what you don't know can hurt you
Home Files News &[SERVICES_TAB]About Contact Add New
Showing 1 - 2 of 2 RSS Feed

CVE-2022-26364

Status Candidate

Overview

x86 pv: Insufficient care with non-coherent mappings T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Xen maintains a type reference count for pages, in addition to a regular reference count. This scheme is used to maintain invariants required for Xen's safety, e.g. PV guests may not have direct writeable access to pagetables; updates need auditing by Xen. Unfortunately, Xen's safety logic doesn't account for CPU-induced cache non-coherency; cases where the CPU can cause the content of the cache to be different to the content in main memory. In such cases, Xen's safety logic can incorrectly conclude that the contents of a page is safe.

Related Files

Debian Security Advisory 5184-1
Posted Jul 28, 2022
Authored by Debian | Site debian.org

Debian Linux Security Advisory 5184-1 - Multiple vulnerabilities have been discovered in the Xen hypervisor, which could result in privilege escalation. In addition this updates provides mitigations for the "Retbleed" speculative execution attack and the "MMIO stale data" vulnerabilities.

tags | advisory, vulnerability
systems | linux, debian
advisories | CVE-2022-21123, CVE-2022-21125, CVE-2022-21166, CVE-2022-23816, CVE-2022-23825, CVE-2022-26362, CVE-2022-26363, CVE-2022-26364, CVE-2022-29900
SHA-256 | a6ef7fc52f33a44647f11ad73447e266d15867256950bda60e55581335321822
Xen PV Guest Non-SELFSNOOP CPU Memory Corruption
Posted Jul 6, 2022
Authored by Jann Horn, Google Security Research

On CPUs without SELFSNOOP support, a Xen PV domain that has access to a PCI device (which grants the domain the ability to set arbitrary cache attributes on all its pages) can trick Xen into validating an L2 pagetable that contains a cacheline that is marked as clean in the cache but actually differs from main memory. After the pagetable has been validated, an attacker can flush the "clean" cacheline, such that on the next load, unvalidated data from main memory shows up in the pagetable.

tags | exploit, arbitrary
advisories | CVE-2022-26364
SHA-256 | 0ca3bec4eaa9cefc4bd68628da583653303fb2bb08f1b14700118565ff032f9c
Page 1 of 1
Back1Next

File Archive:

April 2024

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Apr 1st
    10 Files
  • 2
    Apr 2nd
    26 Files
  • 3
    Apr 3rd
    40 Files
  • 4
    Apr 4th
    6 Files
  • 5
    Apr 5th
    26 Files
  • 6
    Apr 6th
    0 Files
  • 7
    Apr 7th
    0 Files
  • 8
    Apr 8th
    22 Files
  • 9
    Apr 9th
    14 Files
  • 10
    Apr 10th
    10 Files
  • 11
    Apr 11th
    13 Files
  • 12
    Apr 12th
    14 Files
  • 13
    Apr 13th
    0 Files
  • 14
    Apr 14th
    0 Files
  • 15
    Apr 15th
    30 Files
  • 16
    Apr 16th
    10 Files
  • 17
    Apr 17th
    22 Files
  • 18
    Apr 18th
    45 Files
  • 19
    Apr 19th
    8 Files
  • 20
    Apr 20th
    0 Files
  • 21
    Apr 21st
    0 Files
  • 22
    Apr 22nd
    11 Files
  • 23
    Apr 23rd
    68 Files
  • 24
    Apr 24th
    23 Files
  • 25
    Apr 25th
    0 Files
  • 26
    Apr 26th
    0 Files
  • 27
    Apr 27th
    0 Files
  • 28
    Apr 28th
    0 Files
  • 29
    Apr 29th
    0 Files
  • 30
    Apr 30th
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close