CVE-2024-45020

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix a kernel verifier crash in stacksafe() Daniel Hodges reported a kernel verifier crash when playing with sched-ext. Further investigation shows that the crash is due to invalid memory access in stacksafe(). More specifically, it is the following code: if (exact != NOT_EXACT && old->stack[spi].slot_type[i % BPF_REG_SIZE] != cur->stack[spi].slot_type[i % BPF_REG_SIZE]) return false; The 'i' iterates old->allocated_stack. If cur->allocated_stack < old->allocated_stack the out-of-bound access will happen. To fix the issue add 'i >= cur->allocated_stack' check such that if the condition is true, stacksafe() should fail. Otherwise, cur->stack[spi].slot_type[i % BPF_REG_SIZE] memory access is legal.

Affected products

Alt Linux, Almalinux, Linuxmint, Linux Kernel, Red Hat, Red Os, Suse, Ubuntu

Linux Linux Kernel

< 6.6.48, 6.10.7, 6.11

CVSS 3.1

7.8 HIGH

EPSS

0.2% (14th percentile)

Weakness

CWE-787

NVD status

Modified

Published

2024-09-11