CVE-2024-38662: bpf: Allow delete from sockmap/sockhash only if update is allowed

Severity: medium (CVSS 4.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-06-21 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Allow delete from sockmap/sockhash only if update is allowed We have seen an influx of syzkaller reports where a BPF program attached to a tracepoint triggers a locking rule violation by performing a map_delete on a sockmap/sockhash. We don't intend to support this artificial use scenario. Extend the existing verifier allowed-program-type check for updating sockmap/sockhash to also cover deleting from a map. From now on only BPF programs which were previously allowed to update sockmap/sockhash can delete from these map types.

Affected products

Linux kernel: from 5.10 before 5.10.219; from 5.15 before 5.15.161; from 6.1 before 6.1.93; from 6.6 before 6.6.33; from 6.9 before 6.9.4; 6.10.0-rc1 — fixed in 5.10.219, 5.15.161, 6.1.93, 6.6.33, 6.9.4

How to fix

Upgrade to a fixed version: Linux kernel 5.10.219, 5.15.161, 6.1.93, 6.6.33. Check the vendor advisory for mitigations.

References

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