CVE-2023-52639 KVM: s390: vsie: fix race during shadow creation

2024-04-0314:54:47

Linux

www.cve.org

linux kernel

kvm

s390

vsie

shadow creation

race fix

gmap

private field

7.5 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

15.7%

JSON

In the Linux kernel, the following vulnerability has been resolved:

KVM: s390: vsie: fix race during shadow creation

Right now it is possible to see gmap->private being zero in
kvm_s390_vsie_gmap_notifier resulting in a crash. This is due to the
fact that we add gmap->private == kvm after creation:

static int acquire_gmap_shadow(struct kvm_vcpu *vcpu,
struct vsie_page *vsie_page)
{
[…]
gmap = gmap_shadow(vcpu->arch.gmap, asce, edat);
if (IS_ERR(gmap))
return PTR_ERR(gmap);
gmap->private = vcpu->kvm;

Let children inherit the private field of the parent.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "arch/s390/kvm/vsie.c",
      "arch/s390/mm/gmap.c"
    ],
    "versions": [
      {
        "version": "a3508fbe9dc6",
        "lessThan": "5df3b81a567e",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "a3508fbe9dc6",
        "lessThan": "f5572c0323cf",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "a3508fbe9dc6",
        "lessThan": "28bb27824f25",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "a3508fbe9dc6",
        "lessThan": "fe752331d4b3",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "arch/s390/kvm/vsie.c",
      "arch/s390/mm/gmap.c"
    ],
    "versions": [
      {
        "version": "4.8",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.8",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.82",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.22",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.7.6",
        "lessThanOrEqual": "6.7.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]