ipvs: revalidate ihl to prevent out-of-bounds access (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.18 % · percentile 7 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Received
Description
In the Linux kernel, the following vulnerability has been resolved: ipvs: revalidate ihl to prevent out-of-bounds access While the outer IP header is already pulled into the skb head, we must be careful and revalidate the embedded headers after reading them from the skb frags to prevent out-of-bounds access. One such place reported by Sashiko is ip_vs_nat_icmp() where local process can change the ihl field and after skb_ensure_writable() we can see larger value which is a problem for the ip_send_check(cih) calls. Add check to drop the packet if the ihl field is changed.
References
- https://git.kernel.org/stable/c/f55bb94946fb8ee6304590a731c39c1fbc3b28bc
- https://git.kernel.org/stable/c/2512289cbf58706fd558e8fccea4e28003a2af54
- https://git.kernel.org/stable/c/041b2303c8019394735c1f76c5138657bf660a7d
- https://git.kernel.org/stable/c/eb81c8e758f49e04391f77d9470a6232bb5f1c7a
- https://git.kernel.org/stable/c/5365f012451fce2453f13a568dcb72ea534c1e4d
- https://git.kernel.org/stable/c/d93660df4dd1d116f608ada4a29a80a5d6f0a6ed
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | Linux |
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-66577
- GCVE · GCVE-0-2026-74747
CERT-FR advisories
- CERTFR-2026-AVI-1286 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f55bb94946fb8ee6304590a731c39c1fbc3b28bc ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2512289cbf58706fd558e8fccea4e28003a2af54 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 041b2303c8019394735c1f76c5138657bf660a7d ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < eb81c8e758f49e04391f77d9470a6232bb5f1c7a ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5365f012451fce2453f13a568dcb72ea534c1e4d ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d93660df4dd1d116f608ada4a29a80a5d6f0a6ed |
| Linux · Linux | affected 2.6.12 ; unaffected 0 < 2.6.12 ; unaffected 6.1.191 ≤ 6.1.* ; unaffected 6.6.160 ≤ 6.6.* ; unaffected 6.12.114 ≤ 6.12.* ; unaffected 6.18.57 ≤ 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 |