{"id":"CVE-2024-49987","state":"PUBLISHED","title":"bpftool: Fix undefined behavior in qsort(NULL, 0, ...)","description":"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.","publishedAt":"2024-10-21T18:02:31.209Z","updatedAt":"2026-05-11T20:43:23.326Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d0fe92fb5e3df6991c640fb9205d880b68603259","status":"affected","lessThan":"c2d9f9a7837ab29ccae0c42252f17d436bf0a501","versionType":"git"},{"version":"d0fe92fb5e3df6991c640fb9205d880b68603259","status":"affected","lessThan":"2e0f6f33f2aa87493b365a38a8fd87b8854b7734","versionType":"git"},{"version":"d0fe92fb5e3df6991c640fb9205d880b68603259","status":"affected","lessThan":"c208b02827eb642758cef65641995fd3f38c89af","versionType":"git"},{"version":"d0fe92fb5e3df6991c640fb9205d880b68603259","status":"affected","lessThan":"f04e2ad394e2755d0bb2d858ecb5598718bf00d5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["tools/bpf/bpftool/net.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.4","versionType":"semver"},{"version":"6.6.55","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.10.14","status":"unaffected","lessThanOrEqual":"6.10.*","versionType":"semver"},{"version":"6.11.3","status":"unaffected","lessThanOrEqual":"6.11.*","versionType":"semver"},{"version":"6.12","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["tools/bpf/bpftool/net.c"]}],"references":["https://git.kernel.org/stable/c/c2d9f9a7837ab29ccae0c42252f17d436bf0a501","https://git.kernel.org/stable/c/2e0f6f33f2aa87493b365a38a8fd87b8854b7734","https://git.kernel.org/stable/c/c208b02827eb642758cef65641995fd3f38c89af","https://git.kernel.org/stable/c/f04e2ad394e2755d0bb2d858ecb5598718bf00d5"],"weaknesses":[],"ingestedAt":"2026-10-29T20:07:56.516Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/49xxx/CVE-2024-49987.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-49987","state":"PUBLISHED","datePublished":"2024-10-21T18:02:31.209Z","dateUpdated":"2026-05-11T20:43:23.326Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-10-21T12:17:06.054Z"},"containers":{"cna":{"title":"bpftool: Fix undefined behavior in qsort(NULL, 0, ...)","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d0fe92fb5e3df6991c640fb9205d880b68603259","status":"affected","lessThan":"c2d9f9a7837ab29ccae0c42252f17d436bf0a501","versionType":"git"},{"version":"d0fe92fb5e3df6991c640fb9205d880b68603259","status":"affected","lessThan":"2e0f6f33f2aa87493b365a38a8fd87b8854b7734","versionType":"git"},{"version":"d0fe92fb5e3df6991c640fb9205d880b68603259","status":"affected","lessThan":"c208b02827eb642758cef65641995fd3f38c89af","versionType":"git"},{"version":"d0fe92fb5e3df6991c640fb9205d880b68603259","status":"affected","lessThan":"f04e2ad394e2755d0bb2d858ecb5598718bf00d5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["tools/bpf/bpftool/net.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.4","versionType":"semver"},{"version":"6.6.55","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.10.14","status":"unaffected","lessThanOrEqual":"6.10.*","versionType":"semver"},{"version":"6.11.3","status":"unaffected","lessThanOrEqual":"6.11.*","versionType":"semver"},{"version":"6.12","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["tools/bpf/bpftool/net.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/c2d9f9a7837ab29ccae0c42252f17d436bf0a501"},{"url":"https://git.kernel.org/stable/c/2e0f6f33f2aa87493b365a38a8fd87b8854b7734"},{"url":"https://git.kernel.org/stable/c/c208b02827eb642758cef65641995fd3f38c89af"},{"url":"https://git.kernel.org/stable/c/f04e2ad394e2755d0bb2d858ecb5598718bf00d5"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T20:43:23.326Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.6.55"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.10.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.11.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.12"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2024-49987","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-10-22T13:31:44.384847Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-10-22T13:38:43.446Z"}}]}}}