x86/fpu: Stop relying on userspace for info to fault in xsave buffer (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.28 % · percentile 20 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Modified
Description
In the Linux kernel, the following vulnerability has been resolved: x86/fpu: Stop relying on userspace for info to fault in xsave buffer Before this change, the expected size of the user space buffer was taken from fx_sw->xstate_size. fx_sw->xstate_size can be changed from user-space, so it is possible construct a sigreturn frame where: * fx_sw->xstate_size is smaller than the size required by valid bits in fx_sw->xfeatures. * user-space unmaps parts of the sigrame fpu buffer so that not all of the buffer required by xrstor is accessible. In this case, xrstor tries to restore and accesses the unmapped area which results in a fault. But fault_in_readable succeeds because buf + fx_sw->xstate_size is within the still mapped area, so it goes back and tries xrstor again. It will spin in this loop forever. Instead, fault in the maximum size which can be touched by XRSTOR (taken from fpstate->user_size). [ dhansen: tweak subject / changelog ]
Weaknesses (CWE)
- CWE-835 — Loop with Unreachable Exit Condition
References
- https://git.kernel.org/stable/c/8bd3eee7720c14b59a206bd05b98d7586bccf99a
- https://git.kernel.org/stable/c/627339cccdc9166792ecf96bc3c9f711a60ce996
- https://git.kernel.org/stable/c/b2479ab426cef7ab79a13005650eff956223ced2
- https://git.kernel.org/stable/c/627e28cbb65564e55008315d9e02fbb90478beda
- https://git.kernel.org/stable/c/d877550eaf2dc9090d782864c96939397a3c6835
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EZOU3745CWCDZ7EMKMXB2OEEIB5Q3IWM/
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-2024-23865
- GCVE · GCVE-0-2024-26603
CERT-FR advisories
- CERTFR-2025-AVI-1057 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0309 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0213 — Multiples vulnérabilités dans le noyau Linux de Red Hat · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0741 — Multiples vulnérabilités dans Juniper Secure Analytics · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0667 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0646 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0645 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0633 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0611 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0580 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0546 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0471 — Multiples vulnérabilités dans le noyau Linux de Red Hat · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0334 — Multiples vulnérabilités dans le noyau Linux de Debian · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0265 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0242 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.14.0 < 5.15.150cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.16.0 < 6.1.79cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.2.0 < 6.6.18cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.7.0 < 6.7.6
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected fcb3635f5018e53024c6be3c3213737f469f74ff < 8bd3eee7720c14b59a206bd05b98d7586bccf99a ; affected fcb3635f5018e53024c6be3c3213737f469f74ff < 627339cccdc9166792ecf96bc3c9f711a60ce996 ; affected fcb3635f5018e53024c6be3c3213737f469f74ff < b2479ab426cef7ab79a13005650eff956223ced2 ; affected fcb3635f5018e53024c6be3c3213737f469f74ff < 627e28cbb65564e55008315d9e02fbb90478beda ; affected fcb3635f5018e53024c6be3c3213737f469f74ff < d877550eaf2dc9090d782864c96939397a3c6835 |
| Linux · Linux | affected 5.14 ; unaffected 0 < 5.14 ; unaffected 5.15.150 ≤ 5.15.* ; unaffected 6.1.79 ≤ 6.1.* ; unaffected 6.6.18 ≤ 6.6.* ; unaffected 6.7.6 ≤ 6.7.* |
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 |