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
References
Configurations
Configuration 1 (hide)
|
History
06 May 2026, 19:44
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Linux
Linux linux Kernel |
|
| CWE | CWE-787 | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* |
|
| References | () https://git.kernel.org/stable/c/27fdbab4221b375de54bf91919798d88520c6e28 - Patch | |
| References | () https://git.kernel.org/stable/c/4b4defd2fce3f966c25adabf46644a85558f1169 - Patch | |
| References | () https://git.kernel.org/stable/c/52cecff98bda2c51eed1c6ce9d21c5d6268fb19d - Patch | |
| References | () https://git.kernel.org/stable/c/5c5ff7c7bd15bb536f44b10b3fb5b8408f344d0a - Patch | |
| References | () https://git.kernel.org/stable/c/8288d031a01dbacfde3fc643f7be3d23504de64d - Patch | |
| References | () https://git.kernel.org/stable/c/d5f59216650c51e5e3fcb7517c825bc8047f60ef - Patch | |
| References | () https://git.kernel.org/stable/c/e3af585e1728c917682b6a3de9a69b41fb9194d4 - Patch | |
| References | () https://git.kernel.org/stable/c/f458ba102da97fafca106327086fc95f3fc764cb - Patch | |
| References | () http://www.openwall.com/lists/oss-security/2026/04/28/12 - Mailing List, Third Party Advisory | |
| References | () http://xenbits.xen.org/xsa/advisory-485.html - Mailing List, Third Party Advisory |
04 May 2026, 09:16
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
03 May 2026, 07:16
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.8 |
30 Apr 2026, 17:11
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-04-30 11:16
Updated : 2026-05-06 19:44
NVD link : CVE-2026-31786
Mitre link : CVE-2026-31786
CVE.ORG link : CVE-2026-31786
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-787
Out-of-bounds Write