Description
It was discovered that the eBPF implementation in the Linux kernel did not properly track bounds information for 32 bit registers when performing div and mod operations. A local attacker could use this to possibly execute arbitrary code.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| The Linux Kernel Organization | linux | < 5.11 | 5.11 |
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 | 5.10.19-1 | — |
| Debian 13 | linux | 5.10.19-1 | — |
| Debian 12 | linux | 5.10.19-1 | — |
| Debian 9 | linux-4.19 | 4.19.208-1~deb9u1 | DLA-2785-1 |
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 | — |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1041.43 | — |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1043.45 | — |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1040.43 | — |
| Ubuntu 20.04 LTS | linux-gke | 5.4.0-1039.41 | — |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1012.13 | — |
| Ubuntu 20.04 LTS | linux-hwe-5.8 | 5.8.0-48.54~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1036.37 | — |
| Ubuntu 20.04 LTS | linux-oem-5.10 | 5.10.0-1017.18 | — |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1041.44 | — |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1032.35 | — |
| Ubuntu 20.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-riscv-5.8 | 5.8.0-20.22~20.04.1 | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-147.151 | USN-5003-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1106.113 | USN-5003-1 |
| Ubuntu 18.04 LTS | linux-aws-5.4 | 5.4.0-1041.43~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-azure-4.15 | 4.15.0-1118.131 | USN-5003-1 |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1043.45~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-dell300x | 4.15.0-1022.26 | USN-5003-1 |
| Ubuntu 18.04 LTS | linux-gcp +13 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1103.116 | USN-5003-1 |
| Ubuntu 18.04 LTS | linux-gcp-5.4 | 5.4.0-1040.43~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gke-5.3 | 5.3.0-1041.44 | — |
| Ubuntu 18.04 LTS | linux-gke-5.4 | 5.4.0-1039.41~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gkeop-5.4 | 5.4.0-1012.13~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-70.78~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1094.96 | — |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1075.83 | USN-5003-1 |
| Ubuntu 18.04 LTS | linux-oracle-5.4 | 5.4.0-1041.44~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1032.35~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1089.94 | USN-5003-1 |
| Ubuntu 18.04 LTS | linux-raspi2-5.3 | 5.3.0-1038.40 | — |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1106.115 | USN-5003-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 10 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 | 4.15.0-2048.50 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2030.33 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1063.71 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro 20.04 LTS | linux | 5.4.0-80.90 | LSN-0079-1 |
| Ubuntu Pro 20.04 LTS | linux-gcp | 5.4.0-1049.53 | LSN-0079-1 |
| Ubuntu Pro 20.04 LTS | linux-gke | 5.4.0-1049.52 | LSN-0079-1 |
| Ubuntu Pro 20.04 LTS | linux-gkeop | 5.4.0-1021.22 | LSN-0079-1 |
| Ubuntu Pro 18.04 LTS | linux | 4.15.0-151.157 | LSN-0079-1 |
| Ubuntu Pro 18.04 LTS | linux-gke-5.4 | 5.4.0-1049.52~18.04.1 | LSN-0079-1 |
| Ubuntu Pro 18.04 LTS | linux-gkeop-5.4 | 5.4.0-1021.22~18.04.1 | LSN-0079-1 |
| Ubuntu Pro 18.04 LTS | linux-hwe-5.4 | 5.4.0-80.90~18.04.1 | LSN-0079-1 |
| Ubuntu Pro 18.04 LTS | linux-oem +1 | No fix yet | LSN-0079-1 |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-212.244 | LSN-0079-1 |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1106.113~16.04.1 | USN-5003-1 |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1118.131~16.04.1 | USN-5003-1 |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1103.116~16.04.1 | USN-5003-1 |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-147.151~16.04.1 | USN-5003-1 |
| Ubuntu Pro 16.04 LTS | linux-oracle | 4.15.0-1075.83~16.04.1 | USN-5003-1 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1118.131~14.04.1 | USN-5003-1 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-212.244~14.04.1 | LSN-0079-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | kernel-rt +12 | 4.18.0-348.rt7.130.el8 | RHSA-2021:4140 |
| RHEL 8 | perf +26 | 4.18.0-348.el8 | RHSA-2021:4356 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | kernel-tools-libs-devel | 4.18.0-348.el8 | ALSA-2021:4356 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | perf +19 | 4.18.0-348.el8 | ELSA-2021-4356 |
Advisories 7
- ALSA-2021:4356 Moderate: kernel security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2021:4356 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 2, 2026
- RHSA-2021:4140 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Aug 14, 2026
- USN-5003-1 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) · Jun 29, 2026
- LSN-0079-1 Kernel Live Patch Security Notice Ubuntu Security Notices (USN) · Jun 3, 2026
- DLA-2785-1 linux-4.19 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- ELSA-2021-4356 Moderate: kernel security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 16, 2021
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3600 issue-tracking
- https://ubuntu.com/security/notices/USN-5003-1 third-party-advisory
- https://git.kernel.org/linus/e88b2c6e5a4d9ce30d75391e4d950da74bb2bd90 issue-tracking