fs/jfs: Prevent integer overflow in AG size calculation (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.31 % · percentile 24 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Analyzed
Description
In the Linux kernel, the following vulnerability has been resolved: fs/jfs: Prevent integer overflow in AG size calculation The JFS filesystem calculates allocation group (AG) size using 1 << l2agsize in dbExtendFS(). When l2agsize exceeds 31 (possible with >2TB aggregates on 32-bit systems), this 32-bit shift operation causes undefined behavior and improper AG sizing. On 32-bit architectures: - Left-shifting 1 by 32+ bits results in 0 due to integer overflow - This creates invalid AG sizes (0 or garbage values) in sbi->bmap->db_agsize - Subsequent block allocations would reference invalid AG structures - Could lead to: - Filesystem corruption during extend operations - Kernel crashes due to invalid memory accesses - Security vulnerabilities via malformed on-disk structures Fix by casting to s64 before shifting: bmp->db_agsize = (s64)1 << l2agsize; This ensures 64-bit arithmetic even on 32-bit architectures. The cast matches the data type of db_agsize (s64) and follows similar patterns in JFS block calculation code. Found by Linux Verification Center (linuxtesting.org) with SVACE.
Weaknesses (CWE)
- CWE-190 — Integer Overflow or Wraparound
References
- https://git.kernel.org/stable/c/dd07a985e2ded47b6c7d69fc93c1fe02977c8454
- https://git.kernel.org/stable/c/8bb29629a5e4090e1ef7199cb42db04a52802239
- https://git.kernel.org/stable/c/3d8a45f87010a802aa214bf39702ca9d99cbf3ba
- https://git.kernel.org/stable/c/55edbf5dbf60a8195c21e92124c4028939ae16b2
- https://git.kernel.org/stable/c/7ccf3b35274512b60ecb614e0637e76bd6f2d829
- https://git.kernel.org/stable/c/c802a6a4009f585111f903e810b3be9c6d0da329
- https://git.kernel.org/stable/c/211ed8f5e39e61f9e4d18edd64ce8005a67a1b2a
- https://git.kernel.org/stable/c/ec34cdf4f917cc6abd306cf091f8b8361fedac88
- https://git.kernel.org/stable/c/7fcbf789629cdb9fbf4e2172ce31136cfed11e5e
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.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-2025-14134
- GCVE · GCVE-0-2025-37858
CERT-FR advisories
- CERTFR-2026-AVI-0246 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0227 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0218 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0194 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0169 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0758 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0756 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0743 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0723 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0670 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0650 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0625 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0607 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0589 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0587 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0559 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0529 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0463 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*< 5.4.293cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.5 < 5.10.237cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.11 < 5.15.181cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.16 < 6.1.135cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.2 < 6.6.88cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.7 < 6.12.24cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.13 < 6.13.12cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.14 < 6.14.3cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < dd07a985e2ded47b6c7d69fc93c1fe02977c8454 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8bb29629a5e4090e1ef7199cb42db04a52802239 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3d8a45f87010a802aa214bf39702ca9d99cbf3ba ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 55edbf5dbf60a8195c21e92124c4028939ae16b2 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7ccf3b35274512b60ecb614e0637e76bd6f2d829 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c802a6a4009f585111f903e810b3be9c6d0da329 |
| Linux · Linux | affected 2.6.12 ; unaffected 0 < 2.6.12 ; unaffected 5.4.293 ≤ 5.4.* ; unaffected 5.10.237 ≤ 5.10.* ; unaffected 5.15.181 ≤ 5.15.* ; unaffected 6.1.135 ≤ 6.1.* |
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 |