btrfs: fix extent map leak in NOCOW direct I/O write (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.17 % · percentile 7 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Received
Description
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.
References
- https://git.kernel.org/stable/c/8d264d35df981e943171ddc09cd6cc1d38c65e17
- https://git.kernel.org/stable/c/cb732d302245b14943a5017015fffa8e6db7a6c0
- https://git.kernel.org/stable/c/b7c873765875645b11503f94c9bae2ca80127375
- https://git.kernel.org/stable/c/f42efd634c0ae7ba0ce2fc5e30e291b0803b0ae2
- https://git.kernel.org/stable/c/05a1a816eef8b3e4332620a64fc8cf45c4eb5c0d
- https://git.kernel.org/stable/c/3f950867c307c5413d628a153ac44915bd117ffd
European references
- ENISA EUVD · EUVD-2026-76556
- GCVE · GCVE-0-2026-89644
CERT-FR advisories
- CERTFR-2026-AVI-1372 — Multiples vulnérabilités dans les produits SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1335 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1289 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1253 — Multiples vulnérabilités dans le noyau Linux de Debian · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 5f9a8a51d8b95505d8de8b7191ae2ed8c504d4af < 8d264d35df981e943171ddc09cd6cc1d38c65e17 ; affected 5f9a8a51d8b95505d8de8b7191ae2ed8c504d4af < cb732d302245b14943a5017015fffa8e6db7a6c0 ; affected 5f9a8a51d8b95505d8de8b7191ae2ed8c504d4af < b7c873765875645b11503f94c9bae2ca80127375 ; affected 5f9a8a51d8b95505d8de8b7191ae2ed8c504d4af < f42efd634c0ae7ba0ce2fc5e30e291b0803b0ae2 ; affected 5f9a8a51d8b95505d8de8b7191ae2ed8c504d4af < 05a1a816eef8b3e4332620a64fc8cf45c4eb5c0d ; affected 5f9a8a51d8b95505d8de8b7191ae2ed8c504d4af < 3f950867c307c5413d628a153ac44915bd117ffd |
| Linux · Linux | affected 4.7 ; unaffected 0 < 4.7 ; unaffected 6.1.191 ≤ 6.1.* ; unaffected 6.6.160 ≤ 6.6.* ; unaffected 6.12.111 ≤ 6.12.* ; unaffected 6.18.50 ≤ 6.18.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |