High [CVE-2022-0500] flaw was found in unrestricted eBPF usage by the BPF_BTF_LOAD, leading to a possible out-of-bounds memory write in the Linux kernel’s BPF subsystem due to the way a user loads BTF
This high-severity Red Hat Linux advisory covers CVE-2022-0500 affecting Red Hat Enterprise Linux 8.6 Extended Update Support, Red Hat Enterprise Linux 8.8 Extended Update Support, Red Hat Virtualization 4 for Red Hat Enterprise Linux 8.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
A flaw was found in unrestricted eBPF usage by the BPF_BTF_LOAD, leading to a possible out-of-bounds memory write in the Linux kernel’s BPF subsystem due to the way a user loads BTF. This flaw allows a local user to crash or escalate their privileges on the system.
Red Hat severity: Moderate — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-787.
Affected Red Hat products: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 8.6 Extended Update Support; Red Hat Enterprise Linux 8.8 Extended Update Support; Red Hat Virtualization 4 for Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Red Hat lists Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7 as not affected.
Will not fix / out of support: Red Hat Enterprise Linux 9. Red Hat fixing advisory: RHSA-2024:2950, RHSA-2024:3138, RHSA-2024:0724, RHSA-2024:10262.
Affected products named by the advisory: Red Hat package: kernel-rt.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
- kernel-rt-0:4.18.0-553.rt7.342.el8_10
- kernel-0:4.18.0-553.el8_10
- kernel-0:4.18.0-372.91.1.el8_6
- kernel-0:4.18.0-477.81.1.el8_8
- RHSA-2024:2950
- RHSA-2024:3138
- RHSA-2024:0724
- RHSA-2024:10262
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
Mitigation checklist
- The default Red Hat Enterprise Linux kernel prevents unprivileged users from being able to use eBPF by the kernel.unprivileged_bpf_disabled sysctl. This would require a privileged user with CAP_SYS_ADMIN or root to be able to abuse this flaw reducing its attack space. For Red Hat Enterprise Linux 7 the eBPF for unprivileged users is always disabled. For Red Hat Enterprise Linux 8 to confirm the current state, inspect the sysctl with the command: ``` # cat /proc/sys/kernel/unprivileged_bpf_disabled ``` The setting of 1 would mean that unprivileged users can not use eBPF, mitigating the flaw. A kernel update will be required to mitigate the flaw for the root or users with CAP_SYS_ADMIN (or CAP_BPF) capabilities.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
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