by Kastro
Paper/Archive/CVE-2024-36909

CVE-2024-36909

Linux Linux — Drivers: hv: vmbus: Don't free ring buffers that couldn't be re-encrypted

EPSS 0.2%CVSS 9.3
critical.is priorityof 100
31
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 15.3.153 × 203.1No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

In the Linux kernel, the following vulnerability has been resolved: Drivers: hv: vmbus: Don't free ring buffers that couldn't be re-encrypted In CoCo VMs it is possible for the untrusted host to cause set_memory_encrypted() or set_memory_decrypted() to fail such that an error is returned and the resulting memory is shared. Callers need to take care to handle these errors to avoid returning decrypted (shared) memory to the page allocator, which could lead to functional or security issues. The VMBus ring buffer code could free decrypted/shared pages if set_memory_decrypted() fails. Check the decrypted field in the struct vmbus_gpadl for the ring buffers to decide whether to free the memory.

Affected

ProductAffectedFixed inSource
Linuxd4dccf353db80e209f262e3973c834e6e48ba9a9 – < 2f622008bf784a9f5dd17baa19223cc2ac30a0392f622008bf784a9f5dd17baa19223cc2ac30a039CNA
Linuxd4dccf353db80e209f262e3973c834e6e48ba9a9 – < 82f9e213b124a7d2bb5b16ea35d570260ef467e082f9e213b124a7d2bb5b16ea35d570260ef467e0CNA
Linuxd4dccf353db80e209f262e3973c834e6e48ba9a9 – < a9212a4e2963a7fbe3864ba33dc551d4ad8d0abba9212a4e2963a7fbe3864ba33dc551d4ad8d0abbCNA
Linuxd4dccf353db80e209f262e3973c834e6e48ba9a9 – < 30d18df6567be09c1433e81993e35e3da573ac4830d18df6567be09c1433e81993e35e3da573ac48CNA
Linux5.16–CNA

Scores by source

Linux (CNA)9.3CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refgit.kernel.org/stable/c/2f622008bf784a9f5dd17baa19223cc2ac30a039refgit.kernel.org/stable/c/82f9e213b124a7d2bb5b16ea35d570260ef467e0refgit.kernel.org/stable/c/a9212a4e2963a7fbe3864ba33dc551d4ad8d0abbrefgit.kernel.org/stable/c/30d18df6567be09c1433e81993e35e3da573ac48