Answer in brief
CVE-2024-44963 records a Medium severity (CVSS 5.5) vulnerability in btrfs: do not BUG_ON() when freeing tree block after error. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=fb235dc06fac9eaa4408ade9c8b20d45d63c89b7 <bfcef12f80b3a9bd6b09c7305679164e3307328a || >=fb235dc06fac9eaa4408ade9c8b20d45d63c89b7 <22d907bcd283d69d5e60497fc0d51969545c583b || >=fb235dc06fac9eaa4408ade9c8b20d45d63c89b7 <98251cd60b4d702a8a81de442ab621e83a3fb24f || >=fb235dc06fac9eaa4408ade9c8b20d45d63c89b7 <bb3868033a4cccff7be57e9145f2117cbdc91c11 | bfcef12f80b3a9bd6b09c7305679164e3307328a, 22d907bcd283d69d5e60497fc0d51969545c583b, 98251cd60b4d702a8a81de442ab621e83a3fb24f, bb3868033a4cccff7be57e9145f2117cbdc91c11 |
| Linux/Linuxgeneric | 4.11 | Not reported |
Published upstream
Sep 4, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 30, 2026
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.
Quoted source text, attributed separately from HOL analysis.