# CVE-2024-50063: linux: In the Linux kernel, the following vulnerability has been resolved: bpf: Prevent tail call between progs attached to... CVE-2024-50063 is fixed in 48 products on 1 platform, first by DEBIAN-CVE-2024-50063, released October 21, 2024. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2024-50063 - Priority: High - CVSS: 7.8 (high) - EPSS: 0.0023 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Oct 21, 2024 ## Description In the Linux kernel, the following vulnerability has been resolved: bpf: Prevent tail call between progs attached to different hooks bpf progs can be attached to kernel functions, and the attached functions can take different parameters or return different return values. If prog attached to one kernel function tail calls prog attached to another kernel function, the ctx access or return value verification could be bypassed. For example, if prog1 is attached to func1 which takes only 1 parameter and prog2 is attached to func2 which takes two parameters. Since verifier assumes the bpf ctx passed to prog2 is constructed based on func2's prototype, verifier allows prog2 to access the second parameter from the bpf ctx passed to it. The problem is that verifier does not prevent prog1 from passing its bpf ctx to prog2 via tail call. In this case, the bpf ctx passed to prog2 is constructed from func1 instead of func2, that is, the assumption for ctx access verification is bypassed. Another example, if BPF LSM prog1 is attached to hook file_alloc_security, and BPF LSM prog2 is attached to hook bpf_lsm_audit_rule_known. Verifier knows the return value rules for these two hooks, e.g. it is legal for bpf_lsm_audit_rule_known to return positive number 1, and it is illegal for file_alloc_security to return positive number. So verifier allows prog2 to return positive number 1, but does not allow prog1 to return positive number. The problem is that verifier does not prevent prog1 from calling prog2 via tail call. In this case, prog2's return value 1 will be used as the return value for prog1's hook file_alloc_security. That is, the return value rule is bypassed. This patch adds restriction for tail call to prevent such bypasses. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool amzn 2023 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 2025 | | Linux | bpftool-debuginfo amzn 2023 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 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 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 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 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 2025 | | Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 2025 | | Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 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 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 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 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 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 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 2025 | | Linux | kernel-libbpf-debuginfo amzn 2023 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 2025 | | Linux | kernel-libbpf-devel amzn 2023 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 2025 | | Linux | kernel-libbpf-static amzn 2023 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 2025 | | Linux | kernel-livepatch-6.1.140-154.222 amzn 2023 | 1.0-0.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 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 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 2025 | | Linux | kernel-modules-extra-common amzn 2023 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 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 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 2025 | | Linux | kernel-tools-debuginfo amzn 2023 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 2025 | | Linux | kernel-tools-devel amzn 2023 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 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) | 6.1.135-1 | [DEBIAN-CVE-2024-50063](https://patchblox.com/security/data/fix/linux/debian-cve-2024-50063.md) | Oct 21, 2024 | | Linux | linux Debian 13.5 (trixie) | 6.11.4-1 | [DEBIAN-CVE-2024-50063](https://patchblox.com/security/data/fix/linux/debian-cve-2024-50063.md) | Oct 21, 2024 | | Linux | linux Debian 14 | 6.11.4-1 | [DEBIAN-CVE-2024-50063](https://patchblox.com/security/data/fix/linux/debian-cve-2024-50063.md) | Oct 21, 2024 | | Linux | perf amzn 2023 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 2025 | | Linux | perf-debuginfo amzn 2023 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 2025 | | Linux | python3-perf amzn 2023 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 2025 | | Linux | python3-perf-debuginfo amzn 2023 | 6.1.140-154.222.amzn2023 | [ALAS2023-2025-1050](https://patchblox.com/security/data/fix/linux/alas2023-2025-1050.md) | Jun 26, 2025 | --- Data as of 2026-11-08T19:12:23Z UTC. 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