 | USN-5338-1 |
| Ubuntu 20.04 LTS | linux-oem-5.14 | 5.14.0-1022.24 | USN-5278-1 |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1067.72 | USN-5338-1 |
| Ubuntu 20.04 LTS | linux-oracle-5.13 | 5.13.0-1025.30~20.04.1 | USN-5368-1 |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1056.63 | USN-5338-1 |
| Ubuntu 20.04 LTS | linux-riscv +17 | No fix yet | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-169.177 | USN-5298-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1121.129 | USN-5298-1 |
| Ubuntu 18.04 LTS | linux-aws-5.4 | 5.4.0-1069.73~18.04.1 | USN-5338-1 |
| Ubuntu 18.04 LTS | linux-azure-4.15 | 4.15.0-1131.144 | USN-5298-1 |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1073.76~18.04.1 | USN-5338-1 |
| Ubuntu 18.04 LTS | linux-dell300x | 4.15.0-1035.40 | USN-5298-1 |
| Ubuntu 18.04 LTS | linux-gcp +12 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1116.130 | USN-5298-1 |
| Ubuntu 18.04 LTS | linux-gcp-5.4 | 5.4.0-1068.72~18.04.1 | USN-5338-1 |
| Ubuntu 18.04 LTS | linux-gke-5.4 | 5.4.0-1066.69~18.04.1 | USN-5338-1 |
| Ubuntu 18.04 LTS | linux-gkeop-5.4 | 5.4.0-1037.38~18.04.1 | USN-5338-1 |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-105.119~18.04.1 | USN-5338-1 |
| Ubuntu 18.04 LTS | linux-ibm-5.4 | 5.4.0-1018.20~18.04.1 | USN-5338-1 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1107.109 | USN-5298-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1087.95 | USN-5298-1 |
| Ubuntu 18.04 LTS | linux-oracle-5.4 | 5.4.0-1067.72~18.04.1 | USN-5338-1 |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1056.63~18.04.1 | USN-5338-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1103.110 | USN-5298-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1120.129 | USN-5298-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 18.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-aws-fips | 5.4.0-1069.73+fips2 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1073.76+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips | 5.4.0-1046.52 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1067.71~20.04.1 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2061.63 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2043.47 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1078.87 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-gcp-fips | 4.15.0-2026.28 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1131.138 | USN-8966-1 |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-290.324 | USN-8966-1 |
| Ubuntu Pro 16.04 LTS | linux-aws | 4.4.0-1199.214 | — |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1120.128~16.04.1 | USN-5298-1 |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1131.144~16.04.1 | USN-5298-1 |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1116.130~16.04.1 | USN-5298-1 |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-169.177~16.04.1 | USN-5298-1 |
| Ubuntu Pro 16.04 LTS | linux-kvm | 4.4.0-1162.173 | USN-8966-1 |
| Ubuntu Pro 16.04 LTS | linux-oracle | 4.15.0-1087.95~16.04.1 | USN-5298-1 |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1161.167 | USN-8966-1 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1131.144~14.04.1 | USN-5298-1 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-290.324~14.04.1 | USN-8966-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | kernel-64kb +7 | 5.3.18-59.40.1 | SUSE-SU-2022:0131-1 |
| SLES 15 SP3 | kernel-azure +2 | 5.3.18-38.34.1 | SUSE-SU-2022:0056-1 |
| SLES 15 SP3 | kernel-default-base | 5.3.18-59.40.1.18.25.1 | SUSE-SU-2022:0131-1 |
| SLES 15 SP2 | kernel-default-base | 5.3.18-24.99.1.9.46.1 | SUSE-SU-2022:0197-1 |
| SLES 15 SP2 | kernel-docs +5 | 5.3.18-24.99.1 | SUSE-SU-2022:0197-1 |
| SLES 15 SP1 | kernel-docs +5 | 4.12.14-197.105.1 | SUSE-SU-2022:0366-1 |
| SLES 15 | kernel-docs +6 | 4.12.14-150.83.1 | SUSE-SU-2022:0367-1 |
| SLES 12 SP5 | kernel-azure +2 | 4.12.14-16.85.1 | SUSE-SU-2022:0080-1 |
| SLES 12 SP5 | kernel-docs +4 | 4.12.14-122.106.1 | SUSE-SU-2022:0068-1 |
Show 28 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP4 | kernel-syms +2 | 4.12.14-95.88.1 | SUSE-SU-2022:0371-1 |
| SLES for SAP 15 SP2 | kernel-default-base | 5.3.18-24.99.1.9.46.1 | SUSE-SU-2022:0197-1 |
| SLES for SAP 15 SP2 | kernel-docs +5 | 5.3.18-24.99.1 | SUSE-SU-2022:0197-1 |
| SLES for SAP 15 SP1 | kernel-docs +4 | 4.12.14-197.105.1 | SUSE-SU-2022:0366-1 |
| SLES for SAP 15 | kernel-docs +5 | 4.12.14-150.83.1 | SUSE-SU-2022:0367-1 |
| SLES for SAP 12 SP5 | kernel-azure +2 | 4.12.14-16.85.1 | SUSE-SU-2022:0080-1 |
| SLES for SAP 12 SP5 | kernel-syms +2 | 4.12.14-122.106.1 | SUSE-SU-2022:0068-1 |
| SLES for SAP 12 SP4 | kernel-syms +2 | 4.12.14-95.88.1 | SUSE-SU-2022:0371-1 |
| SLE Real Time 12 SP5 | kernel-rt +3 | 4.12.14-10.73.1 | SUSE-SU-2022:0090-1 |
| SLE Micro 5.1 | kernel-default | 5.3.18-59.40.1 | SUSE-SU-2022:0131-1 |
| SLE Micro 5.1 | kernel-default-base | 5.3.18-59.40.1.18.25.1 | SUSE-SU-2022:0131-1 |
| SLE Micro 5.1 | kernel-rt | 5.3.18-68.1 | SUSE-SU-2022:0079-1 |
| SLE Micro 5.0 | kernel-default | 5.3.18-24.99.1 | SUSE-SU-2022:0197-1 |
| SLE Micro 5.0 | kernel-default-base | 5.3.18-24.99.1.9.46.1 | SUSE-SU-2022:0197-1 |
| SLE Micro 5.0 | kernel-rt | 5.3.18-65.2 | SUSE-SU-2022:0181-1 |
| SLE Live Patching 15 SP3 | kernel-default | 5.3.18-59.40.1 | SUSE-SU-2022:0131-1 |
| SLE Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_11 | 1-7.3.1 | SUSE-SU-2022:0131-1 |
| SLE Live Patching 15 SP2 | kernel-default | 5.3.18-24.99.1 | SUSE-SU-2022:0197-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_23 | 1-5.3.1 | SUSE-SU-2022:0197-1 |
| SLE Live Patching 15 SP1 | kernel-default | 4.12.14-197.105.1 | SUSE-SU-2022:0366-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_28 | 1-3.3.1 | SUSE-SU-2022:0366-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-150.83.1 | SUSE-SU-2022:0367-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_27 | 1-1.5.1 | SUSE-SU-2022:0367-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.106.1 | SUSE-SU-2022:0068-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_27 | 1-8.3.1 | SUSE-SU-2022:0068-1 |
| SLE Live Patching 12 SP4 | kernel-default | 4.12.14-95.88.1 | SUSE-SU-2022:0371-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_24 | 1-6.5.1 | SUSE-SU-2022:0371-1 |
| SLE HPC 15 SP2 | kernel-default-base | 5.3.18-24.99.1.9.46.1 | SUSE-SU-2022:0197-1 |
| SLE HPC 15 SP2 | kernel-docs +5 | 5.3.18-24.99.1 | SUSE-SU-2022:0197-1 |
| SLE HPC 15 SP1 | kernel-docs +4 | 4.12.14-197.105.1 | SUSE-SU-2022:0366-1 |
| SLE HPC 15 | kernel-docs +5 | 4.12.14-150.83.1 | SUSE-SU-2022:0367-1 |
| SUSE Real Time Module 15 SP3 | kernel-rt +3 | 5.3.18-68.1 | SUSE-SU-2022:0079-1 |
| SUSE Real Time Module 15 SP2 | kernel-rt +2 | 5.3.18-65.2 | SUSE-SU-2022:0181-1 |
| SUSE Real Time Module 15 SP2 | kernel-syms-rt | 5.3.18-65.1 | SUSE-SU-2022:0181-1 |
| SUSE Package Hub 15 SP3 | connman | 1.41-bp153.2.3.1 | openSUSE-SU-2022:0056-1 |
| SUSE OpenStack Cloud Crowbar 9 | kernel-syms +2 | 4.12.14-95.88.1 | SUSE-SU-2022:0371-1 |
| SUSE OpenStack Cloud 9 | kernel-syms +2 | 4.12.14-95.88.1 | SUSE-SU-2022:0371-1 |
| SUSE Manager Server 4.1 | kernel-default-base | 5.3.18-24.99.1.9.46.1 | SUSE-SU-2022:0197-1 |
| SUSE Manager Server 4.1 | kernel-docs +5 | 5.3.18-24.99.1 | SUSE-SU-2022:0197-1 |
| SUSE Manager Retail Branch Server 4.1 | kernel-default-base | 5.3.18-24.99.1.9.46.1 | SUSE-SU-2022:0197-1 |
| SUSE Manager Retail Branch Server 4.1 | kernel-docs +4 | 5.3.18-24.99.1 | SUSE-SU-2022:0197-1 |
| SUSE Manager Proxy 4.1 | kernel-default-base | 5.3.18-24.99.1.9.46.1 | SUSE-SU-2022:0197-1 |
| SUSE Manager Proxy 4.1 | kernel-docs +4 | 5.3.18-24.99.1 | SUSE-SU-2022:0197-1 |
| SUSE Enterprise Storage 7 | kernel-default-base | 5.3.18-24.99.1.9.46.1 | SUSE-SU-2022:0197-1 |
| SUSE Enterprise Storage 7 | kernel-docs +5 | 5.3.18-24.99.1 | SUSE-SU-2022:0197-1 |
| SUSE Enterprise Storage 6 | kernel-docs +4 | 4.12.14-197.105.1 | SUSE-SU-2022:0366-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | connman | 1.41-bp153.2.3.1 | openSUSE-SU-2022:0056-1 |
| openSUSE Leap 15.3 | dtb-aarch64 +7 | 5.3.18-59.40.1 | openSUSE-SU-2022:0131-1 |
| openSUSE Leap 15.3 | kernel-azure +2 | 5.3.18-38.34.1 | openSUSE-SU-2022:0056-1 |
| openSUSE Leap 15.3 | kernel-debug +4 | 4.12.14-197.105.1 | openSUSE-SU-2022:0366-1, openSUSE-SU-2022:0131-1 |
| openSUSE Leap 15.3 | kernel-default-base | 5.3.18-59.40.1.18.25.1 | openSUSE-SU-2022:0131-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | kernel-livepatch-4.14.262-200.489 | 1.0-0.amzn2 | ALAS2-2022-1749 |
| Amazon Linux 2 | perf +8 | 4.14.262-200.489.amzn2 | ALAS2-2022-1749 |
Advisories 27
- USN-8966-1 linux, linux-aws, linux-fips, linux-kvm, linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- WID-SEC-2023-0875 Xen: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Nov 2, 2026
- USN-5278-1 linux-oem-5.14 vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5338-1 linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-azure-fde, linux-gcp, linux-gcp-5.4, linux-gke, lnux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-ibm, linux-ibm-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5298-1 linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-dell300x, linux-gcp, linux-gcp-4.15, linux-hwe, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5368-1 linux-azure-5.13, linux-oracle-5.13 vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5377-1 linux-bluefield vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- USN-5337-1 linux, linux-aws, linux-aws-5.13, linux-gcp, linux-gcp-5.13, linux-hwe-5.13, linux-kvm, linux-oracle, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- DSA-5050-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5096-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2940-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2941-1 linux-4.19 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2022:0056-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0090-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0080-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2022:0366-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2022:0131-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0367-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2022:0056-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0131-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0371-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0068-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0197-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2-2022-1749 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · May 19, 2025
- SUSE-SU-2022:0181-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2022:0079-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2022:0366-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
References
- https://xenbits.xenproject.org/xsa/advisory-392.txt
- DSA-5050 vendor-advisory
- [debian-lts-announce] 20220309 [SECURITY] [DLA 2940-1] linux security update mailing-list
- [debian-lts-announce] 20220309 [SECURITY] [DLA 2941-1] linux-4.19 security update mailing-list
- DSA-5096 vendor-advisory