CVE-2026-89644
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
btrfs: fix extent map leak in NOCOW direct I/O write
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix extent map leak in NOCOW direct I/O write btrfs_dio_iomap_begin() calls btrfs_get_extent(), which returns an extent map reference that must be dropped on all exit paths. For direct writes into a NOCOW range, btrfs_get_blocks_direct_write() keeps using that extent map and asks btrfs_create_dio_extent() to allocate the ordered extent. If that fails, for example because btrfs_alloc_ordered_extent() fails, the function returns the error without dropping the input extent map. The PREALLOC path avoided this by dropping the input extent map before replacing it with the newly created one. Check the error from btrfs_create_dio_extent() before replacing the map and drop the input extent map on failure.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 5f9a8a51d8b95505d8de8b7191ae2ed8c504d4af | affected | git | cb732d302245b14943a5017015fffa8e6db7a6c0 | Unavailable | None listed |
| 5f9a8a51d8b95505d8de8b7191ae2ed8c504d4af | affected | git | b7c873765875645b11503f94c9bae2ca80127375 | Unavailable | None listed |
| 5f9a8a51d8b95505d8de8b7191ae2ed8c504d4af | affected | git | f42efd634c0ae7ba0ce2fc5e30e291b0803b0ae2 | Unavailable | None listed |
| 5f9a8a51d8b95505d8de8b7191ae2ed8c504d4af | affected | git | 05a1a816eef8b3e4332620a64fc8cf45c4eb5c0d | Unavailable | None listed |
| 5f9a8a51d8b95505d8de8b7191ae2ed8c504d4af | affected | git | 3f950867c307c5413d628a153ac44915bd117ffd | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 4.7 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 4.7 | Unavailable | None listed |
| 6.6.160 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.111 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.50 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.2.4 | unaffected | semver | Unavailable | 7.2.* | None listed |
| 7.3 | unaffected | original_commit_for_fix | Unavailable | * | None listed |