CVE-2024-44963

btrfs: do not BUG_ON() when freeing tree block after error

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: do not BUG_ON() when freeing tree block after error When freeing a tree block, at btrfs_free_tree_block(), if we fail to create a delayed reference we don't deal with the error and just do a BUG_ON(). The error most likely to happen is -ENOMEM, and we have a comment mentioning that only -ENOMEM can happen, but that is not true, because in case qgroups are enabled any error returned from btrfs_qgroup_trace_extent_post() (can be -EUCLEAN or anything returned from btrfs_search_slot() for example) can be propagated back to btrfs_free_tree_block(). So stop doing a BUG_ON() and return the error to the callers and make them abort the transaction to prevent leaking space. Syzbot was triggering this, likely due to memory allocation failure injection.

5.5

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.04%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/22d907bcd283d69d5e60497fc0d51969545c583b
https://git.kernel.org/stable/c/98251cd60b4d702a8a81de442ab621e83a3fb24f	patch
https://git.kernel.org/stable/c/bb3868033a4cccff7be57e9145f2117cbdc91c11	patch

Frequently Asked Questions

What is the severity of CVE-2024-44963?: CVE-2024-44963 has been scored as a medium severity vulnerability.
How to fix CVE-2024-44963?: To fix CVE-2024-44963, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-44963 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2024-44963 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-44963?: CVE-2024-44963 affects Linux Linux, Linux Linux.

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