CVE-2024-35905: bpf: Protect against int overflow for stack access size

Severity: high (CVSS 7.8 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: 2024-05-19 · updated 2026-10-15
Weakness: CWE-129

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Protect against int overflow for stack access size This patch re-introduces protection against the size of access to stack memory being negative; the access size can appear negative as a result of overflowing its signed int representation. This should not actually happen, as there are other protections along the way, but we should protect against it anyway. One code path was missing such protections (fixed in the previous patch in the series), causing out-of-bounds array accesses in check_stack_range_initialized(). This patch causes the verification of a program with such a non-sensical access size to fail. This check used to exist in a more indirect way, but was inadvertendly removed in a833a17aeac7.

Affected products

Debian Linux: 10.0
Linux kernel: from 5.10.209 before 5.10.215; from 5.15.148 before 5.15.154; from 6.1.75 before 6.1.85; from 6.6.14 before 6.6.26; from 6.7.2 before 6.8.5; 6.9-rc1 — fixed in 5.10.215, 5.15.154, 6.1.85, 6.6.26, 6.8.5

How to fix

Upgrade to a fixed version: Linux kernel 5.10.215, 5.15.154, 6.1.85, 6.6.26. Check the vendor advisory for mitigations.

References

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