ext4: validate p_idx bounds in ext4_ext_correct_indexes (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.15 % · percentile 4 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Modified
Description
In the Linux kernel, the following vulnerability has been resolved: ext4: validate p_idx bounds in ext4_ext_correct_indexes ext4_ext_correct_indexes() walks up the extent tree correcting index entries when the first extent in a leaf is modified. Before accessing path[k].p_idx->ei_block, there is no validation that p_idx falls within the valid range of index entries for that level. If the on-disk extent header contains a corrupted or crafted eh_entries value, p_idx can point past the end of the allocated buffer, causing a slab-out-of-bounds read. Fix this by validating path[k].p_idx against EXT_LAST_INDEX() at both access sites: before the while loop and inside it. Return -EFSCORRUPTED if the index pointer is out of range, consistent with how other bounds violations are handled in the ext4 extent tree code.
Weaknesses (CWE)
- CWE-125 — Out-of-bounds Read
References
- https://git.kernel.org/stable/c/39d6e2b67651614bac0dc6592fa9836321910067
- https://git.kernel.org/stable/c/c5839b34704c9c2f47f079451bdbb22de0da1ed1
- https://git.kernel.org/stable/c/10242e640b36b91ad03d25f3dc77854bbdff8358
- https://git.kernel.org/stable/c/4d08401aa13f1531216f1a7ae281ca4806e90a5c
- https://git.kernel.org/stable/c/407c944f217c17d4343148011acafebc604d55e1
- https://git.kernel.org/stable/c/93f2e975ed658ce09db4d4c2877ca2c06540df83
- https://git.kernel.org/stable/c/01bf1e0b997d82c0e353b51ed74ef99698043c33
- https://git.kernel.org/stable/c/2acb5c12ebd860f30e4faf67e6cc8c44ddfe5fe8
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H | Linux |
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H | NVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-24786
- GCVE · GCVE-0-2026-31449
CERT-FR advisories
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1333 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1298 — Multiples vulnérabilités dans les produits Siemens · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1286 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1066 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0954 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0926 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0862 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0697 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0548 — Multiples vulnérabilités dans le noyau Linux de Debian · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 2.6.19.1 < 6.12.80cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.13 < 6.18.21cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.19 < 6.19.11cpe:2.3:o:linux:linux_kernel:2.6.19:-:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:2.6.19:rc2:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:2.6.19:rc3:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:2.6.19:rc4:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:2.6.19:rc5:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:2.6.19:rc6:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected a86c61812637c7dd0c57e29880cffd477b62f2e7 < 39d6e2b67651614bac0dc6592fa9836321910067 ; affected a86c61812637c7dd0c57e29880cffd477b62f2e7 < c5839b34704c9c2f47f079451bdbb22de0da1ed1 ; affected a86c61812637c7dd0c57e29880cffd477b62f2e7 < 10242e640b36b91ad03d25f3dc77854bbdff8358 ; affected a86c61812637c7dd0c57e29880cffd477b62f2e7 < 4d08401aa13f1531216f1a7ae281ca4806e90a5c ; affected a86c61812637c7dd0c57e29880cffd477b62f2e7 < 407c944f217c17d4343148011acafebc604d55e1 ; affected a86c61812637c7dd0c57e29880cffd477b62f2e7 < 93f2e975ed658ce09db4d4c2877ca2c06540df83 |
| Linux · Linux | affected 2.6.19 ; unaffected 0 < 2.6.19 ; unaffected 5.10.259 ≤ 5.10.* ; unaffected 5.15.210 ≤ 5.15.* ; unaffected 6.1.175 ≤ 6.1.* ; unaffected 6.6.140 ≤ 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 |