Buffer overflow in drivers/xen/sys-hypervisor.c (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.20 % · percentile 9 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Modified
Description
In the Linux kernel, the following vulnerability has been resolved: Buffer overflow in drivers/xen/sys-hypervisor.c The build id returned by HYPERVISOR_xen_version(XENVER_build_id) is neither NUL terminated nor a string. The first causes a buffer overflow as sprintf in buildid_show will read and copy till it finds a NUL. 00000000 f4 91 51 f4 dd 38 9e 9d 65 47 52 eb 10 71 db 50 |..Q..8..eGR..q.P| 00000010 b9 a8 01 42 6f 2e 32 |...Bo.2| 00000017 So use a memcpy instead of sprintf to have the correct value: 00000000 f4 91 51 f4 dd 00 9e 9d 65 47 52 eb 10 71 db 50 |..Q.....eGR..q.P| 00000010 b9 a8 01 42 |...B| 00000014 (the above have a hack to embed a zero inside and check it's returned correctly). This is XSA-485 / CVE-2026-31786
Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/e3af585e1728c917682b6a3de9a69b41fb9194d4
- https://git.kernel.org/stable/c/8288d031a01dbacfde3fc643f7be3d23504de64d
- https://git.kernel.org/stable/c/f458ba102da97fafca106327086fc95f3fc764cb
- https://git.kernel.org/stable/c/4b4defd2fce3f966c25adabf46644a85558f1169
- https://git.kernel.org/stable/c/5c5ff7c7bd15bb536f44b10b3fb5b8408f344d0a
- https://git.kernel.org/stable/c/d5f59216650c51e5e3fcb7517c825bc8047f60ef
- https://git.kernel.org/stable/c/52cecff98bda2c51eed1c6ce9d21c5d6268fb19d
- https://git.kernel.org/stable/c/27fdbab4221b375de54bf91919798d88520c6e28
- http://www.openwall.com/lists/oss-security/2026/04/28/12
- http://xenbits.xen.org/xsa/advisory-485.html
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-2026-26364
- GCVE · GCVE-0-2026-31786
CERT-FR advisories
- CERTFR-2026-AVI-0986 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0808 — Multiples vulnérabilités dans le noyau Linux de Red Hat · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0781 — Multiples vulnérabilités dans le noyau Linux de Red Hat · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0696 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0548 — Multiples vulnérabilités dans le noyau Linux de Debian · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0547 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0509 — Multiples vulnérabilités dans Xen · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 4.13 < 5.10.254cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.11 < 5.15.204cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.16 < 6.1.170cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.2 < 6.6.137cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.7 < 6.12.85cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.13 < 6.18.26cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.19 < 7.0.3cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 84b7625728ea311ea35bdaa0eded53c1c56baeaa < e3af585e1728c917682b6a3de9a69b41fb9194d4 ; affected 84b7625728ea311ea35bdaa0eded53c1c56baeaa < 8288d031a01dbacfde3fc643f7be3d23504de64d ; affected 84b7625728ea311ea35bdaa0eded53c1c56baeaa < f458ba102da97fafca106327086fc95f3fc764cb ; affected 84b7625728ea311ea35bdaa0eded53c1c56baeaa < 4b4defd2fce3f966c25adabf46644a85558f1169 ; affected 84b7625728ea311ea35bdaa0eded53c1c56baeaa < 5c5ff7c7bd15bb536f44b10b3fb5b8408f344d0a ; affected 84b7625728ea311ea35bdaa0eded53c1c56baeaa < d5f59216650c51e5e3fcb7517c825bc8047f60ef |
| Linux · Linux | affected 4.13 ; unaffected 0 < 4.13 ; unaffected 5.10.254 ≤ 5.10.* ; unaffected 5.15.204 ≤ 5.15.* ; unaffected 6.1.170 ≤ 6.1.* ; unaffected 6.6.137 ≤ 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 |