CVE-2026-31786 - Buffer overflow in drivers/xen/sys-hypervisor.c

CVE-2026-31786 - Buffer overflow in drivers/xen/sys-hypervisor.c

https://cvefeed.io/rssfeed/latest.atom / Thu, 04/30/2026 - 14:21
CVE ID :CVE-2026-31786
Published : April 30, 2026, 11:16 a.m. | 58 minutes ago
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
Severity: 0.0 | NA
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