CVE-2024-49987

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

bpftool: Fix undefined behavior in qsort(NULL, 0, ...)

When netfilter has no entry to display, qsort is called with

qsort(NULL, 0, ...). This results in undefined behavior, as UBSan

reports:

net.c:827:2: runtime error: null pointer passed as argument 1, which is declared to never be null

Although the C standard does not explicitly state whether calling qsort

with a NULL pointer when the size is 0 constitutes undefined behavior,

Section 7.1.4 of the C standard (Use of library functions) mentions:

"Each of the following statements applies unless explicitly stated

otherwise in the detailed descriptions that follow: If an argument to a

function has an invalid value (such as a value outside the domain of

the function, or a pointer outside the address space of the program, or

a null pointer, or a pointer to non-modifiable storage when the

corresponding parameter is not const-qualified) or a type (after

promotion) not ex

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References