Vulnerability Database

320,116

Total vulnerabilities in the database

CVE-2024-35791

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

KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region()

Do the cache flush of converted pages in svm_register_enc_region() before dropping kvm->lock to fix use-after-free issues where region and/or its array of pages could be freed by a different task, e.g. if userspace has __unregister_enc_region_locked() already queued up for the region.

Note, the "obvious" alternative of using local variables doesn't fully resolve the bug, as region->pages is also dynamically allocated. I.e. the region structure itself would be fine, but region->pages could be freed.

Flushing multiple pages under kvm->lock is unfortunate, but the entire flow is a rare slow path, and the manual flush is only needed on CPUs that lack coherency for encrypted memory.

  • Published: May 17, 2024
  • Updated: Dec 24, 2025
  • CVE: CVE-2024-35791
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 7.8
  • AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWEs:

Software From Fixed in
linux / linux_kernel 4.19.176 4.20
linux / linux_kernel 5.4.98 5.5
linux / linux_kernel 5.10.15 5.10.215
linux / linux_kernel 5.11.1 5.15.154
linux / linux_kernel 5.16 6.1.84
linux / linux_kernel 6.2 6.6.24
linux / linux_kernel 6.7 6.7.12
linux / linux_kernel 5.11 5.11.x
linux / linux_kernel 5.11-rc7 5.11-rc7.x
linux / linux_kernel 6.8-rc1 6.8-rc1.x
linux / linux_kernel 6.8-rc2 6.8-rc2.x
linux / linux_kernel 6.8-rc3 6.8-rc3.x
linux / linux_kernel 6.8-rc4 6.8-rc4.x
linux / linux_kernel 6.8-rc5 6.8-rc5.x
linux / linux_kernel 6.8-rc6 6.8-rc6.x
linux / linux_kernel 6.8-rc7 6.8-rc7.x
debian / debian_linux 10.0 10.0.x