CVE-2024-44963None▾ SunlitIn 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 dea…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 3.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
0.2% → 0.2%
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.
Linux >= fb235dc06fac9eaa4408ade9c8b20d45d63c89b7 < bfcef12f80b3a9bd6b09c7305679164e3307328aLinux >= fb235dc06fac9eaa4408ade9c8b20d45d63c89b7 < 22d907bcd283d69d5e60497fc0d51969545c583bLinux >= fb235dc06fac9eaa4408ade9c8b20d45d63c89b7 < 98251cd60b4d702a8a81de442ab621e83a3fb24fLinux >= fb235dc06fac9eaa4408ade9c8b20d45d63c89b7 < bb3868033a4cccff7be57e9145f2117cbdc91c11Linux 4.11Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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