rseq: Fix segfault on registration when rseq_cs is non-zero (Linux Linux)
En bref
- Source
- NVD
- EPSS
- EPSS 0.58 % · centile 48 ()
- État
- PUBLISHED
- Publiée
- Mise à jour
- Attribuée par
- Linux
- Statut NVD
- Modified
Description
In the Linux kernel, the following vulnerability has been resolved: rseq: Fix segfault on registration when rseq_cs is non-zero The rseq_cs field is documented as being set to 0 by user-space prior to registration, however this is not currently enforced by the kernel. This can result in a segfault on return to user-space if the value stored in the rseq_cs field doesn't point to a valid struct rseq_cs. The correct solution to this would be to fail the rseq registration when the rseq_cs field is non-zero. However, some older versions of glibc will reuse the rseq area of previous threads without clearing the rseq_cs field and will also terminate the process if the rseq registration fails in a secondary thread. This wasn't caught in testing because in this case the leftover rseq_cs does point to a valid struct rseq_cs. What we can do is clear the rseq_cs field on registration when it's non-zero which will prevent segfaults on registration and won't break the glibc versions that reuse rseq areas on thread creation.
Références
- https://git.kernel.org/stable/c/48900d839a3454050fd5822e34be8d54c4ec9b86
- https://git.kernel.org/stable/c/3e4028ef31b69286c9d4878cee0330235f53f218
- https://git.kernel.org/stable/c/b2b05d0dc2f4f0646922068af435aed5763d16ba
- https://git.kernel.org/stable/c/eaf112069a904b6207b4106ff083e0208232a2eb
- https://git.kernel.org/stable/c/f004f58d18a2d3dc761cf973ad27b4a5997bd876
- https://git.kernel.org/stable/c/2df285dab00fa03a3ef939b6cb0d0d0aeb0791db
- https://git.kernel.org/stable/c/fd881d0a085fc54354414aed990ccf05f282ba53
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
Scores
| Version | Score | Vecteur | Évalué par |
|---|---|---|---|
| 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) |
Références européennes
- ENISA EUVD · EUVD-2025-18586
- GCVE · GCVE-0-2025-38067
Avis du CERT-FR
- 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-1054 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0969 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0894 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0859 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0843 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0828 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0698 — Multiples vulnérabilités dans le noyau Linux de Debian · cert.ssi.gouv.fr
Configurations affectées (CPE NVD)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 4.18 < 5.10.240cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.11 < 5.15.189cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.16 < 6.1.146cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.2 < 6.6.99cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.7 < 6.12.39cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.13 < 6.14.9cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
Produits affectés
| Produit | Versions |
|---|---|
| Linux · Linux | affected d7822b1e24f2df5df98c76f0e94a5416349ff759 < 48900d839a3454050fd5822e34be8d54c4ec9b86 ; affected d7822b1e24f2df5df98c76f0e94a5416349ff759 < 3e4028ef31b69286c9d4878cee0330235f53f218 ; affected d7822b1e24f2df5df98c76f0e94a5416349ff759 < b2b05d0dc2f4f0646922068af435aed5763d16ba ; affected d7822b1e24f2df5df98c76f0e94a5416349ff759 < eaf112069a904b6207b4106ff083e0208232a2eb ; affected d7822b1e24f2df5df98c76f0e94a5416349ff759 < f004f58d18a2d3dc761cf973ad27b4a5997bd876 ; affected d7822b1e24f2df5df98c76f0e94a5416349ff759 < 2df285dab00fa03a3ef939b6cb0d0d0aeb0791db |
| Linux · Linux | affected 4.18 ; unaffected 0 < 4.18 ; unaffected 5.10.240 ≤ 5.10.* ; unaffected 5.15.189 ≤ 5.15.* ; unaffected 6.1.146 ≤ 6.1.* ; unaffected 6.6.99 ≤ 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 |