جزئیات آسیب‌پذیری
CVE-2026-31786
Buffer overflow in drivers/xen/sys-hypervisor.c
شرح رسمی (انگلیسی)
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
امتیازهای CVSS
| امتیاز | نسخه | منبع | بردار |
|---|---|---|---|
| 7.8بالا | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
محصولات آسیب‌پذیر
| فروشنده | محصول | نسخه‌ها | منبع |
|---|---|---|---|
| Linux | Linux | 4.13 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 84b7625728ea311ea35bdaa0eded53c1c56baeaa ≤ v < 8288d031a01dbacfde3fc643f7be3d23504de64d | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 84b7625728ea311ea35bdaa0eded53c1c56baeaa ≤ v < f458ba102da97fafca106327086fc95f3fc764cb | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 84b7625728ea311ea35bdaa0eded53c1c56baeaa ≤ v < 4b4defd2fce3f966c25adabf46644a85558f1169 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 84b7625728ea311ea35bdaa0eded53c1c56baeaa ≤ v < e3af585e1728c917682b6a3de9a69b41fb9194d4 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 84b7625728ea311ea35bdaa0eded53c1c56baeaa ≤ v < d5f59216650c51e5e3fcb7517c825bc8047f60ef | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 84b7625728ea311ea35bdaa0eded53c1c56baeaa ≤ v < 52cecff98bda2c51eed1c6ce9d21c5d6268fb19d | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 84b7625728ea311ea35bdaa0eded53c1c56baeaa ≤ v < 27fdbab4221b375de54bf91919798d88520c6e28 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 84b7625728ea311ea35bdaa0eded53c1c56baeaa ≤ v < 5c5ff7c7bd15bb536f44b10b3fb5b8408f344d0a | CVEProject cvelistV5 (CNA) |
منابع و راهنماها
۱۰- 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
اطلاعات
- تاریخ انتشار
- ۱۴۰۵/۰۲/۱۰
- آخرین به‌روزرسانی
- ۱۴۰۵/۰۷/۲۷
- وضعیت
- منتشرشده
- صادرکننده (CNA)
- Linux
پیش‌بینی بهره‌برداری (EPSS)
ارزیابی SSVC (CISA)
- قابل خودکارسازی
- خیر
- وضعیت بهره‌برداری
- ندارد
- اثر فنی
- کامل
ضعف‌ها (CWE)
- CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')