CVE-2021-28701

Katalog CVE

CVSS 7.8 · High EPSS 0,27%

Kerentanan Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') pada xen, debian linux +1 lainnya. Skor CVSS 3.1 7.8 (High) menurut NVD.

Deskripsi (NVD)

Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.

Rincian

Terbit di NVD

8 September 2021

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

7.8 (High), sumber NVD
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

EPSS (30 hari)

0,27% peluang dieksploitasi; lebih tinggi dari 17,1% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• http://xenbits.xen.org/xsa/advisory-384.html advisory vendor
• https://xenbits.xenproject.org/xsa/advisory-384.txt advisory vendor
• http://www.openwall.com/lists/oss-security/2021/09/08/2 mailing list · advisory pihak ketiga
• https://security.gentoo.org/glsa/202208-23 advisory pihak ketiga
• https://www.debian.org/security/2021/dsa-4977 advisory pihak ketiga
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3HEHUIUWSSMCQ...
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEHZLIR5DFYYQ...
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L4MI3MQAPGILC...