What’s Vulnerable › Vulnerabilities

CVE-2024-33619: efi: libstub: only free priv.runtime_map when allocated

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-06-21 · updated 2026-08-04
• Weakness: CWE-908

Description

In the Linux kernel, the following vulnerability has been resolved: efi: libstub: only free priv.runtime_map when allocated priv.runtime_map is only allocated when efi_novamap is not set. Otherwise, it is an uninitialized value. In the error path, it is freed unconditionally. Avoid passing an uninitialized value to free_pool. Free priv.runtime_map only when it was allocated. This bug was discovered and resolved using Coverity Static Analysis Security Testing (SAST) by Synopsys, Inc.

Affected products

• Linux kernel: from 6.1 before 6.1.93; from 6.2 before 6.6.33; from 6.7 before 6.9.4 — fixed in 6.1.93, 6.6.33, 6.9.4

How to fix

Upgrade to a fixed version: Linux kernel 6.1.93, 6.6.33, 6.9.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/4b2543f7e1e6b91cfc8dd1696e3cdf01c3ac8974
• https://git.kernel.org/stable/c/6ca67a5fe1c606d1fbe24c30a9fc0bdc43a18554
• https://git.kernel.org/stable/c/9dce01f386c9ce6990c0a83fa14b1c95330b037e
• https://git.kernel.org/stable/c/b8938d6f570f010a1dcdbfed3e5b5d3258c2a908
• https://git.kernel.org/stable/c/4b2543f7e1e6b91cfc8dd1696e3cdf01c3ac8974
• https://git.kernel.org/stable/c/6ca67a5fe1c606d1fbe24c30a9fc0bdc43a18554
• https://git.kernel.org/stable/c/9dce01f386c9ce6990c0a83fa14b1c95330b037e
• https://git.kernel.org/stable/c/b8938d6f570f010a1dcdbfed3e5b5d3258c2a908

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