CVE-2023-52462: bpf: fix check for attempt to corrupt spilled pointer

Severity: medium (CVSS 5.5 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: 2024-02-23 · updated 2026-06-17
Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: fix check for attempt to corrupt spilled pointer When register is spilled onto a stack as a 1/2/4-byte register, we set slot_type[BPF_REG_SIZE - 1] (plus potentially few more below it, depending on actual spill size). So to check if some stack slot has spilled register we need to consult slot_type[7], not slot_type[0]. To avoid the need to remember and double-check this in the future, just use is_spilled_reg() helper.

Affected products

Linux kernel: before 5.10.209; from 5.11.0 before 5.15.148; from 5.16.0 before 6.1.75; from 6.2.0 before 6.6.14; from 6.7.0 before 6.7.2 — fixed in 5.10.209, 5.15.148, 6.1.75, 6.6.14, 6.7.2

How to fix

Upgrade to a fixed version: Linux kernel 5.10.209, 5.15.148, 6.1.75, 6.6.14. Check the vendor advisory for mitigations.

References

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