Description
A flaw was found in the Linux kernel in versions before 5.4.92 in the BPF protocol. This flaw allows an attacker with a local account to leak information about kernel internal addresses. The highest threat from this vulnerability is to confidentiality.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | kernel | kernel 5.4.92 | — |
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 | 5.10.4-1 | — |
| Debian 13 | linux | 5.10.4-1 | — |
| Debian 12 | linux | 5.10.4-1 | — |
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 | 5.4.0-67.75 | USN-4878-1 |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1039.41 | USN-4878-1 |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1041.43 | USN-4878-1 |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1038.41 | USN-4878-1 |
| Ubuntu 20.04 LTS | linux-gke | 5.4.0-1037.39 | — |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1011.12 | USN-4878-1 |
| Ubuntu 20.04 LTS | linux-hwe-5.8 | 5.8.0-49.55~20.04.1 | USN-4910-1 |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1034.35 | USN-4878-1 |
| Ubuntu 20.04 LTS | linux-oem-5.6 | 5.6.0-1050.54 | — |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1039.42 | USN-4878-1 |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1030.33 | USN-4878-1 |
| Ubuntu 20.04 LTS | linux-riscv +1 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-riscv-5.8 | 5.8.0-22.24~20.04.1 | — |
| Ubuntu 18.04 LTS | linux-aws-5.4 | 5.4.0-1039.41~18.04.1 | USN-4878-1 |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1041.43~18.04.1 | USN-4878-1 |
| Ubuntu 18.04 LTS | linux-gcp +13 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-5.4 | 5.4.0-1038.41~18.04.1 | USN-4878-1 |
| Ubuntu 18.04 LTS | linux-gke-5.4 | 5.4.0-1037.39~18.04.1 | USN-4878-1 |
| Ubuntu 18.04 LTS | linux-gkeop-5.4 | 5.4.0-1011.12~18.04.2 | USN-4878-1 |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-67.75~18.04.1 | USN-4878-1 |
| Ubuntu 18.04 LTS | linux-oracle-5.4 | 5.4.0-1039.42~18.04.1 | USN-4878-1 |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1030.33~18.04.1 | USN-4878-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 2 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-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 | — |
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 6
- 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-4910-1 linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oracle, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4878-1 linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- ELSA-2021-4356 Moderate: kernel security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 16, 2021