CVE-2021-3489
Linux kernel eBPF RINGBUF map oversized allocation
HIGH 7.8
En bref
- Source
- NVD
- EPSS
- EPSS 0.55 % · centile 46 ()
- État
- PUBLISHED
- Publiée
- Mise à jour
- Attribuée par
- canonical
- Statut NVD
- Modified
Description
The eBPF RINGBUF bpf_ringbuf_reserve() function in the Linux kernel did not check that the allocated size was smaller than the ringbuf size, allowing an attacker to perform out-of-bounds writes within the kernel and therefore, arbitrary code execution. This issue was fixed via commit 4b81ccebaeee ("bpf, ringbuf: Deny reserve of buffers larger than ringbuf") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was introduced via 457f44363a88 ("bpf: Implement BPF ring buffer and verifier support for it") (v5.8-rc1).
Faiblesses (CWE)
Références
- https://www.openwall.com/lists/oss-security/2021/05/11/10
- https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=4b81ccebaeee885ab1aa1438133f2991e3a2b6ea
- https://www.zerodayinitiative.com/advisories/ZDI-21-590/
- https://ubuntu.com/security/notices/USN-4950-1
- https://ubuntu.com/security/notices/USN-4949-1
- https://security.netapp.com/advisory/ntap-20210716-0004/
Scores
| Version | Score | Vecteur | Évalué par |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H | canonical |
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H | NVD · security@ubuntu.com (Secondary) |
| 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 · nvd@nist.gov (Primary) |
| CVSS 2.0 | HIGH 7.2 | AV:L/AC:L/Au:N/C:C/I:C/A:C | NVD · nvd@nist.gov (Primary) |
Références européennes
- ENISA EUVD · EUVD-2021-26811
- GCVE · GCVE-0-2021-3489
Avis du CERT-FR
- CERTFR-2021-AVI-864 — Multiples vulnérabilités dans le noyau Linux de Red Hat · cert.ssi.gouv.fr
- CERTFR-2021-AVI-751 — Multiples vulnérabilités dans Google Android · cert.ssi.gouv.fr
- CERTFR-2021-AVI-500 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2021-AVI-469 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2021-AVI-372 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
Configurations affectées (CPE NVD)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.8 < 5.10.37cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.11 < 5.11.21cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.12 < 5.12.4cpe:2.3:o:linux:linux_kernel:5.13:-:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*cpe:2.3:o:canonical:ubuntu_linux:20.10:*:*:*:*:*:*:*cpe:2.3:o:canonical:ubuntu_linux:21.04:*:*:*:*:*:*:*
Produits affectés
| Produit | Versions |
|---|---|
| Linux · Linux kernel | affected trunk < v5.13-rc4 ; affected linux-5.12.y < v5.12.4 ; affected linux-5.11.y < v5.11.21 ; affected linux-5.10.y < v5.10.37 ; affected v5.8 < 5.8* |
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 |