# CVE-2024-47728: bpf: Zero former ARG_PTR_TO_{LONGINT} args in case of error

CVE-2024-47728 is fixed in 47 products on 1 platform, first by DEBIAN-CVE-2024-47728, released October 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-47728
- 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: Incomplete Cleanup
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-47728

## Description

In the Linux kernel, the following vulnerability has been resolved:  bpf: Zero former ARG_PTR_TO_{LONG,INT} args in case of error  For all non-tracing helpers which formerly had ARG_PTR_TO_{LONG,INT} as input arguments, zero the value for the case of an error as otherwise it could leak memory. For tracing, it is not needed given CAP_PERFMON can already read all kernel memory anyway hence bpf_get_func_arg() and bpf_get_func_ret() is skipped in here.  Also, the MTU helpers mtu_len pointer value is being written but also read. Technically, the MEM_UNINIT should not be there in order to always force init. Removing MEM_UNINIT needs more verifier rework though: MEM_UNINIT right now implies two things actually: i) write into memory, ii) memory does not have to be initialized. If we lift MEM_UNINIT, it then becomes: i) read into memory, ii) memory must be initialized. This means that for bpf_*_check_mtu() we're readding the issue we're trying to fix, that is, it would then be able to write back into things like .rodata BPF maps. Follow-up work will rework the MEM_UNINIT semantics such that the intent can be better expressed. For now just clear the *mtu_len on error path which can be lifted later again.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| Linux | bpftool-debuginfo amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| 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 amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| 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 | 6.4.0-150600.8.17.2 | [SUSE-SU-2024:3984-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3984-1.md) | Nov 13, 2024 |
| Linux | kernel-azure sles 15.6 | 6.4.0-150600.8.17.2 | [SUSE-SU-2024:3984-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3984-1.md) | Nov 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-debuginfo amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| 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-devel amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| 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-headers amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| 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-libbpf amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| Linux | kernel-libbpf-devel amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| Linux | kernel-libbpf-static amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| Linux | kernel-livepatch-6.1.115-126.197 amzn 2023 | 1.0-0.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| Linux | kernel-livepatch-SLE15-SP6-RT_Update_5 sles 15.6 | 1-150600.1.3.1 | [SUSE-SU-2024:3986-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3986-1.md) | Nov 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-modules-extra amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| Linux | kernel-modules-extra-common amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| 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 | 6.4.0-150600.10.17.1 | [SUSE-SU-2024:3986-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3986-1.md) | Nov 13, 2024 |
| Linux | kernel-rt_debug opensuse-leap 15.6 | 6.4.0-150600.10.17.1 | [SUSE-SU-2024:3986-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3986-1.md) | Nov 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 | 6.4.0-150600.8.17.1 | [SUSE-SU-2024:3984-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3984-1.md) | Nov 13, 2024 |
| Linux | kernel-source-azure sles 15.6 | 6.4.0-150600.8.17.1 | [SUSE-SU-2024:3984-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3984-1.md) | Nov 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 | 6.4.0-150600.10.17.1 | [SUSE-SU-2024:3986-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3986-1.md) | Nov 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 | 6.4.0-150600.8.17.1 | [SUSE-SU-2024:3984-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3984-1.md) | Nov 13, 2024 |
| Linux | kernel-syms-azure sles 15.6 | 6.4.0-150600.8.17.1 | [SUSE-SU-2024:3984-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3984-1.md) | Nov 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 | 6.4.0-150600.10.17.1 | [SUSE-SU-2024:3986-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3986-1.md) | Nov 13, 2024 |
| Linux | kernel-tools amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| Linux | kernel-tools-debuginfo amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| Linux | kernel-tools-devel amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| 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 12.15 (bookworm) | 6.1.115-1 | [DEBIAN-CVE-2024-47728](https://patchblox.com/security/data/fix/linux/debian-cve-2024-47728.md) | Oct 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.11.2-1 | [DEBIAN-CVE-2024-47728](https://patchblox.com/security/data/fix/linux/debian-cve-2024-47728.md) | Oct 21, 2024 |
| Linux | linux Debian 14 | 6.11.2-1 | [DEBIAN-CVE-2024-47728](https://patchblox.com/security/data/fix/linux/debian-cve-2024-47728.md) | Oct 21, 2024 |
| Linux | perf amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| Linux | perf-debuginfo amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| Linux | python3-perf amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |
| Linux | python3-perf-debuginfo amzn 2023 | 6.1.115-126.197.amzn2023 | [ALAS2023-2025-794](https://patchblox.com/security/data/fix/linux/alas2023-2025-794.md) | Jan 6, 2025 |

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