# CVE-2024-49987: bpftool: Fix undefined behavior in qsort(NULL 0 ...) CVE-2024-49987 is fixed in 27 products on 1 platform, first by DEBIAN-CVE-2024-49987, released October 21, 2024. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2024-49987 - Priority: Routine - CVSS: 5.5 (Moderate) - EPSS: 0.0024 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Oct 21, 2024 - Weakness: NULL Pointer Dereference - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-49987 ## 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool opensuse-leap 15.6 | 6.4.0-150600.19.6.1 | [SUSE-SU-2024:4157-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4157-1.md) | Dec 3, 2024 | | Linux | bpftool sles 15.6 | 6.4.0-150600.19.6.1 | [SUSE-SU-2024:4157-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4157-1.md) | Dec 3, 2024 | | Linux | dtb-aarch64 opensuse-leap 15.6 | 6.4.0-150600.23.30.1 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-64kb opensuse-leap 15.6 | 6.4.0-150600.23.30.1 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-64kb sles 15.6 | 6.4.0-150600.23.30.1 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-azure opensuse-leap 15.6 | 6.4.0-150600.8.20.1 | [SUSE-SU-2024:4316-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4316-1.md) | Dec 13, 2024 | | Linux | kernel-azure sles 15.6 | 6.4.0-150600.8.20.1 | [SUSE-SU-2024:4316-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4316-1.md) | Dec 13, 2024 | | Linux | kernel-coco sles 15.6 | 6.4.0-15061.9.coco15sp6.1 | [SUSE-SU-2024:4387-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4387-1.md) | Dec 19, 2024 | | Linux | kernel-coco_debug sles 15.6 | 6.4.0-15061.9.coco15sp6.1 | [SUSE-SU-2024:4387-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4387-1.md) | Dec 19, 2024 | | Linux | kernel-debug opensuse-leap 15.6 | 6.4.0-150600.23.30.1 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-default opensuse-leap 15.6 | 6.4.0-150600.23.30.1 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-default sles 15.6 | 6.4.0-150600.23.30.1 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-default-base opensuse-leap 15.6 | 6.4.0-150600.23.30.1.150600.12.12.6 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-default-base sles 15.6 | 6.4.0-150600.23.30.1.150600.12.12.6 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-docs opensuse-leap 15.6 | 6.4.0-150600.23.30.1 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-docs sles 15.6 | 6.4.0-150600.23.30.1 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-kvmsmall opensuse-leap 15.6 | 6.4.0-150600.23.30.1 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-livepatch-SLE15-SP6-RT_Update_6 sles 15.6 | 1-150600.1.3.1 | [SUSE-SU-2024:4314-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4314-1.md) | Dec 13, 2024 | | Linux | kernel-livepatch-SLE15-SP6_Update_6 sles 15.6 | 1-150600.13.3.5 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-obs-build opensuse-leap 15.6 | 6.4.0-150600.23.30.1 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-obs-build sles 15.6 | 6.4.0-150600.23.30.1 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-obs-qa opensuse-leap 15.6 | 6.4.0-150600.23.30.1 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-rt opensuse-leap 15.6 | 6.4.0-150600.10.20.1 | [SUSE-SU-2024:4314-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4314-1.md) | Dec 13, 2024 | | Linux | kernel-rt_debug opensuse-leap 15.6 | 6.4.0-150600.10.20.1 | [SUSE-SU-2024:4314-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4314-1.md) | Dec 13, 2024 | | Linux | kernel-source opensuse-leap 15.6 | 6.4.0-150600.23.30.1 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-source sles 15.6 | 6.4.0-150600.23.30.1 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-source-azure opensuse-leap 15.6 | 6.4.0-150600.8.20.1 | [SUSE-SU-2024:4316-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4316-1.md) | Dec 13, 2024 | | Linux | kernel-source-azure sles 15.6 | 6.4.0-150600.8.20.1 | [SUSE-SU-2024:4316-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4316-1.md) | Dec 13, 2024 | | Linux | kernel-source-coco sles 15.6 | 6.4.0-15061.9.coco15sp6.1 | [SUSE-SU-2024:4387-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4387-1.md) | Dec 19, 2024 | | Linux | kernel-source-rt opensuse-leap 15.6 | 6.4.0-150600.10.20.1 | [SUSE-SU-2024:4314-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4314-1.md) | Dec 13, 2024 | | Linux | kernel-syms opensuse-leap 15.6 | 6.4.0-150600.23.30.1 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-syms sles 15.6 | 6.4.0-150600.23.30.1 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-syms-azure opensuse-leap 15.6 | 6.4.0-150600.8.20.1 | [SUSE-SU-2024:4316-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4316-1.md) | Dec 13, 2024 | | Linux | kernel-syms-azure sles 15.6 | 6.4.0-150600.8.20.1 | [SUSE-SU-2024:4316-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4316-1.md) | Dec 13, 2024 | | Linux | kernel-syms-coco sles 15.6 | 6.4.0-15061.9.coco15sp6.1 | [SUSE-SU-2024:4387-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4387-1.md) | Dec 19, 2024 | | Linux | kernel-syms-rt opensuse-leap 15.6 | 6.4.0-150600.10.20.1 | [SUSE-SU-2024:4314-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4314-1.md) | Dec 13, 2024 | | Linux | kernel-zfcpdump opensuse-leap 15.6 | 6.4.0-150600.23.30.1 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | kernel-zfcpdump sles 15.6 | 6.4.0-150600.23.30.1 | [SUSE-SU-2024:4318-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4318-1.md) | Dec 13, 2024 | | Linux | linux Debian 13.5 (trixie) | 6.11.4-1 | [DEBIAN-CVE-2024-49987](https://patchblox.com/security/data/fix/linux/debian-cve-2024-49987.md) | Oct 21, 2024 | | Linux | linux Debian 14 | 6.11.4-1 | [DEBIAN-CVE-2024-49987](https://patchblox.com/security/data/fix/linux/debian-cve-2024-49987.md) | Oct 21, 2024 | --- Data as of 2026-11-08T13:06:02Z UTC. 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