{"id":"CVE-2024-49987","summary":"bpftool: Fix undefined behavior in qsort(NULL, 0, ...)","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpftool: Fix undefined behavior in qsort(NULL, 0, ...)\n\nWhen netfilter has no entry to display, qsort is called with\nqsort(NULL, 0, ...). This results in undefined behavior, as UBSan\nreports:\n\nnet.c:827:2: runtime error: null pointer passed as argument 1, which is declared to never be null\n\nAlthough the C standard does not explicitly state whether calling qsort\nwith a NULL pointer when the size is 0 constitutes undefined behavior,\nSection 7.1.4 of the C standard (Use of library functions) mentions:\n\n\"Each of the following statements applies unless explicitly stated\notherwise in the detailed descriptions that follow: If an argument to a\nfunction has an invalid value (such as a value outside the domain of\nthe function, or a pointer outside the address space of the program, or\na null pointer, or a pointer to non-modifiable storage when the\ncorresponding parameter is not const-qualified) or a type (after\npromotion) not expected by a function with variable number of\narguments, the behavior is undefined.\"\n\nTo avoid this, add an early return when nf_link_info is NULL to prevent\ncalling qsort with a NULL pointer.","modified":"2026-04-02T12:21:11.754424Z","published":"2024-10-21T18:02:31.209Z","related":["MGASA-2024-0344","MGASA-2024-0345","SUSE-SU-2024:4157-1","SUSE-SU-2024:4314-1","SUSE-SU-2024:4316-1","SUSE-SU-2024:4318-1","SUSE-SU-2024:4387-1","SUSE-SU-2025:20163-1","SUSE-SU-2025:20164-1","SUSE-SU-2025:20246-1","SUSE-SU-2025:20247-1","USN-7276-1","USN-7277-1","openSUSE-SU-2024:14500-1","openSUSE-SU-2025:14705-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49987.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2e0f6f33f2aa87493b365a38a8fd87b8854b7734"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c208b02827eb642758cef65641995fd3f38c89af"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c2d9f9a7837ab29ccae0c42252f17d436bf0a501"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f04e2ad394e2755d0bb2d858ecb5598718bf00d5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49987.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-49987"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d0fe92fb5e3df6991c640fb9205d880b68603259"},{"fixed":"c2d9f9a7837ab29ccae0c42252f17d436bf0a501"},{"fixed":"2e0f6f33f2aa87493b365a38a8fd87b8854b7734"},{"fixed":"c208b02827eb642758cef65641995fd3f38c89af"},{"fixed":"f04e2ad394e2755d0bb2d858ecb5598718bf00d5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-49987.json"}}],"schema_version":"1.7.5"}