DEBIAN-CVE-2026-31786
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
Risk Scores
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Debian:11 | linux-6.1 | 6.1.162-1, 6.1.159-1, 6.1.158-1 |
| Debian:13 | linux | 6.12.74-2, 6.12.74-2~bpo12+1, 6.12.74-1 |
| Debian:12 | linux | 6.4.4-3, 6.1.106-3, 6.12.48-1 |
| Debian:11 | linux | 6.12.85-1, 6.11.10-1, 6.11.2-1 |
| Debian:14 | linux | 7.0.1-1, 7.0-1, 6.19 |
Timeline
- Apr 28, 2026 CVE Published
- May 9, 2026 CVE Updated