# CVE-2024-50273: linux: In the Linux kernel, the following vulnerability has been resolved:  btrfs: reinitialize delayed ref list after delet...

CVE-2024-50273 is fixed in 61 products on 1 platform, first by DEBIAN-CVE-2024-50273, released November 19, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-50273
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0029
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 19, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  btrfs: reinitialize delayed ref list after deleting it from the list  At insert_delayed_ref() if we need to update the action of an existing ref to BTRFS_DROP_DELAYED_REF, we delete the ref from its ref head's ref_add_list using list_del(), which leaves the ref's add_list member not reinitialized, as list_del() sets the next and prev members of the list to LIST_POISON1 and LIST_POISON2, respectively.  If later we end up calling drop_delayed_ref() against the ref, which can happen during merging or when destroying delayed refs due to a transaction abort, we can trigger a crash since at drop_delayed_ref() we call list_empty() against the ref's add_list, which returns false since the list was not reinitialized after the list_del() and as a consequence we call list_del() again at drop_delayed_ref(). This results in an invalid list access since the next and prev members are set to poison pointers, resulting in a splat if CONFIG_LIST_HARDENED and CONFIG_DEBUG_LIST are set or invalid poison pointer dereferences otherwise.  So fix this by deleting from the list with list_del_init() instead.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool amzn 2023 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 2025 |
| Linux | bpftool ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | bpftool ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | bpftool-debuginfo amzn 2023 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 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 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 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 | 6.4.0-150600.8.20.1 | [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-debuginfo amzn 2023 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 2025 |
| Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 2025 |
| Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 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 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 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 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 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 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 2025 |
| Linux | kernel-libbpf-devel amzn 2023 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 2025 |
| Linux | kernel-libbpf-static amzn 2023 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 2025 |
| Linux | kernel-livepatch-6.1.119-129.201 amzn 2023 | 1.0-0.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 2025 |
| 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-modules-extra amzn 2023 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 2025 |
| Linux | kernel-modules-extra-common amzn 2023 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 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 | 6.4.0-150600.10.20.1 | [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-tools amzn 2023 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 2025 |
| Linux | kernel-tools-debuginfo amzn 2023 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 2025 |
| Linux | kernel-tools-devel amzn 2023 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 2025 |
| Linux | kernel-uek ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-container ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-container ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-container-debug ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-container-debug ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-core ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-core ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug-core ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug-core ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug-devel ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug-devel ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug-modules ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug-modules ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug-modules-extra ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-debug-modules-extra ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-devel ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-devel ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-doc ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-doc ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-modules ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-modules ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-modules-extra ol 8 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-modules-extra ol 9 | 0:5.15.0-305.176.4.el9uek | [ELSA-2025-20095](https://patchblox.com/security/data/fix/linux/elsa-2025-20095.md) | Feb 9, 2025 |
| Linux | kernel-uek-tools ol 8 | 0:5.4.17-2136.340.4.1.el7uek | [ELSA-2025-20100](https://patchblox.com/security/data/fix/linux/elsa-2025-20100.md) | Feb 12, 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) | 6.1.119-1 | [DEBIAN-CVE-2024-50273](https://patchblox.com/security/data/fix/linux/debian-cve-2024-50273.md) | Nov 19, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.11.9-1 | [DEBIAN-CVE-2024-50273](https://patchblox.com/security/data/fix/linux/debian-cve-2024-50273.md) | Nov 19, 2024 |
| Linux | linux Debian 14 | 6.11.9-1 | [DEBIAN-CVE-2024-50273](https://patchblox.com/security/data/fix/linux/debian-cve-2024-50273.md) | Nov 19, 2024 |
| Linux | perf amzn 2023 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 2025 |
| Linux | perf-debuginfo amzn 2023 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 2025 |
| Linux | python3-perf amzn 2023 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 2025 |
| Linux | python3-perf-debuginfo amzn 2023 | 6.1.119-129.201.amzn2023 | [ALAS2023-2025-802](https://patchblox.com/security/data/fix/linux/alas2023-2025-802.md) | Jan 16, 2025 |

---

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