CVE-2021-33624: In kernel/bpf/verifier.c in the Linux kernel before 5.12.13, a branch can be mispredicted (e.g., because of...

Security readout for executives and security teams

CVE-2021-33624 is a Linux kernel BPF verifier flaw where an unprivileged program could infer arbitrary kernel memory through a side-channel. This is most relevant on systems allowing untrusted local users or workloads to execute BPF. The source bundle does not show known active exploitation. Exposure is likely limited to Linux systems running vulnerable kernels before 5.12.13 or unpatched vendor backports, especially multi-user hosts, shared build systems, and container platforms where untrusted users or workloads can access BPF. Address through normal kernel security patching, with higher priority for shared Linux infrastructure. The business risk is local information disclosure from kernel memory, not a remotely exploitable service takeover based on the provided evidence. Mitigation focus: Update affected Linux kernels to a fixed vendor-supported release.; Confirm vendor backports include upstream commit 9183671af6db or equivalent fix.; Apply Debian LTS or other distribution kernel security updates where applicable..

Prepared

Jun 2, 2026, 19:36 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.