Description
An issue was discovered in the Linux kernel before 5.11.8. kernel/bpf/verifier.c performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory, aka CID-f232326f6966. This affects pointer types that do not define a ptr_limit.
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 | 5.10.24-1 | — |
| Debian 13 | linux | 5.10.24-1 | — |
| Debian 12 | linux | 5.10.24-1 | — |
| Debian 9 | linux-4.19 | 4.19.181-1~deb9u1 | DLA-2610-1 |
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 | 5.4.0-70.78 | USN-4887-1 |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1041.43 | USN-4887-1 |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1043.45 | USN-4887-1 |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1040.43 | USN-4887-1 |
| Ubuntu 20.04 LTS | linux-gke | 5.4.0-1039.41 | — |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1012.13 | USN-4887-1 |
| Ubuntu 20.04 LTS | linux-hwe-5.8 | 5.8.0-48.54~20.04.1 | USN-4887-1 |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1036.37 | USN-4887-1 |
| Ubuntu 20.04 LTS | linux-oem-5.10 | 5.10.0-1019.20 | USN-4887-1 |
| Ubuntu 20.04 LTS | linux-oem-5.6 | 5.6.0-1052.56 | USN-4887-1 |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1041.44 | USN-4887-1 |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1032.35 | USN-4887-1 |
| Ubuntu 20.04 LTS | linux-riscv +1 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-riscv-5.8 | 5.8.0-20.22~20.04.1 | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-140.144 | USN-4890-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1097.104 | USN-4890-1 |
| Ubuntu 18.04 LTS | linux-aws-5.4 | 5.4.0-1041.43~18.04.1 | USN-4887-1 |
| Ubuntu 18.04 LTS | linux-azure-4.15 | 4.15.0-1111.123 | USN-4890-1 |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1043.45~18.04.1 | USN-4887-1 |
| Ubuntu 18.04 LTS | linux-dell300x | 4.15.0-1015.19 | USN-4890-1 |
| Ubuntu 18.04 LTS | linux-gcp +12 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1096.109 | USN-4890-1 |
| Ubuntu 18.04 LTS | linux-gcp-5.4 | 5.4.0-1040.43~18.04.1 | USN-4887-1 |
| Ubuntu 18.04 LTS | linux-gke-5.3 | 5.3.0-1041.44 | USN-4887-1 |
| Ubuntu 18.04 LTS | linux-gke-5.4 | 5.4.0-1039.41~18.04.1 | USN-4887-1 |
| Ubuntu 18.04 LTS | linux-gkeop-5.4 | 5.4.0-1012.13~18.04.1 | USN-4887-1 |
| Ubuntu 18.04 LTS | linux-hwe | 5.3.0-72.68 | USN-4887-1 |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-70.78~18.04.1 | USN-4887-1 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1088.90 | USN-4890-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1068.76 | USN-4890-1 |
| Ubuntu 18.04 LTS | linux-oracle-5.4 | 5.4.0-1041.44~18.04.1 | USN-4887-1 |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1032.35~18.04.1 | USN-4887-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1082.87 | USN-4890-1 |
| Ubuntu 18.04 LTS | linux-raspi2-5.3 | 5.3.0-1038.40 | USN-4887-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1099.108 | USN-4890-1 |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1097.104~16.04.1 | USN-4890-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1111.123~16.04.1 | USN-4890-1 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1096.109~16.04.1 | USN-4890-1 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-140.144~16.04.1 | USN-4890-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1068.76~16.04.1 | USN-4890-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 20.04 LTS | linux-aws-fips +2 | 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-gcp-fips | 5.4.0-1067.71~20.04.1 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2040.42 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2023.26 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1056.64 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro 16.04 LTS | linux +2 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws +1 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1111.123~14.04.1 | USN-4890-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | kernel-rt +10 | 3.10.0-1160.31.1.rt56.1169.el7 | RHSA-2021:2316 |
| RHEL 7 | perf +18 | 3.10.0-1160.31.1.el7 | RHSA-2021:2314 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | kernel-64kb +5 | 5.3.18-59.5.2 | SUSE-SU-2021:1977-1 |
| SLES 15 SP3 | kernel-azure +2 | 5.3.18-38.3.1 | SUSE-SU-2021:1975-1 |
| SLES 15 SP3 | kernel-default-base | 5.3.18-59.5.2.18.2.2 | SUSE-SU-2021:1977-1 |
| SLES 15 SP3 | kernel-syms +1 | 5.3.18-59.5.1 | SUSE-SU-2021:1977-1 |
| SLES 15 SP2 | kernel-azure +2 | 5.3.18-18.41.1 | SUSE-SU-2021:1177-1 |
| SLES 15 SP2 | kernel-default-base | 5.3.18-24.61.1.9.26.4 | SUSE-SU-2021:1238-1 |
| SLES 15 SP2 | kernel-docs +5 | 5.3.18-24.61.1 | SUSE-SU-2021:1238-1 |
| SLES 15 SP1 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SLES 15 SP1 | kernel-syms +4 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
| SLES 15 | kernel-docs | 4.12.14-150.72.2 | SUSE-SU-2021:1573-1 |
| SLES 15 | kernel-syms +5 | 4.12.14-150.72.1 | SUSE-SU-2021:1573-1 |
| SLES 12 SP5 | kernel-azure +2 | 4.12.14-16.50.1 | SUSE-SU-2021:1175-1 |
| SLES 12 SP5 | kernel-docs +4 | 4.12.14-122.66.2 | SUSE-SU-2021:1210-1 |
Show 22 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP4 | kernel-syms +2 | 4.12.14-95.74.1 | SUSE-SU-2021:1596-1 |
| SLES for SAP 15 SP1 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SLES for SAP 15 SP1 | kernel-syms +3 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
| SLES for SAP 15 | kernel-docs | 4.12.14-150.72.2 | SUSE-SU-2021:1573-1 |
| SLES for SAP 15 | kernel-syms +4 | 4.12.14-150.72.1 | SUSE-SU-2021:1573-1 |
| SLES for SAP 12 SP5 | kernel-azure +2 | 4.12.14-16.50.1 | SUSE-SU-2021:1175-1 |
| SLES for SAP 12 SP5 | kernel-syms +2 | 4.12.14-122.66.2 | SUSE-SU-2021:1210-1 |
| SLES for SAP 12 SP4 | kernel-syms +2 | 4.12.14-95.74.1 | SUSE-SU-2021:1596-1 |
| SLE Real Time 12 SP5 | kernel-rt +3 | 4.12.14-10.37.1 | SUSE-SU-2021:1176-1 |
| SLE Micro 5.0 | kernel-default | 5.3.18-24.61.1 | SUSE-SU-2021:1238-1 |
| SLE Micro 5.0 | kernel-default-base | 5.3.18-24.61.1.9.26.4 | SUSE-SU-2021:1238-1 |
| SLE Micro 5.0 | kernel-rt | 5.3.18-8.7.1 | SUSE-SU-2021:1625-1 |
| SLE Live Patching 15 SP3 | kernel-default | 5.3.18-59.5.2 | SUSE-SU-2021:1977-1 |
| SLE Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_1 | 1-7.5.1 | SUSE-SU-2021:1977-1 |
| SLE Live Patching 15 SP2 | kernel-default | 5.3.18-24.61.1 | SUSE-SU-2021:1238-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_12 | 1-5.3.4 | SUSE-SU-2021:1238-1 |
| SLE Live Patching 15 SP1 | kernel-default | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_24 | 1-3.3.2 | SUSE-SU-2021:1624-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-150.72.1 | SUSE-SU-2021:1573-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_24 | 1-1.3.1 | SUSE-SU-2021:1573-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.66.2 | SUSE-SU-2021:1210-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_17 | 1-8.3.2 | SUSE-SU-2021:1210-1 |
| SLE Live Patching 12 SP4 | kernel-default | 4.12.14-95.74.1 | SUSE-SU-2021:1596-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_20 | 1-6.3.1 | SUSE-SU-2021:1596-1 |
| SLE HPC 15 SP1 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SLE HPC 15 SP1 | kernel-syms +3 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
| SLE HPC 15 | kernel-docs | 4.12.14-150.72.2 | SUSE-SU-2021:1573-1 |
| SLE HPC 15 | kernel-syms +4 | 4.12.14-150.72.1 | SUSE-SU-2021:1573-1 |
| SUSE Real Time Module 15 SP2 | kernel-rt +3 | 5.3.18-33.1 | SUSE-SU-2021:1211-1 |
| SUSE OpenStack Cloud Crowbar 9 | kernel-syms +2 | 4.12.14-95.74.1 | SUSE-SU-2021:1596-1 |
| SUSE OpenStack Cloud 9 | kernel-syms +2 | 4.12.14-95.74.1 | SUSE-SU-2021:1596-1 |
| SUSE Manager Server 4.0 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SUSE Manager Server 4.0 | kernel-syms +4 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
| SUSE Manager Retail Branch Server 4.0 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SUSE Manager Retail Branch Server 4.0 | kernel-syms +3 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
| SUSE Manager Proxy 4.0 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SUSE Manager Proxy 4.0 | kernel-syms +3 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
| SUSE Enterprise Storage 6 | kernel-docs | 4.12.14-197.89.3 | SUSE-SU-2021:1624-1 |
| SUSE Enterprise Storage 6 | kernel-syms +3 | 4.12.14-197.89.2 | SUSE-SU-2021:1624-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | kernel-64kb +7 | 5.3.18-59.5.2 | openSUSE-SU-2021:1977-1 |
| openSUSE Leap 15.3 | kernel-azure +2 | 5.3.18-38.3.1 | openSUSE-SU-2021:1975-1 |
| openSUSE Leap 15.3 | kernel-default-base | 5.3.18-59.5.2.18.2.2 | openSUSE-SU-2021:1977-1 |
| openSUSE Leap 15.3 | kernel-syms +2 | 5.3.18-59.5.1 | openSUSE-SU-2021:1977-1 |
| openSUSE Leap 15.2 | kernel-default-base | 5.3.18-lp152.69.1.lp152.8.28.1 | openSUSE-SU-2021:0532-1 |
| openSUSE Leap 15.2 | kernel-docs +8 | 5.3.18-lp152.69.1 | openSUSE-SU-2021:0532-1 |
| openSUSE Leap 15.2 | kernel-rt +3 | 5.3.18-lp152.3.8.1 | openSUSE-SU-2021:0758-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | kernel | 5.10.78.1-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | kernel-uek +8 | 4.14.35-2047.503.1.el7uek | ELSA-2021-9222, ELSA-2021-9140 |
| Oracle Linux 7 | kernel-uek-container | 4.14.35-2047.503.1.el7 | ELSA-2021-9223, ELSA-2021-9141 |
| Oracle Linux 7 | kernel-uek-container-debug | 5.4.17-2102.200.13.el8 | ELSA-2021-9141 |
| Oracle Linux 7 | perf +12 | 3.10.0-1160.31.1.el7 | ELSA-2021-9222, ELSA-2021-9140, ELSA-2021-2314 |
Advisories 28
- RHSA-2021:2316 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2021:2314 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- WID-SEC-2025-0227 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
- USN-4890-1 linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-dell300x, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle, linux-raspi2 linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4887-1 linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke-5.3, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe, linux-hwe-5.4, linux-hwe-5.8, linux-kvm, linux-oem-5.10, linux-oem-5.6, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4, linux-raspi2-5.3 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- DLA-2610-1 linux-4.19 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2021:1238-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1573-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1211-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1210-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1975-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1625-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1596-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1177-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1175-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0758-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1624-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0532-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1977-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1176-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-0063 Juniper Junos Space: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 8, 2025
- SUSE-SU-2021:1975-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2021:1977-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2021-2314 Important: kernel security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jun 10, 2021
- ELSA-2021-9223 Important: Unbreakable Enterprise kernel-container security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 10, 2021
- ELSA-2021-9222 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 10, 2021
- ELSA-2021-9141 Important: Unbreakable Enterprise kernel-container security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 31, 2021
- ELSA-2021-9140 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 31, 2021
References
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.8
- https://www.openwall.com/lists/oss-security/2021/03/19/2
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f232326f6966cf2a1d1db7bc917a4ce5f9f55f76
- FEDORA-2021-f0181b8085 vendor-advisory
- FEDORA-2021-e49da8a226 vendor-advisory
- [oss-security] 20210324 Re: [CVE-2020-27170] Protection against speculatively out-of-bounds loads in the Linux kernel can be bypassed by unprivileged local users to leak content of kernel memory mailing-list
- FEDORA-2021-9503fffad9 vendor-advisory
- [debian-lts-announce] 20210330 [SECURITY] [DLA 2610-1] linux-4.19 security update mailing-list
- http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html