ext4: dax: fix overflowing extents beyond inode size when partially writing (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.24 % · percentile 15 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Modified
Description
In the Linux kernel, the following vulnerability has been resolved: ext4: dax: fix overflowing extents beyond inode size when partially writing The dax_iomap_rw() does two things in each iteration: map written blocks and copy user data to blocks. If the process is killed by user(See signal handling in dax_iomap_iter()), the copied data will be returned and added on inode size, which means that the length of written extents may exceed the inode size, then fsck will fail. An example is given as: dd if=/dev/urandom of=file bs=4M count=1 dax_iomap_rw iomap_iter // round 1 ext4_iomap_begin ext4_iomap_alloc // allocate 0~2M extents(written flag) dax_iomap_iter // copy 2M data iomap_iter // round 2 iomap_iter_advance iter->pos += iter->processed // iter->pos = 2M ext4_iomap_begin ext4_iomap_alloc // allocate 2~4M extents(written flag) dax_iomap_iter fatal_signal_pending done = iter->pos - iocb->ki_pos // done = 2M ext4_handle_inode_extension ext4_update_inode_size // inode size = 2M fsck reports: Inode 13, i_size is 2097152, should be 4194304. Fix? Fix the problem by truncating extents if the written length is smaller than expected.
References
- https://git.kernel.org/stable/c/f8a7c342326f6ad1dfdb30a18dd013c70f5e9669
- https://git.kernel.org/stable/c/8c30a9a8610c314554997f86370140746aa35661
- https://git.kernel.org/stable/c/abfaa876b948baaea4d14f21a1963789845c8b4c
- https://git.kernel.org/stable/c/5efccdee4a7d507a483f20f880b809cc4eaef14d
- https://git.kernel.org/stable/c/a9f331f51515bdb3ebc8d0963131af367ef468f6
- https://git.kernel.org/stable/c/ec0dd451e236c46e4858d53e9e82bae7797a7af5
- https://git.kernel.org/stable/c/dda898d7ffe85931f9cca6d702a51f33717c501e
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-355557.html
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2024-45233
- GCVE · GCVE-0-2024-50015
CERT-FR advisories
- CERTFR-2025-AVI-0677 — Multiples vulnérabilités dans les produits Siemens · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0366 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0276 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0185 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0184 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0168 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0152 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0069 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0022 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0002 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2024-AVI-1108 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2024-AVI-1102 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2024-AVI-1101 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0999 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 4.10 < 5.10.227cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.11 < 5.15.168cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.16 < 6.1.113cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.2 < 6.6.55cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.7 < 6.10.14cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.11 < 6.11.3
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 776722e85d3b0936253ecc3d14db4fba37f191ba < f8a7c342326f6ad1dfdb30a18dd013c70f5e9669 ; affected 776722e85d3b0936253ecc3d14db4fba37f191ba < 8c30a9a8610c314554997f86370140746aa35661 ; affected 776722e85d3b0936253ecc3d14db4fba37f191ba < abfaa876b948baaea4d14f21a1963789845c8b4c ; affected 776722e85d3b0936253ecc3d14db4fba37f191ba < 5efccdee4a7d507a483f20f880b809cc4eaef14d ; affected 776722e85d3b0936253ecc3d14db4fba37f191ba < a9f331f51515bdb3ebc8d0963131af367ef468f6 ; affected 776722e85d3b0936253ecc3d14db4fba37f191ba < ec0dd451e236c46e4858d53e9e82bae7797a7af5 |
| Linux · Linux | affected 4.10 ; unaffected 0 < 4.10 ; unaffected 5.10.227 ≤ 5.10.* ; unaffected 5.15.168 ≤ 5.15.* ; unaffected 6.1.113 ≤ 6.1.* ; unaffected 6.6.55 ≤ 6.6.* |
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 |