CVE - CVE-2024-49987

CVE-ID
CVE-2024-49987	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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 expected by a function with variable number of arguments, the behavior is undefined." To avoid this, add an early return when nf_link_info is NULL to prevent calling qsort with a NULL pointer.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/2e0f6f33f2aa87493b365a38a8fd87b8854b7734 URL:https://git.kernel.org/stable/c/2e0f6f33f2aa87493b365a38a8fd87b8854b7734 MISC:https://git.kernel.org/stable/c/c208b02827eb642758cef65641995fd3f38c89af URL:https://git.kernel.org/stable/c/c208b02827eb642758cef65641995fd3f38c89af MISC:https://git.kernel.org/stable/c/c2d9f9a7837ab29ccae0c42252f17d436bf0a501 URL:https://git.kernel.org/stable/c/c2d9f9a7837ab29ccae0c42252f17d436bf0a501 MISC:https://git.kernel.org/stable/c/f04e2ad394e2755d0bb2d858ecb5598718bf00d5 URL:https://git.kernel.org/stable/c/f04e2ad394e2755d0bb2d858ecb5598718bf00d5
Assigning CNA
kernel.org
Date Record Created
20241021	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241021)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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